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Cheap flights from Illinois to the United Kingdom from $232

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 3/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Illinois to the United Kingdom

Cheap round-trip flights

Enter your travel dates to find the best prices.
Icelandair Logo
7:25 pm - 1:35 pm
ORD
-
GLA
12h 10m
1 stop
Icelandair Logo
2:30 pm - 9:25 pm
GLA
-
ORD
12h 55m
1 stop
$510Icelandair
Sat, Apr 4 - Fri, Apr 10
Icelandair Logo
7:25 pm - 1:25 pm
ORD
-
GLA
12h 00m
1 stop
Icelandair Logo
2:20 pm - 6:15 pm
GLA
-
ORD
9h 55m
1 stop
$526Icelandair
Sun, May 3 - Thu, May 7
Multiple Airlines Logo
7:25 pm - 12:20 am
ORD
-
EDI
22h 55m
2 stops
Multiple Airlines Logo
10:55 am - 9:25 pm
EDI
-
ORD
16h 30m
2 stops
$528Multiple Airlines
Fri, May 1 - Wed, May 6
Multiple Airlines Logo
7:25 pm - 5:30 pm
ORD
-
EDI
16h 05m
2 stops
Multiple Airlines Logo
6:15 am - 6:15 pm
EDI
-
ORD
18h 00m
2 stops
$544Multiple Airlines
Mon, Apr 13 - Tue, Apr 21
TAP AIR PORTUGAL Logo
9:25 pm - 9:35 pm
ORD
-
LHR
19h 10m
1 stop
TAP AIR PORTUGAL Logo
7:50 pm - 4:00 pm
LHR
-
ORD
26h 10m
1 stop
$555TAP AIR PORTUGAL
Sun, Mar 22 - Tue, Mar 31
Scandinavian Airlines Logo
7:15 pm - 9:35 am
ORD
-
LHR
56h 20m
2 stops
Scandinavian Airlines Logo
6:40 am - 4:10 pm
LHR
-
ORD
39h 30m
2 stops
$556Scandinavian Airlines
Wed, Apr 22 - Sun, Apr 26
Scandinavian Airlines Logo
8:20 pm - 6:30 pm
ORD
-
LHR
17h 10m
1 stop
Scandinavian Airlines Logo
10:20 am - 5:45 pm
LHR
-
ORD
12h 25m
1 stop
$562Scandinavian Airlines
Mon, Mar 16 - Thu, Mar 19
TAP AIR PORTUGAL Logo
9:25 pm - 9:35 pm
ORD
-
LHR
19h 10m
1 stop
TAP AIR PORTUGAL Logo
7:50 pm - 4:00 pm
LHR
-
ORD
26h 10m
1 stop
$563TAP AIR PORTUGAL
Sun, Mar 22 - Tue, Mar 31
SWISS Logo
7:05 pm - 12:35 pm
ORD
-
LCY
11h 30m
1 stop
SWISS Logo
9:15 am - 3:55 pm
LCY
-
ORD
12h 40m
1 stop
$640SWISS
Mon, Aug 17 - Tue, Aug 25
SWISS Logo
7:05 pm - 5:25 pm
ORD
-
LCY
16h 20m
1 stop
SWISS Logo
9:15 am - 3:55 pm
LCY
-
ORD
12h 40m
1 stop
$644SWISS
Sun, Aug 16 - Tue, Sep 1

Delta flights from Illinois to United Kingdom

Our best Delta deals on Illinois to United Kingdom flight tickets
Delta
Mar 11
ORD2:10 pmChicago O'Hare Intl
11h 40m
1 stop
LHR6:50 amLondon Heathrow
Mar 18
LHR8:40 amLondon Heathrow
11h 40m
1 stop
ORD3:20 pmChicago O'Hare Intl
$651
Delta
Mar 3
ORD2:05 pmChicago O'Hare Intl
14h 25m
2 stops
LHR10:30 amLondon Heathrow
Mar 18
LHR8:40 amLondon Heathrow
11h 40m
1 stop
ORD3:20 pmChicago O'Hare Intl
$656
Delta
Mar 30
STL5:59 pmLambert-St Louis
13h 46m
2 stops
LHR1:45 pmLondon Heathrow
Apr 14
LHR8:40 amLondon Heathrow
18h 39m
2 stops
STL9:19 pmLambert-St Louis
$661

United Airlines flights from Illinois to United Kingdom

Our best United Airlines deals on Illinois to United Kingdom flight tickets
United Airlines
Mar 4
ORD5:55 pmChicago O'Hare Intl
17h 10m
1 stop
LHR5:05 pmLondon Heathrow
Mar 11
LHR6:50 amLondon Heathrow
11h 20m
1 stop
ORD1:10 pmChicago O'Hare Intl
$634
United Airlines
Mar 4
ORD3:45 pmChicago O'Hare Intl
8h 10m
LHR5:55 amLondon Heathrow
Mar 11
LHR6:50 amLondon Heathrow
11h 20m
1 stop
ORD1:10 pmChicago O'Hare Intl
$635
United Airlines
Mar 3
ORD10:35 amChicago O'Hare Intl
14h 35m
1 stop
LHR7:10 amLondon Heathrow
Mar 18
LHR6:50 amLondon Heathrow
11h 20m
1 stop
ORD1:10 pmChicago O'Hare Intl
$639

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 March 2, 2026.
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

Sat 4/4

7:25 pm-1:35 pm

1 stop12h 10m

Glasgow Intl

Fri 4/10

2:30 pm-9:25 pm

1 stop12h 55m

$510

ChicagoGlasgow

ORD - GLA

ORDGLA

Chicago O'Hare Intl

Sun 5/3

7:25 pm-1:25 pm

1 stop12h 00m

Glasgow Intl

Thu 5/7

2:20 pm-6:15 pm

1 stop9h 55m

$526

ChicagoEdinburgh

ORD - EDI

ORDEDI

Chicago O'Hare Intl

Fri 5/1

7:25 pm-12:20 am

2 stops22h 55m

Edinburgh Turnhouse

Wed 5/6

10:55 am-9:25 pm

2 stops16h 30m

$528

ChicagoEdinburgh

ORD - EDI

ORDEDI

Chicago O'Hare Intl

Mon 4/13

7:25 pm-5:30 pm

2 stops16h 05m

Edinburgh Turnhouse

Tue 4/21

6:15 am-6:15 pm

2 stops18h 00m

$544

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 3/22

9:25 pm-9:35 pm

1 stop19h 10m

London Heathrow

Tue 3/31

7:50 pm-4:00 pm

1 stop26h 10m

$555

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Wed 4/22

7:15 pm-9:35 am

2 stops56h 20m

London Heathrow

Sun 4/26

6:40 am-4:10 pm

2 stops39h 30m

$556

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Mon 3/16

8:20 pm-6:30 pm

1 stop17h 10m

London Heathrow

Thu 3/19

10:20 am-5:45 pm

1 stop12h 25m

$562

ChicagoLondon

ORD - LHR

ORDLHR

Chicago O'Hare Intl

Sun 3/22

9:25 pm-9:35 pm

1 stop19h 10m

London Heathrow

Tue 3/31

7:50 pm-4:00 pm

1 stop26h 10m

$563

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Mon 8/17

7:05 pm-12:35 pm

1 stop11h 30m

London City

Tue 8/25

9:15 am-3:55 pm

1 stop12h 40m

$640

ChicagoLondon

ORD - LCY

ORDLCY

Chicago O'Hare Intl

Sun 8/16

7:05 pm-5:25 pm

1 stop16h 20m

London City

Tue 9/1

9:15 am-3:55 pm

1 stop12h 40m

$644

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, September 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 $656. If you aren’t able to travel to United Kingdom during the month of September, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $656.

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 $759. The most expensive day to fly to United Kingdom is Saturday, with ticket prices averaging around $932.

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 evening. momondo users have found flights departing from Illinois to United Kingdom in the evening for as low as $811. 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 $835. 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 $784 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 50% 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

$400

Fastest flight time

7h 40m

Direct flights

Every day

Airports in United Kingdom

1,286 airports
The best one-way flight to United Kingdom from Illinois in the past 72 hours is $400. The best round-trip flight deal from Illinois to United Kingdom found on momondo in the last 72 hours is $711.
The fastest flight from Illinois to United Kingdom takes 7h 40m
Direct flights go from Illinois to United Kingdom every day.
There are 1,286 airports in United Kingdom. From Illinois there are direct flights to London Heathrow (LHR), Edinburgh Turnhouse (EDI).
Search flight deals

  • 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
2,895 reviews
Search JetBlue flights
SWISSPriceFrom $257Free CancellationRating
7.6
1,889 reviews
Search SWISS flights
Scandinavian AirlinesPriceFrom $321Free CancellationRating
7.3
1,702 reviews
Search Scandinavian Airlines flights
DeltaPriceFrom $345Free CancellationRating
7.9
8,242 reviews
Search Delta flights
TAP AIR PORTUGALPriceFrom $427Free CancellationRating
7.1
2,155 reviews
Search TAP AIR PORTUGAL flights
IcelandairPriceFrom $467Free CancellationRating
7.1
617 reviews
Search Icelandair flights
Aer LingusPriceFrom $481Free CancellationRating
7.2
1,464 reviews
Search Aer Lingus flights
FinnairPriceFrom $516Free CancellationRating
7.6
1,371 reviews
Search Finnair flights
Alaska AirlinesPriceFrom $522Free CancellationRating
8.0
11,978 reviews
Search Alaska Airlines flights
Air EuropaPriceFrom $533Free CancellationRating
6.9
590 reviews
Search Air Europa 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 $343
Flights to Manchesterfrom $341
Flights to Edinburghfrom $399
Flights to Glasgowfrom $352
Flights to Birminghamfrom $430
Flights to Newcastle upon Tynefrom $549
Flights to Belfastfrom $516
Flights to Bristolfrom $458
Flights to Invernessfrom $421
Flights to Liverpoolfrom $497
Flights to Leedsfrom $464
Flights to Aberdeenfrom $516