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Cheap flights from Illinois to the United Kingdom from $187

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 10/8. 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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Find the cheapest flights from Illinois to the United Kingdom

Cheap round-trip flights

Scandinavian Airlines Logo
7:20 pm - 4:25 pmORD-LHR
15h 05m2 stops
Scandinavian Airlines Logo
10:20 am - 4:45 pmLHR-ORD
12h 25m1 stop
$426Scandinavian Airlines
Find Deal
Fri, Nov 7 - Sun, Nov 9
Scandinavian Airlines Logo
7:20 pm - 6:30 pmORD-LHR
17h 10m2 stops
Scandinavian Airlines Logo
9:55 am - 4:45 pmLHR-ORD
36h 50m2 stops
$432Scandinavian Airlines
Find Deal
Fri, Nov 7 - Sun, Nov 9
Logo
10:40 am - 12:00 pmORD-STN
19h 20m2 stops
Logo
9:45 pm - 8:22 pmSTN-ORD
28h 37m2 stops
$460
Find Deal
Tue, Oct 14 - Tue, Oct 21
Logo
10:40 am - 11:50 amORD-STN
19h 10m2 stops
Logo
6:30 am - 8:22 pmSTN-ORD
19h 52m2 stops
$466
Find Deal
Sun, Oct 12 - Wed, Oct 22
Lufthansa Logo
12:50 pm - 6:55 amORD-LHR
12h 05m1 stop
Lufthansa Logo
6:50 am - 12:05 pmLHR-ORD
11h 15m1 stop
$470Lufthansa
Find Deal
Sun, Sep 21 - Tue, Sep 30
Virgin Atlantic Logo
1:25 pm - 10:00 amORD-LGW
14h 35m1 stop
Virgin Atlantic Logo
12:00 pm - 9:47 pmLGW-ORD
15h 47m1 stop
$471Virgin Atlantic
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Mon, Aug 18 - Tue, Sep 2
United Airlines Logo
4:07 pm - 11:35 amORD-LHR
13h 28m1 stop
United Airlines Logo
7:25 am - 2:00 pmLHR-ORD
12h 35m1 stop
$476United Airlines
Find Deal
Sun, Aug 17 - Tue, Aug 26
Lufthansa Logo
4:00 pm - 6:20 amORD-LHR
8h 20mnonstop
Lufthansa Logo
11:05 am - 2:10 pmLHR-ORD
9h 05mnonstop
$481Lufthansa
Find Deal
Sun, Sep 21 - Tue, Sep 30
Virgin Atlantic Logo
5:30 pm - 1:10 pmSTL-LHR
13h 40m1 stop
Virgin Atlantic Logo
11:45 am - 7:01 pmLHR-STL
13h 16m1 stop
$494Virgin Atlantic
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Wed, Sep 3 - Wed, Sep 10
United Airlines Logo
1:30 pm - 9:35 amSTL-LHR
14h 05m1 stop
United Airlines Logo
2:05 pm - 10:49 amLHR-STL
26h 44m2 stops
$501United Airlines
Find Deal
Tue, Oct 14 - Wed, Oct 22

British Airways flights from Illinois to United Kingdom

Our best British Airways deals on Illinois to United Kingdom flight tickets
British Airways
Aug 18
ORD5:40 pmChicago O'Hare Intl
7h 40m
LHR7:20 amLondon Heathrow
Aug 28
LHR6:20 amLondon Heathrow
15h 25m
1 stop
ORD3:45 pmChicago O'Hare Intl
$484
Find similar
British Airways
Sep 3
ORD10:35 pmChicago O'Hare Intl
7h 40m
LHR12:15 pmLondon Heathrow
Sep 18
LHR8:20 amLondon Heathrow
13h 25m
1 stop
ORD3:45 pmChicago O'Hare Intl
$485
Find similar
British Airways
Aug 14
ORD8:34 pmChicago O'Hare Intl
33h 56m
1 stop
LHR12:30 pmLondon Heathrow
Aug 17
LHR8:50 amLondon Heathrow
34h 40m
1 stop
ORD1:30 pmChicago O'Hare Intl
$489
Find similar

Scandinavian Airlines flights from Illinois to United Kingdom

Our best Scandinavian Airlines deals on Illinois to United Kingdom flight tickets
Scandinavian Airlines
Nov 7
ORD7:20 pmChicago O'Hare Intl
15h 05m
2 stops
LHR4:25 pmLondon Heathrow
Nov 9
LHR10:20 amLondon Heathrow
12h 25m
1 stop
ORD4:45 pmChicago O'Hare Intl
$426
Find similar
Scandinavian Airlines
Nov 7
ORD7:20 pmChicago O'Hare Intl
17h 10m
2 stops
LHR6:30 pmLondon Heathrow
Nov 9
LHR9:55 amLondon Heathrow
36h 50m
2 stops
ORD4:45 pmChicago O'Hare Intl
$432
Find similar
Scandinavian Airlines
Nov 6
ORD7:20 pmChicago O'Hare Intl
35h 35m
2 stops
LHR12:55 pmLondon Heathrow
Nov 9
LHR6:40 amLondon Heathrow
16h 05m
2 stops
ORD4:45 pmChicago O'Hare Intl
$436
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 August 8, 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

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 11/7

7:20 pm-4:25 pm

2 stops15h 05m

London Heathrow

Sun 11/9

10:20 am-4:45 pm

1 stop12h 25m

$426

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Fri 11/7

7:20 pm-6:30 pm

2 stops17h 10m

London Heathrow

Sun 11/9

9:55 am-4:45 pm

2 stops36h 50m

$432

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Tue 10/14

10:40 am-12:00 pm

2 stops19h 20m

London Stansted

Tue 10/21

9:45 pm-8:22 pm

2 stops28h 37m

$460

ChicagoLondon

ORD - STN

ORDSTN

Chicago O'Hare Intl

Sun 10/12

10:40 am-11:50 am

2 stops19h 10m

London Stansted

Wed 10/22

6:30 am-8:22 pm

2 stops19h 52m

$466

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 9/21

12:50 pm-6:55 am

1 stop12h 05m

London Heathrow

Tue 9/30

6:50 am-12:05 pm

1 stop11h 15m

$470

ChicagoLondon

ORD - LGW

ORDLGW

Chicago O'Hare Intl

Mon 8/18

1:25 pm-10:00 am

1 stop14h 35m

London Gatwick

Tue 9/2

12:00 pm-9:47 pm

1 stop15h 47m

$471

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 8/17

4:07 pm-11:35 am

1 stop13h 28m

London Heathrow

Tue 8/26

7:25 am-2:00 pm

1 stop12h 35m

$476

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 9/21

4:00 pm-6:20 am

Nonstop8h 20m

London Heathrow

Tue 9/30

11:05 am-2:10 pm

Nonstop9h 05m

$481

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Wed 9/3

5:30 pm-1:10 pm

1 stop13h 40m

London Heathrow

Wed 9/10

11:45 am-7:01 pm

1 stop13h 16m

$494

St. LouisLondon

STL - LHR

STLLHR

Lambert-St Louis

Tue 10/14

1:30 pm-9:35 am

1 stop14h 05m

London Heathrow

Wed 10/22

2:05 pm-10:49 am

2 stops26h 44m

$501

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 $648. If you aren’t able to travel to United Kingdom during the month of February, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $666.

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 $762. The most expensive day to fly to United Kingdom is Saturday, with ticket prices averaging around $890.

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 $683. 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 $823. 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 $795 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 $703 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 66% 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

$187

Fastest flight time

7h 40m

Direct flights

Every day

Airports in United Kingdom

5 airports
The best one-way flight to United Kingdom from Illinois in the past 72 hours is $187. The best round-trip flight deal from Illinois to United Kingdom found on momondo in the last 72 hours is $426.
The fastest flight from Illinois to United Kingdom takes 7h 40m
Direct flights go from Illinois to United Kingdom every day.
There are 5 airports near United Kingdom: London City (LCY), London Heathrow (LHR), London Stansted (STN), London Gatwick (LGW), Glasgow Intl (GLA)
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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
2,915 reviews
Search JetBlue flights
SWISSPriceFrom $257Free CancellationRating
7.5
1,692 reviews
Search SWISS flights
Scandinavian AirlinesPriceFrom $338Free CancellationRating
7.4
1,465 reviews
Search Scandinavian Airlines flights
DeltaPriceFrom $345Free CancellationRating
8.0
7,987 reviews
Search Delta flights
LufthansaPriceFrom $430Free CancellationRating
6.8
7,296 reviews
Search Lufthansa flights
IcelandairPriceFrom $469Free CancellationRating
7.0
524 reviews
Search Icelandair flights
British AirwaysPriceFrom $502Free CancellationRating
6.6
7,251 reviews
Search British Airways flights
TAP AIR PORTUGALPriceFrom $506Free CancellationRating
7.1
1,944 reviews
Search TAP AIR PORTUGAL flights
Aer LingusPriceFrom $531Free CancellationRating
7.1
1,202 reviews
Search Aer Lingus flights
FinnairPriceFrom $566Free CancellationRating
7.6
1,319 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 $277
Flights to Manchesterfrom $358
Flights to Edinburghfrom $431
Flights to Birminghamfrom $444
Flights to Glasgowfrom $417
Flights to Belfastfrom $498
Flights to Newcastle upon Tynefrom $476
Flights to Bristolfrom $473
Flights to Invernessfrom $401
Flights to Liverpoolfrom $424
Flights to Aberdeenfrom $484
Flights to Leedsfrom $469