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Cheap flights from Illinois to London from £169

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 21/7. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — LON
5 May — 12 May1
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 30 April 2025.

Round-trip from

£457

One-way from

£169

Popular in

June

Cheapest in

February

Average price

£501

Good round-trip deal

£506 or less

Good one-way deal

£290 or less
Icelandair
  • Icelandair
  • 3/10-6/10
  • 2 total stops
  • 45h 50m total
  • Illinois to London
Search Deals
21/7
  • 21/7
  • 1 total stop
  • 34h 20m total
  • Illinois to London
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (£86 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 30 April 2025.

Thu 28/819:15ORD - LHR
1 stop17h 15mScandinavian Airlines
Tue 2/915:35LHR - ORD
2 stops54h 35mScandinavian Airlines
Deal found 29/4£457
Fri 3/1019:25ORD - LGW
1 stop13h 15mIcelandair
Mon 6/1015:40LGW - ORD
1 stop32h 35mIcelandair
Deal found 29/4£457
Wed 30/422:20ORD - LHR
Nonstop7h 55mIberia
Tue 6/513:30LHR - ORD
1 stop13h 03mIberia
Deal found 29/4£458
Wed 30/412:48MDW - LHR
2 stops15h 27mDelta
Tue 6/511:30LHR - MDW
2 stops16h 52mDelta
Deal found 29/4£458
Sun 4/522:15ORD - LGW
1 stop31h 30mMultiple Airlines
Tue 13/513:00LGW - ORD
2 stops24h 27mMultiple Airlines
Deal found 29/4£458
Wed 24/919:59ORD - LHR
1 stop11h 11mDelta
Fri 17/1009:40LHR - ORD
1 stop14h 05mDelta
Deal found 29/4£459
Fri 3/1019:25ORD - LHR
1 stop10h 30mIcelandair
Mon 13/1021:25LHR - ORD
1 stop26h 50mIcelandair
Deal found 29/4£460
Mon 11/822:20ORD - LCY
1 stop13h 10mBritish Airways
Mon 18/820:30LCY - ORD
1 stop25h 15mBritish Airways
Deal found 30/4£462
Wed 3/916:55ORD - LHR
Nonstop7h 55mAmerican Airlines
Mon 8/907:40LHR - ORD
1 stop14h 05mAmerican Airlines
Deal found 29/4£462
Sun 4/515:45ORD - LHR
1 stop10h 15mAer Lingus
Tue 13/508:50LHR - ORD
1 stop11h 10mAer Lingus
Deal found 29/4£463
Mon 22/918:10ORD - LGW
2 stops20h 15mTAP AIR PORTUGAL
Tue 21/1016:25LGW - ORD
1 stop29h 45mTAP AIR PORTUGAL
Deal found 29/4£464
Tue 6/513:29ORD - LGW
2 stops12h 41mAmerican Airlines
Tue 13/510:40LGW - ORD
2 stops18h 28mAmerican Airlines
Deal found 29/4£465

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 30 April 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 - LGW

ORDLGW

Chicago O'Hare Intl

Fri 3/10

19:25-14:40

1 stop13h 15m

London Gatwick

Mon 6/10

15:40-18:15

1 stop32h 35m

£457

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Tue 13/5

08:15-06:35

1 stop16h 20m

London Gatwick

Tue 20/5

14:30-08:59

1 stop24h 29m

£459

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 13/5

14:55-08:05

1 stop11h 10m

London Heathrow

Tue 20/5

11:35-17:34

1 stop11h 59m

£459

ChicagoLondon

MDW - LHR

MDWLHR

Chicago Midway

Tue 26/8

13:05-07:15

1 stop12h 10m

London Heathrow

Fri 5/9

11:45-18:28

1 stop12h 43m

£459

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 4/5

15:45-08:00

1 stop10h 15m

London Heathrow

Tue 13/5

08:50-14:00

1 stop11h 10m

£463

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 11/5

11:35-06:35

1 stop13h 00m

London Gatwick

Tue 20/5

10:40-23:56

2 stops19h 16m

£463

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 22/9

18:10-20:25

2 stops20h 15m

London Gatwick

Tue 21/10

16:25-16:10

1 stop29h 45m

£464

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Tue 13/5

13:30-07:15

1 stop11h 45m

London Heathrow

Fri 30/5

09:00-15:00

1 stop12h 00m

£465

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 3/9

13:31-10:00

1 stop14h 29m

London Gatwick

Mon 8/9

12:00-20:51

1 stop14h 51m

£465

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 7/5

22:15-20:20

1 stop16h 05m

London Heathrow

Wed 14/5

13:05-18:15

1 stop11h 10m

£468

Flights are sorted by cheapest return flights first.

Deals found on 30/4

Showing 1-10 of 60 results
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6

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 30 April 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.

Weekly flight availability from Illinois to London

Explore weekly flight availability from Illinois to London. 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 30 April 2025.

The most flights from USIL to LON are scheduled on a Monday (57 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (50 on average).

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 30 April 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
7,934 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

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
7,934 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

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
8.0
Very Good
285 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

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
7,934 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

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
385 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

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
1,275 reviews
Delta
8.0
Very Good
7,934 reviews
Check prices

Food

7.3

Overall

8.0

Boarding

8.2

Comfort

7.9

Entertainment

7.9

Crew

8.5

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?

    £213 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 £213 and £268, 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 (88%), Gulf Air (82%), Malaysia Airlines (79%).

  • What are the cheapest flights from Illinois to London?

    Looking for the cheapest flight from Illinois to London? While on average our users pay £3,036, our data indicates the cheapest price to be £264. The most popular route (Chicago O'Hare Intl - London Heathrow), is priced around £295.

  • 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
Deal
Hounslow
Milton Keynes
Gatwick
Luton
Slough
Croydon
Eastbourne
Ilford
Hayes
Southend-on-Sea
Crawley
Wembley
Ipswich
Maidstone
Winchester
Folkestone
Dartford
Watford
Chichester

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 30 April 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£356Average£674FlexibilityNo cancel feeOn-time76%
Search Finnair flights
American AirlinesCheapest£383Average£762FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
IberiaCheapest£447Average£607FlexibilityNo cancel feeOn-time77%
Search Iberia flights
British AirwaysCheapest£475Average£586FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LufthansaCheapest£485Average£828FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£496Average£684FlexibilityNo 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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