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$300+ Cheap flights from Illinois to London (LON)

ORD — LON
Sep 30 — Oct 71
Wed 9/30
Wed 10/7
1 adult, Economy
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1. Tell us where you want to go

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2. Select your favorite providers

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3. Compare prices and book

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Cheap flight deals from Illinois to London

Cheapest flights from Illinois to London

Wed 12/26:05 pm -
1 stop30h 45m
Wed 12/99:45 am -
1 stop20h 56m
Deal found 8/29$644
Sat 11/74:26 pm -
1 stop33h 49m
Tue 11/179:35 am -
2 stops38h 05m
Deal found 8/28$647
Wed 11/116:44 pm -
2 stops30h 06m
Thu 11/1911:00 am -
1 stop18h 16m
Deal found 8/27$655
Tue 12/16:05 pm -
1 stop30h 50m
Wed 12/99:45 am -
1 stop20h 56m
Deal found 8/30$656
Sat 11/74:26 pm -
1 stop33h 49m
Thu 11/1211:00 am -
1 stop18h 16m
Deal found 8/26$671
Sat 11/74:26 pm -
1 stop33h 49m
Thu 11/1911:00 am -
1 stop18h 16m
Deal found 8/27$680
Fri 11/66:44 pm -
2 stops55h 31m
Thu 11/1211:00 am -
1 stop18h 16m
Deal found 8/29$688
Mon 11/96:44 pm -
2 stops30h 06m
Thu 11/1911:00 am -
1 stop18h 16m
Deal found 8/27$692
Sat 11/74:26 pm -
1 stop33h 49m
Wed 11/189:50 am -
2 stops31h 29m
Deal found 8/27$693
Mon 10/197:15 pm -
1 stop14h 45m
Wed 10/2810:20 am -
1 stop12h 25m
Deal found 8/26$705
Fri 11/276:30 pm -
2 stops20h 35m
Fri 12/49:45 pm -
2 stops25h 35m
Deal found 8/29$705
Wed 10/217:15 pm -
1 stop20h 25m
Wed 10/286:10 am -
1 stop16h 35m
Deal found 8/26$705

Find flight deals from Illinois to London

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$644
(Kiwi.com)

One-way from

$300
(Kiwi.com)

Popular in

June

Cheapest in

February

Average price

$907

Good round-trip deal

$984 or less

Good one-way deal

$472 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. 23% potential increase in price ($260 potential increase over avg. RT price).
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Cheapest flight prices on average. 6% potential price decrease ($49 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

Tue 10/27

8:15 pm-4:25 pm

2 stops15h 10m

London Heathrow

Sun 11/8

9:05 pm-4:45 pm

2 stops25h 40m

$711

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Sat 11/28

6:30 pm-1:05 pm

1 stop12h 35m

London Luton

Sat 12/5

7:00 am-5:20 pm

1 stop16h 20m

$724

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Wed 10/7

11:25 am-9:05 pm

2 stops27h 40m

London Luton

Wed 10/14

9:00 am-9:40 am

2 stops30h 40m

$774

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Sun 9/27

11:05 am-6:15 pm

2 stops25h 10m

London Luton

Tue 10/6

5:40 am-8:12 pm

2 stops20h 32m

$783

St. LouisLondon

STL Lambert-St Louis - LGW London Gatwick

STLLGW

Lambert-St Louis

Sun 9/27

5:19 pm-10:00 am

1 stop34h 41m

London Gatwick

Sun 10/4

2:00 pm-4:34 pm

1 stop32h 34m

$800

ChicagoLondon

ORD Chicago O'Hare Intl - LTN London Luton

ORDLTN

Chicago O'Hare Intl

Fri 10/23

7:25 pm-4:20 pm

2 stops14h 55m

London Luton

Sat 10/31

7:15 am-7:20 pm

2 stops17h 05m

$802

ChicagoLondon

ORD Chicago O'Hare Intl - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Mon 9/28

8:10 pm-4:50 pm

1 stop38h 40m

London Stansted

Tue 10/6

5:35 pm-9:40 am

1 stop22h 05m

$831

ChicagoLondon

ORD Chicago O'Hare Intl - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Wed 11/11

11:45 am-4:20 pm

1 stop22h 35m

London Stansted

Wed 11/18

10:55 am-6:20 pm

1 stop37h 25m

$836

ChicagoLondon

ORD Chicago O'Hare Intl - STN London Stansted

ORDSTN

Chicago O'Hare Intl

Tue 9/29

8:10 pm-4:40 pm

1 stop38h 30m

London Stansted

Tue 10/6

5:35 pm-9:40 am

1 stop22h 05m

$836

ChicagoLondon

ORD Chicago O'Hare Intl - LHR London Heathrow

ORDLHR

Chicago O'Hare Intl

Tue 9/29

6:35 pm-9:00 am

Nonstop8h 25m

London Heathrow

Tue 10/13

6:50 am-12:00 pm

1 stop11h 10m

$873

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/29

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 $669). Flying from Illinois to London in June is currently the most expensive (average of $1,384). 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 Friday (54 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (42 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 $668 and $957 in November.
The cheapest round-trip price found within the last 5 days was $705 on Multiple Airlines (Nov 27-Dec 4).

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 58 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 $873, Scandinavian Airlines can have you in London from Illinois in 8h 25m. 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 City, 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 $3,300 for a flight from Illinois to London. The cheapest flight overall is $324 while the most popular route, (Chicago O'Hare Intl - London Heathrow) is currently priced at $178.

  • 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 $669). Flying from Illinois to London in June is currently the most expensive (average of $1,384). 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
Eastleigh
Gatwick
Hounslow
Harrow
Wembley
Southend-on-Sea
Basingstoke
Watford
Dartford
Croydon
Chipping Norton
Kingston upon Thames
Eastbourne
Slough
Stansted
Sutton
Luton

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$721FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$430Average$578FlexibilityNo cancel feeOn-time76%
SWISSCheapest$458Average$823FlexibilityNo cancel feeOn-time79%
Scandinavian AirlinesCheapest$476Average$662FlexibilityNo cancel feeOn-time77%
Alaska AirlinesCheapest$522Average$809FlexibilityNo cancel feeOn-time75%
FinnairCheapest$537Average$854FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$579Average$909FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$580Average$943FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$584Average$1,169FlexibilityNo cancel feeOn-time69%

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