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Cheap flights from London to Illinois from $250

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London to Illinois departing on 1/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
7:05 am - 4:45 pmLHR-ORD
15h 40m2 stops
Scandinavian Airlines Logo
7:20 pm - 9:20 amORD-LHR
32h 00m1 stop
$532Scandinavian Airlines
Find Deal
Mon, Nov 17 - Fri, Feb 6
Scandinavian Airlines Logo
6:40 am - 4:45 pmLHR-ORD
16h 05m1 stop
Scandinavian Airlines Logo
7:20 pm - 4:00 pmORD-LHR
14h 40m1 stop
$533Scandinavian Airlines
Find Deal
Thu, Nov 13 - Sun, Nov 23
Multiple Airlines Logo
6:50 am - 5:20 pmLTN-ORD
16h 30m2 stops
Multiple Airlines Logo
6:30 pm - 11:05 pmORD-LTN
22h 35m2 stops
$533Multiple Airlines
Find Deal
Wed, Nov 26 - Wed, Dec 3
Icelandair Logo
11:55 am - 5:20 pmLGW-ORD
11h 25m1 stop
Icelandair Logo
6:30 pm - 10:55 amORD-LGW
10h 25m1 stop
$560Icelandair
Find Deal
Wed, Nov 26 - Wed, Dec 3
Icelandair Logo
12:15 pm - 5:20 pmLHR-ORD
11h 05m1 stop
Icelandair Logo
6:30 pm - 10:50 amORD-LHR
10h 20m1 stop
$564Icelandair
Find Deal
Tue, Nov 25 - Tue, Dec 2
British Airways Logo
11:55 am - 7:30 pmLHR-STL
13h 35m1 stop
British Airways Logo
3:59 pm - 10:00 amSTL-LHR
12h 01m1 stop
$722British Airways
Find Deal
Wed, Nov 26 - Wed, Dec 3
American Airlines Logo
11:20 am - 6:08 pmLGW-STL
36h 48m2 stops
American Airlines Logo
9:39 am - 9:00 amSTL-LGW
18h 21m2 stops
$723American Airlines
Find Deal
Thu, Mar 5 - Mon, Mar 9
American Airlines Logo
12:30 pm - 6:08 pmLGW-STL
35h 38m2 stops
American Airlines Logo
5:30 am - 9:00 amSTL-LGW
22h 30m2 stops
$728American Airlines
Find Deal
Thu, Mar 5 - Mon, Mar 9
British Airways Logo
2:45 pm - 11:12 pmLHR-STL
14h 27m1 stop
British Airways Logo
12:01 pm - 6:30 amSTL-LHR
12h 29m1 stop
$743British Airways
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Tue, Jan 13 - Fri, Jan 23
Iberia Logo
10:45 am - 9:03 amLHR-STL
28h 18m2 stops
Iberia Logo
9:34 am - 6:50 amSTL-LHR
15h 16m1 stop
$809Iberia
Find Deal
Thu, Jan 8 - Fri, Jan 16

Scandinavian Airlines flights from London to Illinois

Our best Scandinavian Airlines deals on London to Illinois flight tickets
Scandinavian Airlines
Nov 17
LHR7:05 amLondon Heathrow
15h 40m
2 stops
ORD4:45 pmChicago O'Hare Intl
Feb 6
ORD7:20 pmChicago O'Hare Intl
32h 00m
1 stop
LHR9:20 amLondon Heathrow
$532
Find similar
Scandinavian Airlines
Nov 13
LHR6:40 amLondon Heathrow
16h 05m
1 stop
ORD4:45 pmChicago O'Hare Intl
Nov 23
ORD7:20 pmChicago O'Hare Intl
14h 40m
1 stop
LHR4:00 pmLondon Heathrow
$533
Find similar
Scandinavian Airlines
Nov 19
LHR10:20 amLondon Heathrow
12h 25m
1 stop
ORD4:45 pmChicago O'Hare Intl
Nov 26
ORD7:20 pmChicago O'Hare Intl
15h 05m
2 stops
LHR4:25 pmLondon Heathrow
$534
Find similar

SWISS flights from London to Illinois

Our best SWISS deals on London to Illinois flight tickets
SWISS
Nov 25
LCY9:15 amLondon City
13h 05m
1 stop
ORD4:20 pmChicago O'Hare Intl
Dec 2
ORD6:50 pmChicago O'Hare Intl
12h 05m
1 stop
LCY12:55 pmLondon City
$647
Find similar
SWISS
Nov 25
LCY7:10 pmLondon City
23h 35m
1 stop
ORD12:45 pmChicago O'Hare Intl
Dec 1
ORD4:10 pmChicago O'Hare Intl
14h 45m
1 stop
LCY12:55 pmLondon City
$673
Find similar
SWISS
Dec 4
LCY9:15 amLondon City
13h 05m
1 stop
ORD4:20 pmChicago O'Hare Intl
Dec 8
ORD6:50 pmChicago O'Hare Intl
12h 05m
1 stop
LCY12:55 pmLondon City
$676
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from London to Illinois 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, momondo users made 832,500 searches. Data last updated October 30, 2025.
Use the filters below to find and compare flights from London to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 11/17

7:05 am-4:45 pm

2 stops15h 40m

Chicago O'Hare Intl

Fri 2/6

7:20 pm-9:20 am

1 stop32h 00m

$532

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 11/13

6:40 am-4:45 pm

1 stop16h 05m

Chicago O'Hare Intl

Sun 11/23

7:20 pm-4:00 pm

1 stop14h 40m

$533

LondonChicago

LTN - ORD

LTNORD

London Luton

Wed 11/26

6:50 am-5:20 pm

2 stops16h 30m

Chicago O'Hare Intl

Wed 12/3

6:30 pm-11:05 pm

2 stops22h 35m

$533

LondonChicago

LGW - ORD

LGWORD

London Gatwick

Wed 11/26

11:55 am-5:20 pm

1 stop11h 25m

Chicago O'Hare Intl

Wed 12/3

6:30 pm-10:55 am

1 stop10h 25m

$560

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 11/25

12:15 pm-5:20 pm

1 stop11h 05m

Chicago O'Hare Intl

Tue 12/2

6:30 pm-10:50 am

1 stop10h 20m

$564

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 11/26

11:55 am-7:30 pm

1 stop13h 35m

Lambert-St Louis

Wed 12/3

3:59 pm-10:00 am

1 stop12h 01m

$722

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 3/5

11:20 am-6:08 pm

2 stops36h 48m

Lambert-St Louis

Mon 3/9

9:39 am-9:00 am

2 stops18h 21m

$723

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 3/5

12:30 pm-6:08 pm

2 stops35h 38m

Lambert-St Louis

Mon 3/9

5:30 am-9:00 am

2 stops22h 30m

$728

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 1/13

2:45 pm-11:12 pm

1 stop14h 27m

Lambert-St Louis

Fri 1/23

12:01 pm-6:30 am

1 stop12h 29m

$743

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 1/8

10:45 am-9:03 am

2 stops28h 18m

Lambert-St Louis

Fri 1/16

9:34 am-6:50 am

1 stop15h 16m

$809

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

How to get the cheapest flight ticket from London to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from London is in February. Flight prices, which tend to average around $578, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of February, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $584.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from London to Illinois is on a Wednesday when prices can be found for as low as $779. Flights from London to Illinois on a Sunday will generally be more expensive and average around $889. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the evening. Flights from London to Illinois during this time can be as low as $620. Flights in the afternoon are often more expensive with an average ticket price of $920.

What is the cheapest London to Illinois flight route?

Fly from London Heathrow to Chicago O'Hare Intl for the best London - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from London when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $732 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from London for as low as $693 on momondo.

What cabin class options are available on London to Illinois flights?

There are 4 cabin classes available to choose from on London to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London to Illinois flights?

You could potentially save up to 2% on your flight if you consider stops on a London to Illinois flight.

Cheap London to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London to Illinois

Best Price Found

$594

Fastest flight time

8h 25m

Direct flights

Every day

Airports in Illinois

1 airport
The best one-way flight to Illinois from London in the past 72 hours is $594. The best round-trip flight deal from London to Illinois found on momondo in the last 72 hours is $717.
The fastest flight from London to Illinois takes 8h 25m
Direct flights go from London to Illinois every day.
There is 1 airport near Illinois: Chicago O'Hare Intl (ORD)
Search flight deals

  • When did momondo last update prices for flights from London to Illinois?

    Prices for flights from London to Illinois refresh daily.

  • How many operators does momondo search for flights from London to Illinois?

  • How old do you have to be to fly from London to Illinois?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from London to Illinois.

  • What documentation or ID do you need to fly to Illinois?

    The required travel and health documents for your Illinois trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Illinois. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from London to Illinois?

Best airlines flying from London to Illinois

Compare and see reviews for airlines that fly from London to Illinois with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $390Free CancellationRating
7.1
562 reviews
Search Icelandair flights
Aer LingusPriceFrom $446Free CancellationRating
7.2
1,365 reviews
Search Aer Lingus flights
United AirlinesPriceFrom $485Free CancellationRating
7.4
8,999 reviews
Search United Airlines flights
Austrian AirlinesPriceFrom $530Free CancellationRating
7.6
862 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom $553Free CancellationRating
6.7
7,488 reviews
Search British Airways flights
TAP AIR PORTUGALPriceFrom $558Free CancellationRating
7.1
2,040 reviews
Search TAP AIR PORTUGAL flights
American AirlinesPriceFrom $572Free CancellationRating
7.2
11,034 reviews
Search American Airlines flights
IberiaPriceFrom $599Free CancellationRating
7.0
3,004 reviews
Search Iberia flights
FinnairPriceFrom $626Free CancellationRating
7.6
1,333 reviews
Search Finnair flights
Brussels AirlinesPriceFrom $633Free CancellationRating
7.2
369 reviews
Search Brussels Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Illinois?

It is quick and easy to find London to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.

Can I find flights from London to Illinois with flexible booking policies on momondo?

Flights from London to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from London to Illinois?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from London.

I’m not ready to book a flight from London to Illinois right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of London to Illinois flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Find better results for your trip to Illinois

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