What are the cheapest airlines to fly from Illinois to London Heathrow Airport one-way?

The cheapest airline one-way is Icelandair, with whom users have recently found tickets for as low as £212. However, be on the lookout for offers from JetBlue and WestJet, as they are both options that can get you from Illinois to London Heathrow Airport for a low price.

What are the most popular routes from Illinois to London Heathrow Airport?

The most popular route from Illinois to London Heathrow Airport is Chicago O'Hare Intl - London Heathrow. You may also consider Chicago Midway - London Heathrow or Lambert-St Louis - London Heathrow.

What are the cheapest flights from Illinois to London Heathrow Airport?

On average you can expect to pay £3,265 for a flight from Illinois to London Heathrow Airport. The cheapest flight overall is £315 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £403.

What are the most reliable airlines from Illinois to London Heathrow Airport?

No one likes to see their flight delayed. When booking a flight from Illinois to London Heathrow Airport consider choosing Aer Lingus (79%), American Airlines (71%) or Alaska Airlines (71%) as they are the most reliable in getting you off to your destination on time.

What are the most popular airlines that fly from Illinois to London Heathrow Airport?

Consider American Airlines, Finnair or British Airways when booking your flight. These represent the most popular airlines when flying from Illinois to London Heathrow Airport.

How far in advance should I book a flight from Illinois to London Heathrow Airport?

To save on the cost of your flight from Illinois to London Heathrow Airport, book at least 56 days before your planned departure. Booking around this time can save you about 16% on the cost of this flight compared to booking a flight leaving this week. We have found prices from £588 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as £674.

What is the cheapest month to fly from Illinois to London Heathrow Airport?

February is one of the best times of the year to fly to London Heathrow Airport from Illinois. Prices for February average £609 per person but you can even find prices for as low as £357. The most expensive prices can be found in the month of June. Opting for a February flight can save you 37% on your journey compared to booking in June

Can I find deals for flights from Illinois to Heathrow that include hotel bookings?

Yes. In addition to deals on Illinois to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

How can I find direct flights from Illinois to Heathrow?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Heathrow.

Can I find deals for business class flights from Illinois to Heathrow?

Yes. Cheapflights offers flight deals from Illinois to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

£212+ Flights from Illinois to London Heathrow Airport

Cheap flight deals from Illinois to Heathrow

Round-trip from	£472
One-way from	£212
Popular in	June
Cheapest in	February
Average price	£511
Good round-trip deal	£499 or less
Good one-way deal	£367 or less

Scandinavian Airlines
2/3-12/3
3 total stops
42h 20m total
Illinois to London

Search Deals

Icelandair
9/2
1 total stop
10h 20m total
Illinois to London

Search Deals

Highest demand for flights based on searches. 19% potential increase in price (£115 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£18 potential savings vs. average return price).

Search Deals

Average for round-trip flights in February 2025

Search Deals

Price to beat on a round-trip flight from Illinois to London Heathrow.

Search Deals

Price to beat on a one-way flight from Illinois to London Heathrow.

Search Deals

Find flight deals from Illinois to Heathrow

Cheapest flights from Illinois to Heathrow
Explore the most affordable flight options available from Illinois to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 February 2025.

Mon 10/219:40ORD - LHR

2 stops14h 45mScandinavian Airlines

Mon 17/210:20LHR - ORD

1 stop13h 30mScandinavian Airlines

Deal found 4/2£472

Tue 4/321:45ORD - LHR

Nonstop7h 45mIberia

Tue 11/306:10LHR - ORD

1 stop14h 20mIberia

Deal found 4/2£473

Sun 2/321:45ORD - LHR

Nonstop7h 45mBritish Airways

Tue 11/311:00LHR - ORD

Nonstop8h 55mBritish Airways

Deal found 4/2£473

Wed 5/218:30ORD - LHR

1 stop19h 00mIcelandair

Tue 11/220:40LHR - ORD

1 stop26h 40mIcelandair

Deal found 3/2£475

Tue 4/307:25MDW - LHR

1 stop17h 25mMultiple Airlines

Tue 11/307:35LHR - MDW

2 stops38h 48mMultiple Airlines

Deal found 4/2£475

Tue 4/305:15ORD - LHR

2 stops23h 35mMultiple Airlines

Tue 18/312:15LHR - ORD

2 stops24h 19mMultiple Airlines

Deal found 4/2£481

Sun 16/220:25ORD - LHR

1 stop20h 15mTAP AIR PORTUGAL

Tue 18/218:30LHR - ORD

1 stop27h 00mTAP AIR PORTUGAL

Deal found 4/2£485

Tue 4/314:08MDW - LHR

1 stop10h 42mVirgin Atlantic

Tue 11/309:10LHR - MDW

1 stop14h 08mVirgin Atlantic

Deal found 4/2£494

Sun 2/316:14ORD - LHR

1 stop10h 21mFinnair

Tue 11/311:00LHR - ORD

Nonstop8h 55mFinnair

Deal found 4/2£497

Mon 3/312:15ORD - LHR

1 stop12h 50mDelta

Wed 12/308:40LHR - ORD

1 stop11h 50mDelta

Deal found 4/2£498

Sun 2/311:35ORD - LHR

1 stop13h 35mAir Canada

Tue 11/308:55LHR - ORD

2 stops15h 42mAir Canada

Deal found 4/2£504

Tue 11/221:00ORD - LHR

1 stop12h 35mAer Lingus

Tue 18/208:50LHR - ORD

1 stop16h 25mAer Lingus

Deal found 4/2£505

Best flights from Illinois to Heathrow
Discover carefully curated flight deals from Illinois to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 5 February 2025.

Sun 2/319:40ORD - LHR

1 stop14h 20mScandinavian Airlines

Wed 12/319:50LHR - ORD

2 stops28h 00mScandinavian Airlines

Deal found 4/2£472

Tue 4/321:45ORD - LHR

Nonstop7h 45mIberia

Tue 11/306:10LHR - ORD

1 stop14h 20mIberia

Deal found 4/2£473

Sun 2/321:45ORD - LHR

Nonstop7h 45mBritish Airways

Tue 11/311:00LHR - ORD

Nonstop8h 55mBritish Airways

Deal found 4/2£473

Tue 4/307:25MDW - LHR

1 stop17h 25mMultiple Airlines

Tue 11/307:35LHR - MDW

2 stops38h 48mMultiple Airlines

Deal found 4/2£475

Fri 25/422:15ORD - LHR

1 stop16h 05mIcelandair

Tue 29/413:05LHR - ORD

1 stop11h 15mIcelandair

Deal found 4/2£477

Sun 16/220:25ORD - LHR

1 stop20h 15mTAP AIR PORTUGAL

Tue 18/218:30LHR - ORD

1 stop27h 00mTAP AIR PORTUGAL

Deal found 4/2£485

Tue 4/314:08MDW - LHR

1 stop10h 42mVirgin Atlantic

Tue 11/309:10LHR - MDW

1 stop14h 08mVirgin Atlantic

Deal found 4/2£494

Sun 2/316:14ORD - LHR

1 stop10h 21mFinnair

Tue 11/311:00LHR - ORD

Nonstop8h 55mFinnair

Deal found 4/2£497

Mon 3/312:15ORD - LHR

1 stop12h 50mDelta

Wed 12/308:40LHR - ORD

1 stop11h 50mDelta

Deal found 4/2£498

Sun 2/311:35ORD - LHR

1 stop13h 35mAir Canada

Tue 11/308:55LHR - ORD

2 stops15h 42mAir Canada

Deal found 4/2£504

Sun 2/317:18ORD - LHR

1 stop10h 02mAmerican Airlines

Tue 11/311:00LHR - ORD

Nonstop8h 55mAmerican Airlines

Deal found 4/2£505

Mon 3/314:08MDW - LHR

1 stop10h 42mKLM

Tue 11/309:10LHR - MDW

1 stop14h 08mKLM

Deal found 4/2£505

Direct flights from Illinois to Heathrow
Explore direct flight options from Illinois to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 5 February 2025.

Tue 22/422:20ORD - LHR

Nonstop7h 55mIberia

Tue 29/409:20LHR - ORD

Nonstop8h 30mIberia

Deal found 4/2£473

Sun 2/321:45ORD - LHR

Nonstop7h 45mBritish Airways

Tue 11/311:00LHR - ORD

Nonstop8h 55mBritish Airways

Deal found 4/2£473

Sun 2/321:45ORD - LHR

Nonstop7h 45mFinnair

Tue 11/311:00LHR - ORD

Nonstop8h 55mFinnair

Deal found 4/2£486

Mon 24/217:50ORD - LHR

Nonstop8h 05mUnited Airlines

Wed 12/313:35LHR - ORD

Nonstop9h 25mUnited Airlines

Deal found 4/2£534

Wed 12/321:15ORD - LHR

Nonstop7h 45mMultiple Airlines

Fri 21/311:55LHR - ORD

Nonstop8h 50mMultiple Airlines

Deal found 4/2£629

Last-minute flights from Illinois to Heathrow
Discover last-minute flight deals from Illinois to Heathrow. Data last updated 5 February 2025 and is based on user searches.

Wed 5/218:30ORD - LHR

1 stop19h 00mIcelandair

Tue 11/220:40LHR - ORD

1 stop26h 40mIcelandair

Deal found 3/2£475

Sun 9/220:25ORD - LHR

1 stop15h 05mTAP AIR PORTUGAL

Wed 19/206:00LHR - ORD

1 stop15h 30mTAP AIR PORTUGAL

Deal found 4/2£507

Sun 9/207:00ORD - LHR

1 stop16h 55mJetBlue

Thu 13/207:25LHR - ORD

1 stop15h 20mJetBlue

Deal found 4/2£509

Sun 9/211:35ORD - LHR

1 stop13h 35mUnited Airlines

Tue 18/206:30LHR - ORD

2 stops16h 05mUnited Airlines

Deal found 4/2£521

Mon 10/219:40ORD - LHR

2 stops14h 45mScandinavian Airlines

Mon 17/210:20LHR - ORD

1 stop13h 30mScandinavian Airlines

Deal found 4/2£472

Mon 10/221:00ORD - LHR

1 stop10h 25mAer Lingus

Tue 18/209:50LHR - ORD

1 stop15h 25mAer Lingus

Deal found 4/2£493

Mon 10/214:08MDW - LHR

1 stop10h 42mVirgin Atlantic

Tue 18/212:20LHR - MDW

1 stop11h 51mVirgin Atlantic

Deal found 4/2£520

Mon 10/217:05MDW - LHR

1 stop11h 30mDelta

Tue 18/208:40LHR - MDW

2 stops15h 31mDelta

Deal found 4/2£538

Tue 11/218:30ORD - LHR

1 stop10h 20mIcelandair

Thu 20/312:15LHR - ORD

1 stop11h 05mIcelandair

Deal found 3/2£494

Tue 11/207:20ORD - LHR

2 stops19h 10mMultiple Airlines

Tue 25/208:55LHR - ORD

2 stops16h 42mMultiple Airlines

Deal found 3/2£515

Tue 11/218:35ORD - LHR

Nonstop7h 40mFinnair

Wed 19/211:55LHR - ORD

Nonstop8h 50mFinnair

Deal found 4/2£528

Tue 11/209:50ORD - LHR

2 stops15h 20mAir Canada

Tue 18/208:55LHR - ORD

2 stops15h 44mAir Canada

Deal found 4/2£531

One-way flights from Illinois to Heathrow
Search for one-way flight options from Illinois to Heathrow. Find affordable one-way fares based on user searches. Data last updated 5 February 2025.

Sun 9/218:30ORD - LHR

1 stop10h 20mIcelandair

Deal found 3/2£212

Wed 2/410:37ORD - LHR

1 stop13h 53mJetBlue

Deal found 4/2£215

Sun 9/319:42ORD - LHR

3 stops37h 43mMultiple Airlines

Deal found 3/2£223

Thu 6/320:44MDW - LHR

2 stops58h 06mMultiple Airlines

Deal found 4/2£233

Sun 9/316:45ORD - LHR

1 stop15h 05mWestJet

Deal found 3/2£244

Wed 12/219:15ORD - LHR

1 stop20h 20mTAP AIR PORTUGAL

Deal found 4/2£278

Sun 9/219:40ORD - LHR

2 stops17h 10mScandinavian Airlines

Deal found 3/2£289

Sun 9/217:00ORD - LHR

Nonstop7h 50mBritish Airways

Deal found 3/2£298

Wed 12/313:06STL - LHR

2 stops23h 34mScandinavian Airlines

Deal found 4/2£299

Mon 10/209:50ORD - LHR

2 stops15h 20mAir Canada

Deal found 4/2£318

Wed 2/412:51MDW - LHR

1 stop11h 54mVirgin Atlantic

Deal found 4/2£320

Sun 30/316:59MDW - LHR

1 stop12h 11mAir France

Deal found 4/2£327

Find flights from Illinois to Heathrow within your budget

Fly from

Fly to

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 2/3

19:40-16:00

1 stop14h 20m

London Heathrow

Wed 12/3

19:50-18:50

2 stops28h 00m

£472

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 4/3

21:45-11:30

Nonstop7h 45m

London Heathrow

Tue 11/3

06:10-15:30

1 stop14h 20m

£473

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 4/3

07:25-06:50

1 stop17h 25m

London Heathrow

Tue 11/3

07:35-17:23

2 stops38h 48m

£475

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 4/3

21:45-11:30

Nonstop7h 45m

London Heathrow

Tue 11/3

06:10-15:30

1 stop14h 20m

£477

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 25/4

22:15-20:20

1 stop16h 05m

London Heathrow

Tue 29/4

13:05-18:20

1 stop11h 15m

£477

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 4/3

05:15-10:50

2 stops23h 35m

London Heathrow

Tue 18/3

12:15-07:34

2 stops24h 19m

£481

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 16/2

20:25-22:40

1 stop20h 15m

London Heathrow

Thu 20/2

18:30-15:30

1 stop27h 00m

£485

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 4/3

14:08-06:50

1 stop10h 42m

London Heathrow

Tue 11/3

09:10-18:18

1 stop14h 08m

£494

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 2/3

16:14-08:35

1 stop10h 21m

London Heathrow

Tue 11/3

11:00-14:55

Nonstop8h 55m

£497

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 3/3

12:15-07:05

1 stop12h 50m

London Heathrow

Wed 12/3

08:40-15:30

1 stop11h 50m

£498

Flights are sorted by cheapest return flights first.

Deals found on 3/2

Showing 1-10 of 60 results

...

Best time to book a flight from Illinois to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Illinois with our price prediction graph.

Estimated return price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Illinois to Heathrow

Get recent, data-driven insights about flights from Illinois to Heathrow including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Illinois to London Heathrow Airport?

Currently, January is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of £112). Flying from Illinois to London Heathrow Airport in August is currently the most expensive (average of £162). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to LHR?

When flying from Illinois to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Illinois to London Heathrow Airport

The most flights from USIL to LHR are scheduled on a Monday (34 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (28 on average).

Rainfall in Heathrow by month

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

Temperature in Heathrow by month

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

Reviews of airlines servicing Heathrow

To help decide which airline to fly from Illinois to London, see what other customers have to say about Delta, KLM and Finnair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

8,408 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very Good

8,408 reviews

Delta

8.0

Very Good

8,408 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM

7.8

Good

1,334 reviews

Delta

8.0

Very Good

8,408 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair

7.6

Good

1,284 reviews

Delta

8.0

Very Good

8,408 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Austrian Airlines

7.5

Good

785 reviews

Delta

8.0

Very Good

8,408 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

SWISS

7.5

Good

1,582 reviews

Delta

8.0

Very Good

8,408 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

What are the cheapest airlines to fly from Illinois to London Heathrow Airport one-way?
The cheapest airline one-way is Icelandair, with whom users have recently found tickets for as low as £212. However, be on the lookout for offers from JetBlue and WestJet, as they are both options that can get you from Illinois to London Heathrow Airport for a low price.
What are the most popular routes from Illinois to London Heathrow Airport?
The most popular route from Illinois to London Heathrow Airport is Chicago O'Hare Intl - London Heathrow. You may also consider Chicago Midway - London Heathrow or Lambert-St Louis - London Heathrow.
What are the most reliable airlines from Illinois to London Heathrow Airport?
No one likes to see their flight delayed. When booking a flight from Illinois to London Heathrow Airport consider choosing Aer Lingus (79%), American Airlines (71%) or Alaska Airlines (71%) as they are the most reliable in getting you off to your destination on time.
What are the cheapest flights from Illinois to London Heathrow Airport?
On average you can expect to pay £3,265 for a flight from Illinois to London Heathrow Airport. The cheapest flight overall is £315 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £403.
Can I find deals for flights from Illinois to Heathrow that include hotel bookings?
Yes. In addition to deals on Illinois to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Illinois to Heathrow?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Heathrow.
Can I find deals for business class flights from Illinois to Heathrow?
Yes. Cheapflights offers flight deals from Illinois to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Illinois to London Heathrow Airport?
Currently, January is the cheapest month in which you can book a flight from Illinois to London Heathrow Airport (average of £112). Flying from Illinois to London Heathrow Airport in August is currently the most expensive (average of £162). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Deal

Hounslow

Gatwick

Milton Keynes

Croydon

Slough

Luton

Ilford

Hayes

Eastbourne

Northampton

Swindon

Southend-on-Sea

Wembley

Ipswich

Maidstone

Winchester

Crawley

Watford

Stansted

Browse thousands of different options on Cheapflights for your next trip

Top 6 airlines flying from Illinois to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
Lufthansa	Cheapest£327	Average£871	FlexibilityNo cancel fee	On-time76%	Search Lufthansa flights
Finnair	Cheapest£384	Average£745	FlexibilityNo cancel fee	On-time76%	Search Finnair flights
American Airlines	Cheapest£412	Average£807	FlexibilityNo cancel fee	On-time71%	Search American Airlines flights
Iberia	Cheapest£482	Average£677	FlexibilityNo cancel fee	On-time77%	Search Iberia flights
British Airways	Cheapest£512	Average£708	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
United Airlines	Cheapest£535	Average£737	FlexibilityNo cancel fee	On-time69%	Search United Airlines flights

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How does Cheapflights help users find flights from Illinois to Heathrow?

When you search for this flight from Illinois to Heathrow, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Illinois to Heathrow?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Heathrow from Illinois.

Can Cheapflights find flights from Illinois to Heathrow with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Illinois to Heathrow, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Illinois to Heathrow become cheaper?

Yes, Cheapflights offers price alerts on Illinois to Heathrow flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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Cheap flights from Illinois to London Heathrow Airport from £212

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/2. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Illinois to Heathrow

Cheapest flights from Illinois to HeathrowExplore the most affordable flight options available from Illinois to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 February 2025.

Explore the most affordable flight options available from Illinois to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 February 2025.

Find flights from Illinois to Heathrow within your budget

Best time to book a flight from Illinois to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Illinois with our price prediction graph.

Travel insights for flights from Illinois to Heathrow

Get recent, data-driven insights about flights from Illinois to Heathrow including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Illinois to London Heathrow Airport?

What is the cheapest time of day to fly from IL to LHR?

Find hourly flight availability from Illinois to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 5 February 2025.

Weekly flight availability from Illinois to London Heathrow Airport

Explore weekly flight availability from Illinois to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 5 February 2025.

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

Reviews of airlines servicing Heathrow

To help decide which airline to fly from Illinois to London, see what other customers have to say about Delta, KLM and Finnair. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines to fly from Illinois to London Heathrow Airport one-way?

What are the most popular routes from Illinois to London Heathrow Airport?

What are the most reliable airlines from Illinois to London Heathrow Airport?

What are the cheapest flights from Illinois to London Heathrow Airport?

Can I find deals for flights from Illinois to Heathrow that include hotel bookings?

How can I find direct flights from Illinois to Heathrow?

Can I find deals for business class flights from Illinois to Heathrow?

What is the cheapest month to book a flight from Illinois to London Heathrow Airport?

Travelling to a place near Illinois?

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Alternative routes for Illinois to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.

Top 6 airlines flying from Illinois to Heathrow

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How does Cheapflights help users find flights from Illinois to Heathrow?

Why should you use Cheapflights to find cheap flight tickets from Illinois to Heathrow?

Can Cheapflights find flights from Illinois to Heathrow with no change fees?

Can Cheapflights notify me if prices for flights from Illinois to Heathrow become cheaper?

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Cheapest flights from Illinois to Heathrow
Explore the most affordable flight options available from Illinois to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 5 February 2025.