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Cheap flights from London Heathrow Airport to Illinois from $462

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 Heathrow Airport to Illinois departing on 3/31. 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 London Heathrow Airport to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
TAP AIR PORTUGAL Logo
6:30 pm - 3:25 pm
LHR
-
ORD
26h 55m
1 stop
TAP AIR PORTUGAL Logo
8:25 pm - 9:35 pm
ORD
-
LHR
19h 10m
1 stop
$532TAP AIR PORTUGAL
Thu, Feb 26 - Sun, Mar 1
Icelandair Logo
12:15 pm - 5:20 pm
LHR
-
ORD
11h 05m
1 stop
Icelandair Logo
6:30 pm - 7:30 pm
ORD
-
LHR
19h 00m
1 stop
$534Icelandair
Thu, Feb 19 - Tue, Feb 24
Scandinavian Airlines Logo
7:30 pm - 5:45 pm
LHR
-
ORD
27h 15m
1 stop
Scandinavian Airlines Logo
8:20 pm - 6:30 pm
ORD
-
LHR
17h 10m
1 stop
$535Scandinavian Airlines
Sun, Mar 8 - Thu, Mar 19
British Airways Logo
10:15 am - 7:29 pm
LHR
-
STL
14h 14m
1 stop
British Airways Logo
2:19 pm - 6:55 am
STL
-
LHR
11h 36m
1 stop
$717British Airways
Mon, Mar 9 - Mon, Mar 23
British Airways Logo
11:45 am - 6:52 pm
LHR
-
STL
13h 07m
1 stop
British Airways Logo
2:29 pm - 6:55 am
STL
-
LHR
11h 26m
1 stop
$723British Airways
Wed, Mar 4 - Wed, Mar 11
Finnair Logo
5:00 pm - 11:29 am
LHR
-
STL
23h 29m
2 stops
Finnair Logo
11:22 am - 12:05 pm
STL
-
LHR
19h 43m
1 stop
$728Finnair
Mon, Mar 9 - Mon, Mar 23
Finnair Logo
12:35 pm - 11:48 pm
LHR
-
STL
17h 13m
1 stop
Finnair Logo
8:00 am - 7:00 am
STL
-
LHR
18h 00m
2 stops
$734Finnair
Wed, Mar 4 - Wed, Mar 11
United Airlines Logo
11:10 am - 1:27 pm
LHR
-
PAH
32h 17m
2 stops
United Airlines Logo
2:05 pm - 7:30 am
PAH
-
LHR
35h 25m
1 stop
$1,025United Airlines
Thu, Feb 26 - Mon, Mar 2
United Airlines Logo
11:10 am - 1:27 pm
LHR
-
PAH
32h 17m
2 stops
United Airlines Logo
2:05 pm - 5:55 am
PAH
-
LHR
33h 50m
2 stops
$1,032United Airlines
Thu, Feb 26 - Mon, Mar 2
Lufthansa Logo
11:05 am - 4:50 pm
LHR
-
PIA
11h 45m
1 stop
Lufthansa Logo
8:20 pm - 4:40 pm
PIA
-
LHR
14h 20m
2 stops
$1,149Lufthansa
Fri, May 1 - Thu, May 14

JetBlue flights from London Heathrow Airport to Illinois

Our best JetBlue deals on London Heathrow Airport to Illinois flight tickets
JetBlue
Feb 20
LHR9:20 amLondon Heathrow
29h 50m
1 stop
ORD9:10 amChicago O'Hare Intl
Feb 23
ORD6:04 amChicago O'Hare Intl
21h 26m
1 stop
LHR9:30 amLondon Heathrow
$560
JetBlue
Mar 2
LHR8:05 amLondon Heathrow
20h 54m
1 stop
ORD10:59 pmChicago O'Hare Intl
Mar 4
ORD12:59 pmChicago O'Hare Intl
26h 41m
1 stop
LHR9:40 pmLondon Heathrow
$568
JetBlue
Feb 18
LHR7:25 amLondon Heathrow
22h 01m
1 stop
ORD11:26 pmChicago O'Hare Intl
Feb 21
ORD6:04 amChicago O'Hare Intl
32h 41m
1 stop
LHR8:45 pmLondon Heathrow
$593

Icelandair flights from London Heathrow Airport to Illinois

Our best Icelandair deals on London Heathrow Airport to Illinois flight tickets
Icelandair
Feb 19
LHR12:15 pmLondon Heathrow
11h 05m
1 stop
ORD5:20 pmChicago O'Hare Intl
Feb 24
ORD6:30 pmChicago O'Hare Intl
19h 00m
1 stop
LHR7:30 pmLondon Heathrow
$534
Icelandair
Feb 18
LHR8:35 pmLondon Heathrow
26h 45m
1 stop
ORD5:20 pmChicago O'Hare Intl
Feb 24
ORD6:30 pmChicago O'Hare Intl
10h 20m
1 stop
LHR10:50 amLondon Heathrow
$536
Icelandair
Feb 18
LHR8:35 pmLondon Heathrow
26h 45m
1 stop
ORD5:20 pmChicago O'Hare Intl
Mar 10
ORD7:30 pmChicago O'Hare Intl
19h 00m
1 stop
LHR7:30 pmLondon Heathrow
$538

momondo Fare Finder

 
Customize your flight search to find flights from London Heathrow Airport 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 February 6, 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 2/26

6:30 pm-3:25 pm

1 stop26h 55m

Chicago O'Hare Intl

Sun 3/1

8:25 pm-9:35 pm

1 stop19h 10m

$532

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 2/19

12:15 pm-5:20 pm

1 stop11h 05m

Chicago O'Hare Intl

Tue 2/24

6:30 pm-7:30 pm

1 stop19h 00m

$534

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sun 3/8

7:30 pm-5:45 pm

1 stop27h 15m

Chicago O'Hare Intl

Thu 3/19

8:20 pm-6:30 pm

1 stop17h 10m

$535

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 3/9

10:15 am-7:29 pm

1 stop14h 14m

Lambert-St Louis

Mon 3/23

2:19 pm-6:55 am

1 stop11h 36m

$717

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 3/4

11:45 am-6:52 pm

1 stop13h 07m

Lambert-St Louis

Wed 3/11

2:29 pm-6:55 am

1 stop11h 26m

$723

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 3/9

5:00 pm-11:29 am

2 stops23h 29m

Lambert-St Louis

Mon 3/23

11:22 am-12:05 pm

1 stop19h 43m

$728

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 3/4

12:35 pm-11:48 pm

1 stop17h 13m

Lambert-St Louis

Wed 3/11

8:00 am-7:00 am

2 stops18h 00m

$734

LondonPaducah

LHR - PAH

LHRPAH

London Heathrow

Thu 2/26

11:10 am-1:27 pm

2 stops32h 17m

Paducah Barkley Regional

Mon 3/2

2:05 pm-7:30 am

1 stop35h 25m

$1,025

LondonPaducah

LHR - PAH

LHRPAH

London Heathrow

Thu 2/26

11:10 am-1:27 pm

2 stops32h 17m

Paducah Barkley Regional

Mon 3/2

2:05 pm-5:55 am

2 stops33h 50m

$1,032

LondonPeoria

LHR - PIA

LHRPIA

London Heathrow

Fri 5/1

11:05 am-4:50 pm

1 stop11h 45m

Greater Peoria

Thu 5/14

8:20 pm-4:40 pm

2 stops14h 20m

$1,149

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 Heathrow Airport 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 Heathrow Airport is in February. Flight prices, which tend to average around $587, 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 $596.

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

The cheapest day to depart from London Heathrow Airport to Illinois is on a Wednesday when prices can be found for as low as $773. Flights from London Heathrow Airport to Illinois on a Monday will generally be more expensive and average around $884. 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 morning. Flights from London Heathrow Airport to Illinois during this time can be as low as $824. Flights in the afternoon are often more expensive with an average ticket price of $943.

What is the cheapest London Heathrow to Illinois flight route?

Fly from London Heathrow to Chicago O'Hare Intl for the best London Heathrow - 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 Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $726 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from London Heathrow Airport for as low as $693 on momondo.

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

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

Cheap London Heathrow Airport to Illinois flight deals and tips

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

Best Price Found

$635

Fastest flight time

8h 40m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from London Heathrow Airport in the past 72 hours is $635. The best round-trip flight deal from London Heathrow Airport to Illinois found on momondo in the last 72 hours is $653.
The fastest flight from London Heathrow Airport to Illinois takes 8h 40m
Direct flights go from London Heathrow Airport to Illinois every day.
There are 98 airports in Illinois. From London Heathrow Airport there are direct flights to Chicago O'Hare Intl (ORD), Lambert-St Louis (STL).
Search flight deals

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

    Prices for flights from London Heathrow Airport to Illinois refresh daily.

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

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

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from London Heathrow Airport 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 Heathrow Airport to Illinois?

Best airlines flying from London Heathrow Airport to Illinois

Compare and see reviews for airlines that fly from London Heathrow Airport to Illinois with momondo
Airline
Rating
Free Cancellation
Price
Aer LingusPriceFrom $446Free CancellationRating
7.2
1,445 reviews
Search Aer Lingus flights
IcelandairPriceFrom $477Free CancellationRating
7.1
606 reviews
Search Icelandair flights
United AirlinesPriceFrom $485Free CancellationRating
7.4
9,246 reviews
Search United Airlines flights
Austrian AirlinesPriceFrom $530Free CancellationRating
7.5
896 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom $550Free CancellationRating
6.7
7,719 reviews
Search British Airways flights
TAP AIR PORTUGALPriceFrom $558Free CancellationRating
7.1
2,135 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $558Free CancellationRating
7.0
3,106 reviews
Search Iberia flights
FinnairPriceFrom $576Free CancellationRating
7.6
1,357 reviews
Search Finnair flights
American AirlinesPriceFrom $579Free CancellationRating
7.2
11,244 reviews
Search American Airlines flights
LufthansaPriceFrom $618Free CancellationRating
6.8
7,769 reviews
Search Lufthansa flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Illinois. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for London to Illinois flights to just show those with flexible booking policies.

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

momondo provides multiple filters to help you find the best flight to Illinois from London. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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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