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Cheap flights from Illinois to the United Kingdom from $224

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to the United Kingdom departing on 10/15. 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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Find the cheapest flights from Illinois to the United Kingdom

Cheap round-trip flights

Icelandair Logo
6:30 pm - 9:55 amORD-GLA
9h 25m1 stop
Icelandair Logo
12:35 pm - 5:20 pmGLA-ORD
10h 45m1 stop
$478Icelandair
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Tue, Nov 11 - Tue, Nov 18
Icelandair Logo
6:30 pm - 9:55 amORD-GLA
9h 25m1 stop
Icelandair Logo
12:35 pm - 5:20 pmGLA-ORD
10h 45m1 stop
$479Icelandair
Find Deal
Thu, Jan 15 - Mon, Jan 19
Scandinavian Airlines Logo
8:20 pm - 8:55 amORD-LHR
31h 35m2 stops
Scandinavian Airlines Logo
7:05 am - 4:45 pmLHR-ORD
15h 40m2 stops
$510Scandinavian Airlines
Find Deal
Fri, Oct 31 - Mon, Nov 3
Multiple Airlines Logo
10:15 am - 6:00 amORD-LGW
13h 45m1 stop
Multiple Airlines Logo
1:00 pm - 3:55 pmLGW-ORD
32h 55m1 stop
$511Multiple Airlines
Find Deal
Mon, Jan 12 - Sun, Jan 25
Multiple Airlines Logo
7:10 pm - 6:00 pmORD-LHR
16h 50m2 stops
Multiple Airlines Logo
9:55 am - 3:00 pmLHR-ORD
35h 05m2 stops
$513Multiple Airlines
Find Deal
Wed, Nov 5 - Tue, Nov 11
United Airlines Logo
6:00 pm - 8:20 amORD-LHR
8h 20mnonstop
United Airlines Logo
11:05 am - 2:10 pmLHR-ORD
9h 05mnonstop
$517United Airlines
Find Deal
Mon, Oct 6 - Tue, Oct 14
TAP AIR PORTUGAL Logo
8:25 pm - 8:35 pmORD-LGW
18h 10m2 stops
TAP AIR PORTUGAL Logo
4:35 pm - 2:45 pmLGW-ORD
28h 10m1 stop
$518TAP AIR PORTUGAL
Find Deal
Sun, Nov 2 - Sat, Nov 8
Scandinavian Airlines Logo
7:20 pm - 4:25 pmORD-LHR
39h 05m2 stops
Scandinavian Airlines Logo
10:20 am - 4:45 pmLHR-ORD
12h 25m1 stop
$520Scandinavian Airlines
Find Deal
Thu, Feb 26 - Sun, Mar 1
TAP AIR PORTUGAL Logo
7:10 pm - 3:05 pmORD-LGW
13h 55m1 stop
TAP AIR PORTUGAL Logo
9:20 pm - 4:00 pmLGW-ORD
23h 40m2 stops
$522TAP AIR PORTUGAL
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Wed, Mar 4 - Tue, Mar 10
United Airlines Logo
4:05 pm - 8:35 pmSTL-LHR
46h 30m2 stops
United Airlines Logo
6:30 am - 1:55 pmLHR-STL
13h 25m1 stop
$583United Airlines
Find Deal
Fri, Feb 27 - Sun, Mar 8

Virgin Atlantic flights from Illinois to United Kingdom

Our best Virgin Atlantic deals on Illinois to United Kingdom flight tickets
Virgin Atlantic
Oct 29
MDW1:08 pmChicago Midway
14h 52m
2 stops
LHR9:00 amLondon Heathrow
Nov 7
LHR9:00 amLondon Heathrow
19h 14m
2 stops
MDW10:14 pmChicago Midway
$641
Find similar
Virgin Atlantic
Sep 29
MDW9:35 amChicago Midway
17h 20m
1 stop
LHR8:55 amLondon Heathrow
Nov 7
LHR6:30 amLondon Heathrow
17h 13m
2 stops
MDW5:43 pmChicago Midway
$655
Find similar
Virgin Atlantic
Oct 5
MDW12:43 pmChicago Midway
18h 47m
1 stop
LHR1:30 pmLondon Heathrow
Oct 14
LHR11:45 amLondon Heathrow
12h 40m
1 stop
MDW6:25 pmChicago Midway
$660
Find similar

United Airlines flights from Illinois to United Kingdom

Our best United Airlines deals on Illinois to United Kingdom flight tickets
United Airlines
Oct 6
ORD6:00 pmChicago O'Hare Intl
8h 20m
LHR8:20 amLondon Heathrow
Oct 14
LHR11:05 amLondon Heathrow
9h 05m
ORD2:10 pmChicago O'Hare Intl
$517
Find similar
United Airlines
Feb 27
STL4:05 pmLambert-St Louis
46h 30m
2 stops
LHR8:35 pmLondon Heathrow
Mar 8
LHR6:30 amLondon Heathrow
13h 25m
1 stop
STL1:55 pmLambert-St Louis
$583
Find similar
United Airlines
Feb 27
STL4:05 pmLambert-St Louis
46h 30m
2 stops
LHR8:35 pmLondon Heathrow
Mar 8
LHR4:00 pmLondon Heathrow
23h 27m
2 stops
STL10:27 amLambert-St Louis
$589
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Illinois to United Kingdom 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 September 23, 2025.
Use the filters below to find and compare flights from Illinois to the United Kingdom that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Tue 11/11

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Tue 11/18

12:35 pm-5:20 pm

1 stop10h 45m

$478

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Thu 1/15

6:30 pm-9:55 am

1 stop9h 25m

Glasgow Intl

Mon 1/19

12:35 pm-5:20 pm

1 stop10h 45m

$479

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 10/31

8:20 pm-8:55 am

2 stops31h 35m

London Heathrow

Mon 11/3

7:05 am-4:45 pm

2 stops15h 40m

$510

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 1/12

10:15 am-6:00 am

1 stop13h 45m

London Gatwick

Sun 1/25

1:00 pm-3:55 pm

1 stop32h 55m

$511

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 11/5

7:10 pm-6:00 pm

2 stops16h 50m

London Heathrow

Tue 11/11

9:55 am-3:00 pm

2 stops35h 05m

$513

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 10/6

6:00 pm-8:20 am

Nonstop8h 20m

London Heathrow

Tue 10/14

11:05 am-2:10 pm

Nonstop9h 05m

$517

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Sun 11/2

8:25 pm-8:35 pm

2 stops18h 10m

London Gatwick

Sat 11/8

4:35 pm-2:45 pm

1 stop28h 10m

$518

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Thu 2/26

7:20 pm-4:25 pm

2 stops39h 05m

London Heathrow

Sun 3/1

10:20 am-4:45 pm

1 stop12h 25m

$520

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Wed 3/4

7:10 pm-3:05 pm

1 stop13h 55m

London Gatwick

Tue 3/10

9:20 pm-4:00 pm

2 stops23h 40m

$522

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Fri 2/27

4:05 pm-8:35 pm

2 stops46h 30m

London Heathrow

Sun 3/8

6:30 am-1:55 pm

1 stop13h 25m

$583

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 the United Kingdom from

How to get the cheapest flight ticket from Illinois to United Kingdom

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 United Kingdom?

In general, February is the cheapest month to fly from Illinois to United Kingdom. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $651. If you aren’t able to travel to United Kingdom 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 $659.

What is the cheapest day to depart on your flight to United Kingdom?

The cheapest day to depart from Illinois to United Kingdom is on a Tuesday when prices can be found for as low as $761. The most expensive day to fly to United Kingdom is Saturday, with ticket prices averaging around $907.

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

According to our data, the cheapest time of day to fly to United Kingdom is in the morning. momondo users have found flights departing from Illinois to United Kingdom in the morning for as low as $663. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to United Kingdom are more costly in the afternoon, with an average ticket price of $825. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Illinois to United Kingdom flight route?

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

How far in advance should I book a flight to United Kingdom?

You are more likely to see cheaper flights to United Kingdom from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to United Kingdom for around $793 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to United Kingdom from Illinois for as low as $694 on momondo.

What cabin class options are available on Illinois to United Kingdom flights?

There are 4 cabin classes available to choose from on Illinois to United Kingdom 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 Illinois to United Kingdom flights?

You could potentially save up to 47% on your flight if you consider stops on a Illinois to United Kingdom flight.

Cheap Illinois to United Kingdom flight deals and tips

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

Best Price Found

$438

Fastest flight time

7h 40m

Direct flights

Every day

Airports in United Kingdom

2 airports
The best one-way flight to United Kingdom from Illinois in the past 72 hours is $438. The best round-trip flight deal from Illinois to United Kingdom found on momondo in the last 72 hours is $636.
The fastest flight from Illinois to United Kingdom takes 7h 40m
Direct flights go from Illinois to United Kingdom every day.
There are 2 airports near United Kingdom: London Heathrow (LHR), Edinburgh Turnhouse (EDI)
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  • When did momondo last update prices for flights from Illinois to United Kingdom?

    Prices for flights from Illinois to United Kingdom are updated daily.

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

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

    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 Illinois to United Kingdom.

  • What documentation or ID do you need to fly to United Kingdom?

    The required travel and health documents for your United Kingdom 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 United Kingdom. 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 Illinois to United Kingdom?

Best airlines flying from Illinois to United Kingdom

Compare and see reviews for airlines that fly from Illinois to United Kingdom with momondo
Airline
Rating
Free Cancellation
Price
JetBluePriceFrom $51Free CancellationRating
7.2
2,912 reviews
Search JetBlue flights
SWISSPriceFrom $257Free CancellationRating
7.6
1,742 reviews
Search SWISS flights
Scandinavian AirlinesPriceFrom $338Free CancellationRating
7.4
1,492 reviews
Search Scandinavian Airlines flights
DeltaPriceFrom $345Free CancellationRating
7.9
7,974 reviews
Search Delta flights
LufthansaPriceFrom $430Free CancellationRating
6.8
7,421 reviews
Search Lufthansa flights
TAP AIR PORTUGALPriceFrom $450Free CancellationRating
7.1
1,988 reviews
Search TAP AIR PORTUGAL flights
IcelandairPriceFrom $472Free CancellationRating
7.0
545 reviews
Search Icelandair flights
British AirwaysPriceFrom $502Free CancellationRating
6.7
7,391 reviews
Search British Airways flights
Aer LingusPriceFrom $515Free CancellationRating
7.2
1,296 reviews
Search Aer Lingus flights
FinnairPriceFrom $547Free CancellationRating
7.6
1,326 reviews
Search Finnair flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Illinois to United Kingdom for you.

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

Yes. All flights to United Kingdom from Illinois on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Illinois to United Kingdom?

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 United Kingdom from Illinois.

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

Price alerts on flights to United Kingdom from Illinois are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your United Kingdom trip

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Find better results for your trip to the United Kingdom

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo
Flights to Londonfrom $328
Flights to Manchesterfrom $381
Flights to Edinburghfrom $404
Flights to Glasgowfrom $389
Flights to Birminghamfrom $392
Flights to Newcastle upon Tynefrom $430
Flights to Belfastfrom $469
Flights to Bristolfrom $461
Flights to Invernessfrom $455
Flights to Liverpoolfrom $415
Flights to Aberdeenfrom $486
Flights to Leedsfrom $445