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$264+ Cheap flights from Illinois to London (LON)

ORD — LON
Sep 21 — Sep 281
Mon 9/21
Mon 9/28
1 adult, Economy
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1. Tell us where you want to go

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Cheap flight deals from Illinois to London

Cheapest flights from Illinois to London

Sat 10/244:30 pm -
1 stop34h 45m
Tue 11/310:10 am -
2 stops29h 30m
Deal found 8/21$610
Mon 10/196:35 pm -
2 stops33h 25m
Thu 10/2911:00 am -
1 stop17h 16m
Deal found 8/21$641
Fri 10/236:35 pm -
2 stops33h 25m
Thu 11/511:00 am -
1 stop18h 16m
Deal found 8/21$648
Fri 10/236:35 pm -
2 stops33h 25m
Fri 11/612:35 pm -
1 stop16h 41m
Deal found 8/21$652
Sun 10/184:30 pm -
1 stop35h 30m
Wed 11/410:10 am -
2 stops29h 30m
Deal found 8/17$654
Tue 10/67:15 pm -
3 stops19h 20m
Tue 10/133:05 pm -
2 stops31h 05m
Deal found 8/22$656
Mon 10/196:35 pm -
2 stops33h 25m
Fri 10/3012:35 pm -
1 stop15h 41m
Deal found 8/21$657
Mon 10/53:45 pm -
1 stop10h 10m
Mon 10/198:40 am -
1 stop16h 35m
Deal found 8/21$658
Wed 10/216:35 pm -
2 stops33h 25m
Thu 10/2911:00 am -
1 stop17h 16m
Deal found 8/21$659
Tue 12/16:15 am -
1 stop17h 45m
Tue 12/810:10 am -
1 stop33h 01m
Deal found 8/21$660
Fri 10/97:15 pm -
2 stops42h 40m
Mon 10/126:40 am -
1 stop15h 30m
Deal found 8/21$661
Tue 11/310:35 am -
2 stops37h 25m
Thu 11/1211:00 am -
1 stop14h 39m
Deal found 8/18$662

Find flight deals from Illinois to London

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$610
(Kiwi.com)

One-way from

$264
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$899

Good round-trip deal

$990 or less

Good one-way deal

$442 or less
Provider with most accurate pricing for Chicago (CHI)-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Chicago (CHI)-London (LON) flights.
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From Illinois to London (LON)
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One-way flight from Illinois to London (LON)
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Highest demand for flights based on searches. 24% potential increase in price ($267 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($50 potential savings vs. average RT price).
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Average for round-trip flights in August 2026
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Price to beat on a round-trip flight from Illinois to London (LON).
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Price to beat on a one-way flight from Illinois to London (LON).
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Illinois to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Sun 11/8

7:15 pm-5:40 pm

1 stop16h 25m

London Heathrow

Thu 11/12

5:00 pm-4:45 pm

1 stop29h 45m

$713

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Sat 2/6

6:30 pm-10:50 am

1 stop10h 20m

London Heathrow

Fri 2/26

12:15 pm-5:20 pm

1 stop11h 05m

$737

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Fri 10/2

7:15 pm-7:05 pm

2 stops17h 50m

London Luton

Mon 10/12

7:45 pm-4:10 pm

2 stops26h 25m

$743

St. LouisLondon

STL Lambert-St Louis - LHR London Heathrow

STLLHR

Lambert-St Louis

Mon 1/11

6:30 am-7:10 am

2 stops18h 40m

London Heathrow

Wed 1/13

6:50 am-3:41 pm

2 stops14h 51m

$751

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Fri 11/6

6:30 pm-1:55 pm

1 stop13h 25m

London Luton

Wed 11/11

8:00 am-5:20 pm

1 stop15h 20m

$762

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Mon 10/12

2:15 pm-7:05 pm

2 stops22h 50m

London Luton

Fri 10/16

8:00 am-7:55 pm

2 stops17h 55m

$769

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Thu 10/29

7:30 pm-10:00 pm

2 stops21h 30m

London Luton

Mon 11/2

8:20 am-5:20 pm

2 stops15h 00m

$782

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Fri 10/2

7:15 pm-7:05 pm

2 stops17h 50m

London Luton

Fri 10/9

2:50 pm-4:10 pm

2 stops31h 20m

$786

ChicagoLondon

ORD Chicago O'Hare Intl - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Thu 2/4

8:15 pm-4:20 pm

1 stop38h 05m

London Stansted

Tue 2/9

5:20 pm-10:00 am

1 stop22h 40m

$835

ChicagoLondon

ORD Chicago O'Hare Intl - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Thu 11/26

8:15 pm-9:55 am

1 stop31h 40m

London Stansted

Thu 12/3

5:20 pm-6:20 pm

1 stop31h 00m

$835

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

Showing 1-10 of 60 resultsSorted by cheapest first
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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 round-trip price

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 $668). Flying from Illinois to London in June is currently the most expensive (average of $1,383). 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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to London as you normally would.

Weekly flight availability from Illinois to London

The most flights from USIL to LON are scheduled on a Wednesday (54 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (48 on average).

How much does it cost to fly round-trip from Illinois to London?

Airfare is typical for this route at the moment.
Illinois to London flights typically cost between $653 and $976 in October.
The cheapest round-trip price found within the last 5 days was $656 on Multiple Airlines (Oct 6-Oct 13).

How far ahead should I book a flight from Illinois to London?

To ensure you get the cheapest price possible for a flight from Illinois to London, you should look to book at least 9 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

Related info for your journey

  • How long is the flight from Illinois to London?

    For as low as $720, Scandinavian Airlines can have you in London from Illinois in 18h 40m. The distance between Illinois and London is about 3939 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    For one-way options, check prices for Finnair. According to our data, you can fly for as low as $279. Users have also found prices from $280 and $292 on Icelandair and Brussels Airlines, respectively.

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

    While some choose either Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London Stansted, Chicago O'Hare Intl - London Heathrow is the most popular route from Illinois to London.

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

    No one likes to see their flight delayed. When booking a flight from Illinois to London consider choosing Air Canada (62%), Austrian Airlines (62%) or United Airlines (62%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Illinois to London?

    On average you can expect to pay $3,467 for a flight from Illinois to London. The cheapest flight overall is $331 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $542.

  • 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 vacation 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 $668). Flying from Illinois to London in June is currently the most expensive (average of $1,383). 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

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Ilford
Dorking
Winchester
Gatwick
Hounslow
Wembley
Harrow
Eastleigh
Southend-on-Sea
Watford
Dartford
Croydon
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton
Harlow

Browse thousands of different options on Cheapflights for your next trip

Top 10 airlines flying from Illinois to London

AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$362Average$781FlexibilityNo cancel feeOn-time67%
TAP AIR PORTUGALCheapest$428Average$713FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$430Average$574FlexibilityNo cancel feeOn-time76%
SWISSCheapest$458Average$823FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$476Average$633FlexibilityNo cancel feeOn-time77%
FinnairCheapest$520Average$850FlexibilityNo cancel feeOn-time76%
Alaska AirlinesCheapest$522Average$809FlexibilityNo cancel feeOn-time75%
British AirwaysCheapest$566Average$930FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$579Average$909FlexibilityNo cancel feeOn-timeN/A
DeltaCheapest$581Average$746FlexibilityNo cancel feeOn-timeN/A

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