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

SWISS, United Airlines, and Air Canada are the most popular carriers operating from London Heathrow to Illinois

What airlines fly to Illinois?

British Airways, Lufthansa and American Airlines 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 48% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 8 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 8 operators available for flights from London Heathrow Airport to Illinois as of July 2026.

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.

$474 Cheap Flights from London Heathrow Airport to Illinois in 2026

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

As of July 2026, there are 53 flights per day flying from London Heathrow Airport to Illinois. The most common time of day flights depart is 11:00AM, with 50% of flights taking off at noon.

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 372 per week as of July 2026. The most frequent departure day is Wed, with 15% of weekly flights leaving on this day.

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Find the cheapest flights from London Heathrow Airport to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

1:05 pm - 6:15 pm

LHR

ORD

11h 10m

1 stop

7:25 pm - 11:55 am

ORD

LHR

10h 30m

1 stop

$656Icelandair

Thu, Sep 24 - Mon, Oct 5

12:15 pm - 5:20 pm

LHR

ORD

11h 05m

1 stop

7:25 pm - 8:20 pm

ORD

LHR

18h 55m

1 stop

$656Icelandair

Mon, Jan 11 - Tue, May 18

2:05 pm - 10:15 am

LHR

ORD

26h 10m

1 stop

5:07 pm - 10:25 am

ORD

LHR

11h 18m

1 stop

$659Lufthansa

Sat, Sep 26 - Sat, Oct 3

2:05 pm - 10:15 am

LHR

ORD

26h 10m

1 stop

9:30 pm - 11:55 am

ORD

LHR

8h 25mnonstop

$659Lufthansa

Sat, Sep 26 - Sat, Oct 3

8:40 am - 3:55 pm

LHR

ORD

13h 15m

1 stop

6:15 pm - 10:40 am

ORD

LHR

10h 25m

1 stop

$662United Airlines

Wed, Sep 9 - Wed, Sep 9

10:20 am - 9:25 pm

LHR

ORD

17h 05m

2 stops

10:25 pm - 9:40 pm

ORD

LHR

17h 15m

2 stops

$667Multiple Airlines

Wed, Oct 7 - Sun, Oct 11

6:30 pm - 3:30 pm

LHR

ORD

27h 00m

1 stop

8:10 pm - 5:30 pm

ORD

LHR

15h 20m

1 stop

$669TAP AIR PORTUGAL

Thu, Dec 17 - Fri, Jan 1

7:40 am - 10:45 am

LHR

ORD

9h 05mnonstop

1:14 pm - 10:50 am

ORD

LHR

15h 36m

1 stop

$680Austrian Airlines

Tue, Nov 3 - Tue, Nov 3

8:40 am - 12:35 pm

LHR

ORD

33h 55m

1 stop

10:50 am - 6:55 am

ORD

LHR

14h 05m

1 stop

$688United Airlines

Mon, Sep 21 - Wed, Sep 23

12:15 pm - 6:35 pm

LHR

ORD

12h 20m

1 stop

9:30 pm - 11:55 am

ORD

LHR

8h 25mnonstop

$707Austrian Airlines

Wed, Sep 9 - Wed, Sep 9

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Icelandair flights from London Heathrow Airport to Illinois

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

Icelandair

Sep 24

LHR1:05 pmLondon Heathrow

11h 10m

1 stop

ORD6:15 pmChicago O'Hare Intl

Oct 5

ORD7:25 pmChicago O'Hare Intl

10h 30m

1 stop

LHR11:55 amLondon Heathrow

$656

Icelandair

Sep 7

LHR9:25 pmLondon Heathrow

26h 50m

1 stop

ORD6:15 pmChicago O'Hare Intl

Sep 21

ORD7:25 pmChicago O'Hare Intl

18h 55m

1 stop

LHR8:20 pmLondon Heathrow

$657

Icelandair

Sep 9

LHR1:05 pmLondon Heathrow

14h 20m

1 stop

ORD9:25 pmChicago O'Hare Intl

Sep 16

ORD7:25 pmChicago O'Hare Intl

18h 55m

1 stop

LHR8:20 pmLondon Heathrow

$661

Austrian Airlines flights from London Heathrow Airport to Illinois

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

Austrian Airlines

Sep 9

LHR12:15 pmLondon Heathrow

12h 20m

1 stop

ORD6:35 pmChicago O'Hare Intl

Sep 9

ORD9:30 pmChicago O'Hare Intl

8h 25m

LHR11:55 amLondon Heathrow

$707

Austrian Airlines

Aug 3

LHR11:05 amLondon Heathrow

9h 05m

ORD2:10 pmChicago O'Hare Intl

Aug 4

ORD11:07 amChicago O'Hare Intl

13h 48m

1 stop

LHR6:55 amLondon Heathrow

$892

momondo Fare Finder

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

Cheapest round-trip

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 9/24

1:05 pm-6:15 pm

1 stop11h 10m

Chicago O'Hare Intl

Mon 10/5

7:25 pm-11:55 am

1 stop10h 30m

$656

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 1/11

12:15 pm-5:20 pm

1 stop11h 05m

Chicago O'Hare Intl

Tue 5/18

7:25 pm-8:20 pm

1 stop18h 55m

$656

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 9/26

2:05 pm-10:15 am

1 stop26h 10m

Chicago O'Hare Intl

Sat 10/3

5:07 pm-10:25 am

1 stop11h 18m

$659

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 9/26

2:05 pm-10:15 am

1 stop26h 10m

Chicago O'Hare Intl

Sat 10/3

9:30 pm-11:55 am

Nonstop8h 25m

$659

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/9

8:40 am-3:55 pm

1 stop13h 15m

Chicago O'Hare Intl

Wed 9/9

6:15 pm-10:40 am

1 stop10h 25m

$662

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 10/7

10:20 am-9:25 pm

2 stops17h 05m

Chicago O'Hare Intl

Sun 10/11

10:25 pm-9:40 pm

2 stops17h 15m

$667

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 12/17

6:30 pm-3:30 pm

1 stop27h 00m

Chicago O'Hare Intl

Fri 1/1

8:10 pm-5:30 pm

1 stop15h 20m

$669

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 11/3

7:40 am-10:45 am

Nonstop9h 05m

Chicago O'Hare Intl

Tue 11/3

1:14 pm-10:50 am

1 stop15h 36m

$680

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 9/21

8:40 am-12:35 pm

1 stop33h 55m

Chicago O'Hare Intl

Wed 9/23

10:50 am-6:55 am

1 stop14h 05m

$688

Quickest round-trip

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/9

12:15 pm-6:35 pm

1 stop12h 20m

Chicago O'Hare Intl

Wed 9/9

9:30 pm-11:55 am

Nonstop8h 25m

$707

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

Airlines

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 $615, 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 $682.

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 Thursday when prices can be found for as low as $896. Flights from London Heathrow Airport to Illinois on a Saturday will generally be more expensive and average around $1,052. 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 at noon. Flights from London Heathrow Airport to Illinois during this time can be as low as $906. Flights in the morning are often more expensive with an average ticket price of $946.

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 from London Heathrow Airport 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 $832 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 $773 on momondo.

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

There are 4 cabin classes available to choose from on London Heathrow Airport 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	$741
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 $741. The best round-trip flight deal from London Heathrow Airport to Illinois found on momondo in the last 72 hours is $863.

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).

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Frequently asked questions about flying from London Heathrow Airport to Illinois

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 8 operators available for flights from London Heathrow Airport to Illinois as of July 2026.
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 28.59% of all bookings. The subsequent popular models are Boeing 787-9 Dreamliner at 27.25%, Boeing 777 at 14.00%, and Boeing 787-10 Dreamliner at 9.23%.

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
Icelandair	PriceFrom $421	Free Cancellation	Rating 7.0 716 reviews	Search Icelandair flights
Aer Lingus	PriceFrom $446	Free Cancellation	Rating 7.3 1,682 reviews	Search Aer Lingus flights
Scandinavian Airlines	PriceFrom $467	Free Cancellation	Rating 7.4 1,908 reviews	Search Scandinavian Airlines flights
Austrian Airlines	PriceFrom $530	Free Cancellation	Rating 7.6 950 reviews	Search Austrian Airlines flights
United Airlines	PriceFrom $572	Free Cancellation	Rating 7.4 10,046 reviews	Search United Airlines flights
British Airways	PriceFrom $574	Free Cancellation	Rating 6.7 8,128 reviews	Search British Airways flights
American Airlines	PriceFrom $583	Free Cancellation	Rating 7.1 11,842 reviews	Search American Airlines flights
Lufthansa	PriceFrom $703	Free Cancellation	Rating 6.8 8,166 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.