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Cheap flights from London to Illinois from $358

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 1/24. 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 to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:00 pm - 11:33 pm
LGW
-
STL
15h 33m1 stop
Multiple Airlines Logo
10:16 am - 10:00 am
STL
-
LGW
17h 44m1 stop
$470Multiple Airlines
jue., ene. 22 - lun., ene. 26
Multiple Airlines Logo
2:00 pm - 11:33 pm
LGW
-
STL
15h 33m1 stop
Multiple Airlines Logo
11:18 am - 10:00 am
STL
-
LGW
16h 42m1 stop
$509Multiple Airlines
vie., ene. 30 - vie., feb. 6
Multiple Airlines Logo
2:00 pm - 11:33 pm
LGW
-
STL
15h 33m1 stop
Multiple Airlines Logo
11:18 am - 10:00 am
STL
-
LGW
16h 42m1 stop
$552Multiple Airlines
vie., ene. 30 - vie., feb. 6
Icelandair Logo
8:35 pm - 6:20 pm
LHR
-
ORD
26h 45m1 stop
Icelandair Logo
7:25 pm - 11:55 am
ORD
-
LHR
10h 30m1 stop
$602Icelandair
lun., mar. 16 - mié., abr. 22
Austrian Airlines Logo
4:00 pm - 11:59 pm
LHR
-
STL
13h 59m1 stop
Austrian Airlines Logo
11:22 am - 8:25 am
STL
-
LHR
15h 03m1 stop
$608Austrian Airlines
jue., ene. 22 - lun., ene. 26
British Airways Logo
9:10 am - 7:15 pm
LCY
-
ORD
16h 05m1 stop
British Airways Logo
9:00 pm - 6:35 pm
ORD
-
LCY
15h 35m1 stop
$611British Airways
jue., ene. 22 - lun., ene. 26
British Airways Logo
8:50 am - 3:55 pm
LHR
-
ORD
37h 05m2 stops
British Airways Logo
12:07 pm - 9:05 am
ORD
-
LHR
14h 58m1 stop
$611British Airways
jue., may. 7 - lun., may. 11
United Airlines Logo
11:10 am - 10:58 pm
LHR
-
STL
17h 48m2 stops
United Airlines Logo
9:57 am - 6:40 am
STL
-
LHR
14h 43m2 stops
$620United Airlines
dom., feb. 1 - dom., feb. 8
Icelandair Logo
1:00 pm - 6:15 pm
LGW
-
ORD
11h 15m1 stop
Icelandair Logo
7:25 pm - 11:45 am
ORD
-
LGW
10h 20m1 stop
$621Icelandair
jue., may. 7 - lun., may. 11
United Airlines Logo
8:30 am - 7:27 pm
LHR
-
STL
16h 57m2 stops
United Airlines Logo
1:15 pm - 9:10 am
STL
-
LHR
13h 55m2 stops
$622United Airlines
jue., ene. 22 - lun., ene. 26

Icelandair flights from London to Illinois

Our best Icelandair deals on London to Illinois flight tickets
Icelandair
Mar 16
LHR8:35 pmLondon Heathrow
26h 45m
1 stop
ORD6:20 pmChicago O'Hare Intl
Apr 22
ORD7:25 pmChicago O'Hare Intl
10h 30m
1 stop
LHR11:55 amLondon Heathrow
$602
Find similar
Icelandair
May 7
LGW1:00 pmLondon Gatwick
11h 15m
1 stop
ORD6:15 pmChicago O'Hare Intl
May 11
ORD7:25 pmChicago O'Hare Intl
10h 20m
1 stop
LGW11:45 amLondon Gatwick
$621
Find similar
Icelandair
Feb 18
LGW11:55 amLondon Gatwick
11h 25m
1 stop
ORD5:20 pmChicago O'Hare Intl
Mar 18
ORD7:30 pmChicago O'Hare Intl
10h 25m
1 stop
LGW10:55 amLondon Gatwick
$622
Find similar

Scandinavian Airlines flights from London to Illinois

Our best Scandinavian Airlines deals on London to Illinois flight tickets
Scandinavian Airlines
Mar 2
LHR10:20 amLondon Heathrow
12h 25m
1 stop
ORD4:45 pmChicago O'Hare Intl
Mar 10
ORD1:37 pmChicago O'Hare Intl
23h 53m
2 stops
LHR6:30 pmLondon Heathrow
$606
Find similar
Scandinavian Airlines
Feb 21
LHR10:20 amLondon Heathrow
12h 25m
1 stop
ORD4:45 pmChicago O'Hare Intl
Mar 3
ORD10:36 amChicago O'Hare Intl
25h 54m
2 stops
LHR6:30 pmLondon Heathrow
$607
Find similar
Scandinavian Airlines
Jan 20
LHR7:50 pmLondon Heathrow
26h 55m
2 stops
ORD4:45 pmChicago O'Hare Intl
Apr 7
ORD10:40 amChicago O'Hare Intl
16h 40m
2 stops
LHR9:20 amLondon Heathrow
$608
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 diciembre 18, 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

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

jue. 1/22

2:00 pm-11:33 pm

1 stop15h 33m

Lambert-St Louis

lun. 1/26

10:16 am-10:00 am

1 stop17h 44m

$470

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

vie. 1/30

2:00 pm-11:33 pm

1 stop15h 33m

Lambert-St Louis

vie. 2/6

11:18 am-10:00 am

1 stop16h 42m

$509

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

vie. 1/30

2:00 pm-11:33 pm

1 stop15h 33m

Lambert-St Louis

vie. 2/6

11:18 am-10:00 am

1 stop16h 42m

$552

LondonChicago

LHR - ORD

LHRORD

London Heathrow

lun. 3/16

8:35 pm-6:20 pm

1 stop26h 45m

Chicago O'Hare Intl

mié. 4/22

7:25 pm-11:55 am

1 stop10h 30m

$602

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 1/22

4:00 pm-11:59 pm

1 stop13h 59m

Lambert-St Louis

lun. 1/26

11:22 am-8:25 am

1 stop15h 03m

$608

LondonChicago

LCY - ORD

LCYORD

London City

jue. 1/22

9:10 am-7:15 pm

1 stop16h 05m

Chicago O'Hare Intl

lun. 1/26

9:00 pm-6:35 pm

1 stop15h 35m

$611

LondonChicago

LHR - ORD

LHRORD

London Heathrow

jue. 5/7

8:50 am-3:55 pm

2 stops37h 05m

Chicago O'Hare Intl

lun. 5/11

12:07 pm-9:05 am

1 stop14h 58m

$611

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

dom. 2/1

11:10 am-10:58 pm

2 stops17h 48m

Lambert-St Louis

dom. 2/8

9:57 am-6:40 am

2 stops14h 43m

$620

LondonChicago

LGW - ORD

LGWORD

London Gatwick

jue. 5/7

1:00 pm-6:15 pm

1 stop11h 15m

Chicago O'Hare Intl

lun. 5/11

7:25 pm-11:45 am

1 stop10h 20m

$621

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

jue. 1/22

8:30 am-7:27 pm

2 stops16h 57m

Lambert-St Louis

lun. 1/26

1:15 pm-9:10 am

2 stops13h 55m

$622

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 $575, 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 $582.

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 $769. Flights from London to Illinois on a Monday will generally be more expensive and average around $880. 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 $910.

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 $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 for as low as $696 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 1% 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

$633

Fastest flight time

8h 25m

Direct flights

Every day

Airports in Illinois

98 airports
The best one-way flight to Illinois from London in the past 72 hours is $633. The best round-trip flight deal from London to Illinois found on momondo in the last 72 hours is $731.
The fastest flight from London to Illinois takes 8h 25m
Direct flights go from London to Illinois every day.
There are 98 airports in Illinois. From London 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 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
Aer LingusPriceFrom $446Free CancellationRating
7.2
1,399 reviews
Search Aer Lingus flights
IcelandairPriceFrom $451Free CancellationRating
7.0
591 reviews
Search Icelandair flights
United AirlinesPriceFrom $485Free CancellationRating
7.4
9,094 reviews
Search United Airlines flights
Austrian AirlinesPriceFrom $530Free CancellationRating
7.6
879 reviews
Search Austrian Airlines flights
British AirwaysPriceFrom $554Free CancellationRating
6.7
7,586 reviews
Search British Airways flights
TAP AIR PORTUGALPriceFrom $558Free CancellationRating
7.2
2,092 reviews
Search TAP AIR PORTUGAL flights
IberiaPriceFrom $558Free CancellationRating
7.0
3,053 reviews
Search Iberia flights
American AirlinesPriceFrom $572Free CancellationRating
7.2
11,054 reviews
Search American Airlines flights
FinnairPriceFrom $625Free CancellationRating
7.6
1,338 reviews
Search Finnair flights
LufthansaPriceFrom $720Free CancellationRating
6.8
7,637 reviews
Search Lufthansa 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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