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Cheap flights from Illinois to London Heathrow Airport from £196

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 5/5. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LHR
13 Mar — 20 Mar1
1 adult

Cheap flight deals from Illinois to Heathrow

Keep the following information in mind while searching for Illinois to Heathrow flight deals. Data was last updated 8 March 2025.

Round-trip from

£454

One-way from

£196

Popular in

June

Cheapest in

February

Average price

£554

Good round-trip deal

£491 or less

Good one-way deal

£315 or less
TAP AIR PORTUGAL
  • TAP AIR PORTUGAL
  • 2/4-29/4
  • 2 total stops
  • 49h 15m total
  • Illinois to London
Search Deals
5/5
  • 5/5
  • 2 total stops
  • 24h 00m total
  • Illinois to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£108 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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.
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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 8 March 2025.

Thu 25/922:35ORD - LHR
Nonstop7h 40mIberia
Tue 7/1012:15LHR - ORD
Nonstop8h 35mIberia
Deal found 7/3£454
Sun 30/318:00ORD - LHR
1 stop34h 20mTAP AIR PORTUGAL
Tue 8/418:45LHR - ORD
1 stop27h 25mTAP AIR PORTUGAL
Deal found 7/3£457
Tue 1/419:30ORD - LHR
1 stop18h 50mIcelandair
Tue 29/421:25LHR - ORD
1 stop26h 55mIcelandair
Deal found 7/3£458
Tue 15/415:45ORD - LHR
1 stop11h 20mAer Lingus
Tue 20/513:25LHR - ORD
1 stop11h 35mAer Lingus
Deal found 7/3£462
Tue 1/421:15ORD - LHR
Nonstop7h 45mBritish Airways
Tue 29/413:10LHR - ORD
Nonstop8h 45mBritish Airways
Deal found 7/3£463
Sun 6/419:15ORD - LHR
2 stops15h 10mScandinavian Airlines
Sun 13/421:05LHR - ORD
2 stops25h 05mScandinavian Airlines
Deal found 8/3£465
Wed 2/411:30ORD - LHR
1 stop13h 00mMultiple Airlines
Mon 7/417:10LHR - ORD
1 stop25h 00mMultiple Airlines
Deal found 7/3£472
Sun 30/311:35ORD - LHR
1 stop12h 55mAir Canada
Tue 8/409:30LHR - ORD
1 stop11h 25mAir Canada
Deal found 8/3£473
Sun 30/312:51MDW - LHR
1 stop11h 54mVirgin Atlantic
Tue 8/412:25LHR - MDW
1 stop11h 53mVirgin Atlantic
Deal found 7/3£477
Tue 1/416:05ORD - LHR
Nonstop8h 15mUnited Airlines
Tue 29/413:45LHR - ORD
1 stop32h 10mUnited Airlines
Deal found 6/3£479
Tue 1/414:40ORD - LHR
1 stop11h 25mDelta
Wed 9/409:55LHR - ORD
1 stop10h 45mDelta
Deal found 7/3£491
Thu 27/313:00ORD - LHR
1 stop11h 55mJetBlue
Tue 1/408:25LHR - ORD
1 stop16h 50mJetBlue
Deal found 7/3£497

Find flights from Illinois to Heathrow within your budget

Customise your flight search to find flights from Illinois to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 8 March 2025.

Fly from

Illinois

Fly to

Heathrow

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 2/4

18:00-22:55

1 stop22h 55m

London Heathrow

Tue 29/4

19:50-16:10

1 stop26h 20m

£454

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 15/4

17:45-07:20

Nonstop7h 35m

London Heathrow

Tue 20/5

14:25-17:00

Nonstop8h 35m

£455

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 1/4

19:30-20:20

1 stop18h 50m

London Heathrow

Tue 29/4

21:25-18:20

1 stop26h 55m

£458

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 15/4

15:45-09:05

1 stop11h 20m

London Heathrow

Tue 20/5

13:25-19:00

1 stop11h 35m

£462

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 1/4

21:15-11:00

Nonstop7h 45m

London Heathrow

Tue 29/4

13:10-15:55

Nonstop8h 45m

£463

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 6/4

19:15-16:25

2 stops15h 10m

London Heathrow

Sun 13/4

21:05-16:10

2 stops25h 05m

£465

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 2/4

11:30-06:30

1 stop13h 00m

London Heathrow

Wed 9/4

06:00-15:55

1 stop15h 55m

£472

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 30/3

11:35-06:30

1 stop12h 55m

London Heathrow

Tue 8/4

09:30-14:55

1 stop11h 25m

£473

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Sun 30/3

12:51-06:45

1 stop11h 54m

London Heathrow

Tue 8/4

12:25-18:18

1 stop11h 53m

£477

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 1/4

16:05-06:20

Nonstop8h 15m

London Heathrow

Tue 29/4

13:45-15:55

1 stop32h 10m

£479

Flights are sorted by cheapest return flights first.

Deals found on 8/3

Showing 1-10 of 60 results
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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 £164). 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?

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 8 March 2025.

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.

Rainfall in Heathrow by month

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

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

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 8 March 2025.
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
8,024 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

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
8,024 reviews
Delta
8.0
Very Good
8,024 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

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
1,322 reviews
Delta
8.0
Very Good
8,024 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

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
1,271 reviews
Delta
8.0
Very Good
8,024 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

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
765 reviews
Delta
8.0
Very Good
8,024 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

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
1,566 reviews
Delta
8.0
Very Good
8,024 reviews
Check prices

Comfort

8.0

Food

7.3

Overall

8.0

Crew

8.5

Boarding

8.2

Entertainment

7.9

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

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?

    The cheapest airline one-way is Icelandair, with whom users have recently found tickets for as low as £201. However, be on the lookout for offers from JetBlue and TAP AIR PORTUGAL, 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 (81%), American Airlines (74%) or Alaska Airlines (74%) 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 £2,594 for a flight from Illinois to London Heathrow Airport. The cheapest flight overall is £288 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at £356.

  • 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 £164). 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

Travelling to a place near Illinois?

Book flights to Illinois if you plan to visit one of these locations
Hounslow
Deal
Milton Keynes
Gatwick
Croydon
Luton
Slough
Hayes
Ilford
Eastbourne
Swindon
Northampton
Southend-on-Sea
Crawley
Ipswich
Maidstone
Winchester
Wembley
Southall
Watford

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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.
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Top 6 airlines flying from Illinois to Heathrow

Discover the top 6 airlines that operate flights from Illinois to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 8 March 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£315Average£839FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
FinnairCheapest£370Average£730FlexibilityNo cancel feeOn-time76%
Search Finnair flights
American AirlinesCheapest£397Average£813FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
IberiaCheapest£464Average£660FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£495Average£677FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£516Average£710FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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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