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Cheap flights from Illinois to London from £203

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 12/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
3 Apr — 10 Apr1
1 adult

Cheap flight deals from Illinois to London

Keep the following information in mind while searching for Illinois to London flight deals. Data was last updated 29 March 2025.

Round-trip from

£457

One-way from

£203

Popular in

June

Cheapest in

February

Average price

£548

Good round-trip deal

£531 or less

Good one-way deal

£316 or less
Icelandair
  • Icelandair
  • 25/4-2/5
  • 2 total stops
  • 42h 55m total
  • Illinois to London
Search Deals
12/4
  • 12/4
  • 1 total stop
  • 15h 02m total
  • Illinois to London
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£102 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 (LON).
Search Deals
Price to beat on a one-way flight from Illinois to London (LON).
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Find flight deals from Illinois to London

Cheapest flights from Illinois to London
Explore the most affordable flight options available from Illinois to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 March 2025.

Wed 8/1018:00ORD - LHR
1 stop17h 45mTAP AIR PORTUGAL
Wed 22/1008:00LHR - ORD
1 stop14h 10mTAP AIR PORTUGAL
Deal found 27/3£457
Wed 19/1118:30ORD - LGW
1 stop10h 25mIcelandair
Mon 24/1111:55LGW - ORD
1 stop11h 25mIcelandair
Deal found 27/3£457
Sat 23/819:15ORD - LHR
1 stop16h 25mScandinavian Airlines
Mon 1/910:20LHR - ORD
1 stop11h 50mScandinavian Airlines
Deal found 27/3£457
Thu 1/519:00ORD - LGW
1 stop29h 55mMultiple Airlines
Thu 8/514:00LGW - ORD
1 stop15h 29mMultiple Airlines
Deal found 26/3£459
Fri 25/422:15ORD - LHR
1 stop16h 05mIcelandair
Sun 27/421:25LHR - ORD
1 stop26h 50mIcelandair
Deal found 27/3£460
Tue 22/411:30ORD - LHR
1 stop13h 00mAir Canada
Tue 29/409:30LHR - ORD
1 stop11h 25mAir Canada
Deal found 27/3£469
Thu 1/515:45ORD - LHR
1 stop11h 20mAer Lingus
Thu 8/512:00LHR - ORD
1 stop13h 00mAer Lingus
Deal found 27/3£475
Sun 4/519:15ORD - STN
2 stops21h 25mMultiple Airlines
Mon 19/506:15STN - ORD
2 stops15h 55mMultiple Airlines
Deal found 28/3£476
Tue 1/416:40MDW - LGW
1 stop35h 20mMultiple Airlines
Tue 29/414:00LGW - MDW
2 stops31h 13mMultiple Airlines
Deal found 28/3£478
Mon 21/422:20ORD - LHR
Nonstop7h 55mFinnair
Tue 29/410:20LHR - ORD
1 stop13h 30mFinnair
Deal found 27/3£490
Mon 20/1013:35ORD - LHR
1 stop13h 55mJetBlue
Tue 28/1008:25LHR - ORD
1 stop14h 02mJetBlue
Deal found 27/3£497
Mon 21/416:00ORD - LHR
1 stop13h 50mMultiple Airlines
Tue 29/406:00LHR - ORD
1 stop12h 10mMultiple Airlines
Deal found 28/3£497

Cheapflights Fare Finder

Customise your flight search to find flights from Illinois to London 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 29 March 2025.
Use the filters below to find and compare flights from Illinois to London that are best for you.

Fly from

Illinois

Fly to

London

Route

Depart

Return

Price

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 25/4

22:15-20:20

1 stop16h 05m

London Heathrow

Fri 2/5

21:25-18:15

1 stop26h 50m

£457

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sat 23/8

19:15-17:40

1 stop16h 25m

London Heathrow

Mon 1/9

10:20-16:10

1 stop11h 50m

£457

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 28/4

05:55-06:20

1 stop18h 25m

London Gatwick

Sat 3/5

14:00-08:04

1 stop24h 04m

£459

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Fri 25/4

22:15-14:40

1 stop10h 25m

London Gatwick

Tue 6/5

13:00-18:15

1 stop11h 15m

£461

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 22/4

11:30-06:30

1 stop13h 00m

London Heathrow

Tue 29/4

09:30-14:55

1 stop11h 25m

£469

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 27/4

18:00-11:20

2 stops35h 20m

London Gatwick

Tue 29/4

16:25-16:10

1 stop29h 45m

£470

ChicagoLondon

MDW - LGW

MDWLGW

Chicago Midway

Thu 1/5

13:19-10:00

1 stop14h 41m

London Gatwick

Thu 8/5

14:00-12:24

1 stop28h 24m

£470

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 1/5

15:45-09:05

1 stop11h 20m

London Heathrow

Thu 8/5

12:00-19:00

1 stop13h 00m

£475

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Sun 4/5

19:15-23:59

3 stops22h 44m

London Stansted

Wed 14/5

13:30-16:10

2 stops32h 40m

£476

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 21/4

22:20-12:15

Nonstop7h 55m

London Heathrow

Tue 29/4

10:20-17:50

1 stop13h 30m

£490

Flights are sorted by cheapest return flights first.

Deals found on 27/3

Showing 1-10 of 60 results
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Best time to book a flight from Illinois to London

Have a flexible travel schedule? Discover the best time to fly to London 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.

Cheapflights Insights

Everything you need to know about your flight from Illinois to London

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

Currently, January is the cheapest month in which you can book a flight from Illinois to London (average of £112). Flying from Illinois to London 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 LON?

Find hourly flight availability from Illinois to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 March 2025.

When flying from Illinois to London, 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 London by month

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

In terms of precipitation, rainfall in London 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 when rainfall is around 40.0 mm.

Temperature in London by month

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

If weather is an important factor for your trip to London, 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 London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated 29 March 2025.
See what other customers who have flown with Delta, Porter Airlines and KLM from Illinois to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,895 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Comfort

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
7,895 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Comfort

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.
Porter Airlines
7.9
Good
277 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Comfort

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
1,321 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Comfort

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.
Air Transat
7.8
Good
381 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Comfort

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
1,267 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Overall

8.0

Crew

8.5

Food

7.3

Comfort

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 London. 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 one-way?

    £205 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on TAP AIR PORTUGAL and JetBlue, with prices starting from £206 and £250, respectively.

  • What are the most popular routes from Illinois to London?

    When deciding which route to take from Illinois to London consider Chicago O'Hare Intl - London Heathrow, Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City as they are the most popular.

  • What are the most reliable airlines from Illinois to London?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Illinois to London on time: Royal Jordanian (87%), Air Canada (80%), Austrian Airlines (80%).

  • What are the cheapest flights from Illinois to London?

    Looking for the cheapest flight from Illinois to London? While on average our users pay £3,167, our data indicates the cheapest price to be £286. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £349.

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

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

  • How can I find direct flights from Illinois to London?

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

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

    Yes. Cheapflights offers flight deals from Illinois to London 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?

    Currently, January is the cheapest month in which you can book a flight from Illinois to London (average of £112). Flying from Illinois to London 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
Eastbourne
Wembley
Hayes
Ilford
Crawley
Southend-on-Sea
Winchester
Maidstone
Ipswich
Watford
Southall
Dartford
Folkestone

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Illinois to London

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 London

Discover the top 6 airlines that operate flights from Illinois to London. 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 29 March 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£369Average£716FlexibilityNo cancel feeOn-time76%
Search Finnair flights
American AirlinesCheapest£396Average£776FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
IberiaCheapest£463Average£645FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£493Average£673FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£502Average£858FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£514Average£708FlexibilityNo 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 London?

Cheapflights helps you search for flights from Illinois to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Illinois to London for you. Better yet — we are completely free to use.

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

Certainly. Search results for flights to London from Illinois shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights offers price alerts on Illinois to London 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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