What is the cheapest airline that flies from London Heathrow to Illinois?

United Airlines, Delta, and KLM are the most popular carriers operating from London Heathrow to Illinois

What airlines fly to Illinois?

British Airways, American Airlines and Aer Lingus are the top three most popular airlines that fly to Illinois from London Heathrow Airport according to our data. British Airways is the first choice among our users, with 55% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 11 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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

There are 11 operators available for flights from London Heathrow Airport to Illinois as of November 2025.

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.

$497 Cheap Flights from London Heathrow Airport to Illinois in 2025/26

Q: How many flights depart from London Heathrow Airport to Illinois on average per week?

The number of flights available between London Heathrow Airport and Illinois is 233 per week as of November 2025. The most frequent departure day is Sun, with 19% of weekly flights leaving on this day.

Q: How many flights depart from London Heathrow Airport to Illinois on average per day?

As of November 2025, there are 33 flights per day flying from London Heathrow Airport to Illinois. The most common time of day flights depart is 2:00PM, with 59% of flights taking off in the afternoon.

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Cheap round-trip flights

Enter your travel dates to find the best prices.

7:05 am - 4:45 pmLHR-ORD

15h 40m2 stops

7:20 pm - 4:00 pmORD-LHR

14h 40m1 stop

$533Scandinavian Airlines

Find Deal

Mon, Nov 17 - Mon, Nov 24

5:00 pm - 4:45 pmLHR-ORD

29h 45m1 stop

7:20 pm - 4:25 pmORD-LHR

15h 05m2 stops

$534Scandinavian Airlines

Find Deal

Thu, Jan 8 - Mon, Jan 12

7:05 am - 4:45 pmLHR-ORD

15h 40m2 stops

7:20 pm - 4:25 pmORD-LHR

15h 05m2 stops

$535Scandinavian Airlines

Find Deal

Thu, Nov 27 - Sun, Nov 30

9:55 am - 6:43 pmLHR-STL

14h 48m1 stop

5:40 pm - 11:35 amSTL-LHR

11h 55m1 stop

$717British Airways

Find Deal

Wed, Dec 3 - Tue, Dec 9

1:20 pm - 11:12 pmLHR-STL

39h 52m2 stops

5:20 pm - 6:50 amSTL-LHR

31h 30m1 stop

$728British Airways

Find Deal

Sun, Feb 1 - Sun, Feb 8

11:00 am - 6:03 pmLHR-STL

13h 03m1 stop

4:43 pm - 10:25 amSTL-LHR

12h 42m1 stop

$761American Airlines

Find Deal

Thu, Mar 5 - Mon, Mar 9

12:10 pm - 11:56 pmLHR-STL

17h 46m2 stops

6:00 am - 8:05 amSTL-LHR

20h 05m2 stops

$808Aer Lingus

Find Deal

Mon, Nov 24 - Mon, Dec 1

4:10 pm - 5:57 pmLHR-PIA

31h 47m2 stops

6:10 am - 10:00 amPIA-LHR

21h 50m1 stop

$1,080American Airlines

Find Deal

Fri, Feb 20 - Tue, Feb 24

6:30 am - 4:50 pmLHR-PIA

16h 20m2 stops

1:25 pm - 8:25 amPIA-LHR

13h 00m2 stops

$1,094United Airlines

Find Deal

Fri, Feb 20 - Tue, Feb 24

6:30 am - 4:50 pmLHR-PIA

16h 20m2 stops

10:51 am - 6:20 amPIA-LHR

13h 29m2 stops

$1,095United Airlines

Find Deal

Fri, Feb 20 - Tue, Feb 24

Scandinavian Airlines flights from London Heathrow Airport to Illinois

Our best Scandinavian Airlines deals on London Heathrow Airport to Illinois flight tickets

Scandinavian Airlines

Nov 17

LHR7:05 amLondon Heathrow

15h 40m

2 stops

ORD4:45 pmChicago O'Hare Intl

Nov 24

ORD7:20 pmChicago O'Hare Intl

14h 40m

1 stop

LHR4:00 pmLondon Heathrow

$533

Find similar

Scandinavian Airlines

Jan 8

LHR5:00 pmLondon Heathrow

29h 45m

1 stop

ORD4:45 pmChicago O'Hare Intl

Jan 12

ORD7:20 pmChicago O'Hare Intl

15h 05m

2 stops

LHR4:25 pmLondon Heathrow

$534

Find similar

Scandinavian Airlines

Nov 27

LHR7:05 amLondon Heathrow

15h 40m

2 stops

ORD4:45 pmChicago O'Hare Intl

Nov 30

ORD7:20 pmChicago O'Hare Intl

15h 05m

2 stops

LHR4:25 pmLondon Heathrow

$535

Find similar

Finnair flights from London Heathrow Airport to Illinois

Our best Finnair deals on London Heathrow Airport to Illinois flight tickets

Finnair

Nov 15

LHR2:10 pmLondon Heathrow

8h 50m

ORD5:00 pmChicago O'Hare Intl

Jan 13

ORD6:25 pmChicago O'Hare Intl

7h 50m

LHR8:15 amLondon Heathrow

$550

Find similar

Finnair

Nov 15

LHR2:10 pmLondon Heathrow

8h 50m

ORD5:00 pmChicago O'Hare Intl

Nov 29

ORD8:40 pmChicago O'Hare Intl

7h 45m

LHR10:25 amLondon Heathrow

$589

Find similar

Finnair

Jan 13

LHR8:20 amLondon Heathrow

17h 09m

1 stop

STL7:29 pmLambert-St Louis

Jan 23

STL2:54 pmLambert-St Louis

12h 46m

2 stops

LHR9:40 amLondon Heathrow

$747

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from London Heathrow Airport to Illinois that are best for you.

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Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 11/17

7:05 am-4:45 pm

2 stops15h 40m

Chicago O'Hare Intl

Mon 11/24

7:20 pm-4:00 pm

1 stop14h 40m

$533

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 1/8

5:00 pm-4:45 pm

1 stop29h 45m

Chicago O'Hare Intl

Mon 1/12

7:20 pm-4:25 pm

2 stops15h 05m

$534

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 11/27

7:05 am-4:45 pm

2 stops15h 40m

Chicago O'Hare Intl

Sun 11/30

7:20 pm-4:25 pm

2 stops15h 05m

$535

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 12/3

9:55 am-6:43 pm

1 stop14h 48m

Lambert-St Louis

Tue 12/9

5:40 pm-11:35 am

1 stop11h 55m

$717

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 2/1

1:20 pm-11:12 pm

2 stops39h 52m

Lambert-St Louis

Sun 2/8

5:20 pm-6:50 am

1 stop31h 30m

$728

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 3/5

11:00 am-6:03 pm

1 stop13h 03m

Lambert-St Louis

Mon 3/9

4:43 pm-10:25 am

1 stop12h 42m

$761

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 11/24

12:10 pm-11:56 pm

2 stops17h 46m

Lambert-St Louis

Mon 12/1

6:00 am-8:05 am

2 stops20h 05m

$808

LondonPeoria

LHR - PIA

LHRPIA

London Heathrow

Fri 2/20

4:10 pm-5:57 pm

2 stops31h 47m

Greater Peoria

Tue 2/24

6:10 am-10:00 am

1 stop21h 50m

$1,080

LondonPeoria

LHR - PIA

LHRPIA

London Heathrow

Fri 2/20

6:30 am-4:50 pm

2 stops16h 20m

Greater Peoria

Tue 2/24

1:25 pm-8:25 am

2 stops13h 00m

$1,094

LondonPeoria

LHR - PIA

LHRPIA

London Heathrow

Fri 2/20

6:30 am-4:50 pm

2 stops16h 20m

Greater Peoria

Tue 2/24

10:51 am-6:20 am

2 stops13h 29m

$1,095

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

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Other information

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 $597, 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 $600.

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 $779. Flights from London Heathrow Airport to Illinois on a Sunday will generally be more expensive and average around $889. 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 Heathrow Airport 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 $920.

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 $733 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.

Can stopping save me money on London Heathrow Airport to Illinois flights?

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to Illinois.

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	$627
Fastest flight time	8h 35m
Direct flights	Every day
Airports in Illinois	1 airport

The best one-way flight to Illinois from London Heathrow Airport in the past 72 hours is $627. The best round-trip flight deal from London Heathrow Airport to Illinois found on momondo in the last 72 hours is $794.

The fastest flight from London Heathrow Airport to Illinois takes 8h 35m

Direct flights go from London Heathrow Airport to Illinois every day.

There is 1 airport near Illinois: Chicago O'Hare Intl (ORD)

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?
There are 11 operators available for flights from London Heathrow Airport to Illinois as of November 2025.
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?
momondo data reveals that the most frequently booked plane model on the route from London Heathrow Airport to Illinois is Boeing 767-300, representing 43.38% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 14.40%, Boeing 777 at 13.79%, and Boeing 787-9 Dreamliner at 5.20%.

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 Lingus	PriceFrom $446	Free Cancellation	Rating 7.2 1,365 reviews	Search Aer Lingus flights
Icelandair	PriceFrom $451	Free Cancellation	Rating 7.1 568 reviews	Search Icelandair flights
United Airlines	PriceFrom $485	Free Cancellation	Rating 7.4 8,997 reviews	Search United Airlines flights
Austrian Airlines	PriceFrom $530	Free Cancellation	Rating 7.6 862 reviews	Search Austrian Airlines flights
British Airways	PriceFrom $553	Free Cancellation	Rating 6.7 7,494 reviews	Search British Airways flights
TAP AIR PORTUGAL	PriceFrom $558	Free Cancellation	Rating 7.1 2,044 reviews	Search TAP AIR PORTUGAL flights
American Airlines	PriceFrom $572	Free Cancellation	Rating 7.2 11,036 reviews	Search American Airlines flights
Iberia	PriceFrom $599	Free Cancellation	Rating 7.0 3,005 reviews	Search Iberia flights
Finnair	PriceFrom $625	Free Cancellation	Rating 7.6 1,335 reviews	Search Finnair flights
Brussels Airlines	PriceFrom $633	Free Cancellation	Rating 7.2 369 reviews	Search Brussels Airlines 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.

An easier way to manage your Illinois trip

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Popular cities in Illinois

Flights to New Yorkfrom $49

Flights to Los Angelesfrom $49

Flights to Miamifrom $49

Flights to Chicagofrom $54

Flights to Orlandofrom $47

Flights to Las Vegasfrom $49

Flights to San Franciscofrom $54

Flights to Washington, D.C.from $54

Flights to Bostonfrom $40

Flights to Atlantafrom $40

Flights to Dallasfrom $49

Flights to Seattlefrom $68

Cheap flights from London Heathrow Airport to Illinois from $497

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Big names and deals

Filter for what you want

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Find the cheapest flights from London Heathrow Airport to Illinois

Cheap round-trip flights

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Cheap last minute flights

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Scandinavian Airlines flights from London Heathrow Airport to Illinois

Our best Scandinavian Airlines deals on London Heathrow Airport to Illinois flight tickets

Finnair flights from London Heathrow Airport to Illinois

Our best Finnair deals on London Heathrow Airport to Illinois flight tickets

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Use the filters below to find and compare flights from London Heathrow Airport to Illinois that are best for you.

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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?

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

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 Heathrow Airport 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 $920.

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?

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.

Can stopping save me money on London Heathrow Airport to Illinois flights?

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to Illinois.

What is the cheapest airline that flies from London Heathrow to Illinois?

United Airlines, Delta, and KLM are the most popular carriers operating from London Heathrow to Illinois

What airlines fly to Illinois?

How many flights depart from London Heathrow Airport to Illinois on average per day?

As of November 2025, there are 33 flights per day flying from London Heathrow Airport to Illinois. The most common time of day flights depart is 2:00PM, with 59% of flights taking off in the afternoon.

How many flights depart from London Heathrow Airport to Illinois on average per week?

The number of flights available between London Heathrow Airport and Illinois is 233 per week as of November 2025. The most frequent departure day is Sun, with 19% of weekly flights leaving on this day.

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

Fastest flight time

Direct flights

Airports in Illinois

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

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?

What documentation or ID do you need to fly to Illinois?

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

Why use momondo?

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

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

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

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

An easier way to manage your Illinois trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Illinois

Popular cities in Illinois

Popular flights according to clicks in the last 7 days on momondo