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

TAP AIR PORTUGAL is the most popular carrier 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 53% 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 July 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.

$353 Cheap Flights from London Heathrow Airport to Illinois in 2025

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

As of July 2025, there are 52 flights per day flying from London Heathrow Airport to Illinois. The most common time of day flights depart is 2:00PM, with 54% of flights taking off in the afternoon.

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 366 per week as of July 2025. The most frequent departure day is Mon, with 14% 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

9:30 am - 7:55 pmLHR-ORD

16h 25m1 stop

7:05 pm - 7:20 pmORD-LHR

18h 15m1 stop

$450

Find Deal

Tue, Sep 23 - Tue, Sep 30

11:05 am - 12:05 pmLHR-ORD

31h 00m1 stop

10:35 am - 9:00 pmORD-LHR

28h 25m1 stop

$461United Airlines

Find Deal

Thu, Sep 25 - Sat, Sep 27

9:00 am - 4:20 pmLHR-ORD

13h 20m1 stop

6:50 pm - 4:20 pmORD-LHR

15h 30m1 stop

$473SWISS

Find Deal

Wed, Nov 26 - Mon, Dec 1

9:30 am - 7:55 pmLHR-ORD

16h 25m1 stop

10:30 pm - 8:40 pmORD-LHR

16h 10m1 stop

$479Lufthansa

Find Deal

Wed, Sep 17 - Sun, Sep 28

11:10 am - 6:25 pmLHR-ORD

13h 15m1 stop

4:20 pm - 10:45 amORD-LHR

12h 25m1 stop

$483Lufthansa

Find Deal

Fri, Nov 28 - Wed, Dec 3

8:50 am - 2:00 pmLHR-ORD

11h 10m1 stop

9:15 pm - 1:55 pmORD-LHR

10h 40m1 stop

$486Aer Lingus

Find Deal

Sat, Sep 6 - Wed, Sep 10

8:50 am - 2:00 pmLHR-ORD

11h 10m1 stop

9:15 pm - 1:55 pmORD-LHR

10h 40m1 stop

$487Aer Lingus

Find Deal

Thu, Sep 18 - Sat, Oct 4

9:25 pm - 6:15 pmLHR-ORD

26h 50m1 stop

7:25 pm - 8:20 pmORD-LHR

18h 55m1 stop

$532Icelandair

Find Deal

Tue, Sep 23 - Sun, Oct 5

9:25 pm - 6:15 pmLHR-ORD

26h 50m1 stop

7:25 pm - 11:55 amORD-LHR

10h 30m1 stop

$535Icelandair

Find Deal

Fri, Sep 12 - Fri, Sep 19

2:45 pm - 11:59 pmLHR-EVV

15h 14m1 stop

10:37 am - 6:50 amEVV-LHR

14h 13m1 stop

$1,079American Airlines

Find Deal

Thu, Nov 13 - Fri, Nov 21

TAP AIR PORTUGAL flights from London Heathrow Airport to Illinois

Our best TAP AIR PORTUGAL deals on London Heathrow Airport to Illinois flight tickets

TAP AIR PORTUGAL

Nov 6

LHR7:55 pmLondon Heathrow

25h 20m

1 stop

ORD3:15 pmChicago O'Hare Intl

Nov 12

ORD7:10 pmChicago O'Hare Intl

14h 20m

1 stop

LHR3:30 pmLondon Heathrow

$510

Find similar

TAP AIR PORTUGAL

Sep 17

LHR1:45 pmLondon Heathrow

27h 10m

1 stop

ORD10:55 amChicago O'Hare Intl

Sep 28

ORD6:00 pmChicago O'Hare Intl

22h 00m

1 stop

LHR10:00 pmLondon Heathrow

$519

Find similar

TAP AIR PORTUGAL

Sep 17

LHR7:50 pmLondon Heathrow

21h 05m

1 stop

ORD10:55 amChicago O'Hare Intl

Sep 21

ORD6:00 pmChicago O'Hare Intl

34h 20m

1 stop

LHR10:20 amLondon Heathrow

$533

Find similar

Icelandair flights from London Heathrow Airport to Illinois

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

Icelandair

Sep 23

LHR9:25 pmLondon Heathrow

26h 50m

1 stop

ORD6:15 pmChicago O'Hare Intl

Oct 5

ORD7:25 pmChicago O'Hare Intl

18h 55m

1 stop

LHR8:20 pmLondon Heathrow

$532

Find similar

Icelandair

Sep 12

LHR9:25 pmLondon Heathrow

26h 50m

1 stop

ORD6:15 pmChicago O'Hare Intl

Sep 19

ORD7:25 pmChicago O'Hare Intl

10h 30m

1 stop

LHR11:55 amLondon Heathrow

$535

Find similar

Icelandair

Aug 27

LHR1:05 pmLondon Heathrow

11h 10m

1 stop

ORD6:15 pmChicago O'Hare Intl

Sep 8

ORD7:25 pmChicago O'Hare Intl

10h 30m

1 stop

LHR11:55 amLondon Heathrow

$536

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.

Fly from

Fly to

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 9/23

9:30 am-7:55 pm

1 stop16h 25m

Chicago O'Hare Intl

Tue 9/30

7:05 pm-7:20 pm

1 stop18h 15m

$450

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 9/25

11:05 am-12:05 pm

1 stop31h 00m

Chicago O'Hare Intl

Sat 9/27

10:35 am-9:00 pm

1 stop28h 25m

$461

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 11/26

9:00 am-4:20 pm

1 stop13h 20m

Chicago O'Hare Intl

Mon 12/1

6:50 pm-4:20 pm

1 stop15h 30m

$473

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 9/17

9:30 am-7:55 pm

1 stop16h 25m

Chicago O'Hare Intl

Sun 9/28

10:30 pm-8:40 pm

1 stop16h 10m

$479

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 11/28

11:10 am-6:25 pm

1 stop13h 15m

Chicago O'Hare Intl

Wed 12/3

4:20 pm-10:45 am

1 stop12h 25m

$483

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 9/6

8:50 am-2:00 pm

1 stop11h 10m

Chicago O'Hare Intl

Wed 9/10

9:15 pm-1:55 pm

1 stop10h 40m

$486

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 9/18

8:50 am-2:00 pm

1 stop11h 10m

Chicago O'Hare Intl

Sat 10/4

9:15 pm-1:55 pm

1 stop10h 40m

$487

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 9/23

9:25 pm-6:15 pm

1 stop26h 50m

Chicago O'Hare Intl

Sun 10/5

7:25 pm-8:20 pm

1 stop18h 55m

$532

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Fri 9/12

9:25 pm-6:15 pm

1 stop26h 50m

Chicago O'Hare Intl

Fri 9/19

7:25 pm-11:55 am

1 stop10h 30m

$535

LondonEvansville

LHR - EVV

LHREVV

London Heathrow

Thu 11/13

2:45 pm-11:59 pm

1 stop15h 14m

Evansville Dress Regional

Fri 11/21

10:37 am-6:50 am

1 stop14h 13m

$1,079

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 $599, 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 March is also cheap. Prices for this month can be found on momondo for an average of $601.

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 $789. Flights from London Heathrow Airport to Illinois on a Sunday will generally be more expensive and average around $938. 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 $954.

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 $738 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 $694 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	$353
Fastest flight time	11h 10m
Direct flights	Every day
Airports in Illinois	6 airports

The best one-way flight to Illinois from London Heathrow Airport in the past 72 hours is $353. The best round-trip flight deal from London Heathrow Airport to Illinois found on momondo in the last 72 hours is $450.

The fastest flight from London Heathrow Airport to Illinois takes 11h 10m

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

There are 6 airports near Illinois: Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Paducah Barkley Regional (PAH), Greater Peoria (PIA), Lambert-St Louis (STL), Moline Quad-City (MLI)

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 July 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 47.78% of all bookings. The subsequent popular models are Boeing 787-10 Dreamliner at 15.01%, Boeing 777 at 14.01%, and Boeing 777-300ER at 5.14%.

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 $451	Free Cancellation	Rating 7.0 520 reviews	Search Icelandair flights
Scandinavian Airlines	PriceFrom $462	Free Cancellation	Rating 7.3 1,457 reviews	Search Scandinavian Airlines flights
United Airlines	PriceFrom $485	Free Cancellation	Rating 7.4 8,900 reviews	Search United Airlines flights
British Airways	PriceFrom $552	Free Cancellation	Rating 6.6 7,222 reviews	Search British Airways flights
TAP AIR PORTUGAL	PriceFrom $558	Free Cancellation	Rating 7.1 1,933 reviews	Search TAP AIR PORTUGAL flights
Aer Lingus	PriceFrom $568	Free Cancellation	Rating 7.1 1,192 reviews	Search Aer Lingus flights
Iberia	PriceFrom $582	Free Cancellation	Rating 7.0 2,859 reviews	Search Iberia flights
American Airlines	PriceFrom $583	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Austrian Airlines	PriceFrom $586	Free Cancellation	Rating 7.6 823 reviews	Search Austrian Airlines flights
Finnair	PriceFrom $607	Free Cancellation	Rating 7.6 1,316 reviews	Search Finnair 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 $39

Flights to Los Angelesfrom $37

Flights to Miamifrom $58

Flights to Chicagofrom $59

Flights to Orlandofrom $54

Flights to Las Vegasfrom $35

Flights to San Franciscofrom $49

Flights to Washington, D.C.from $49

Flights to Bostonfrom $77

Flights to Atlantafrom $29

Flights to Dallasfrom $55

Flights to Seattlefrom $93

Cheap flights from London Heathrow Airport to Illinois from $353

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

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Price Alerts

Find the cheapest flights from London Heathrow Airport to Illinois

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

TAP AIR PORTUGAL flights from London Heathrow Airport to Illinois

Our best TAP AIR PORTUGAL deals on London Heathrow Airport to Illinois flight tickets

Icelandair flights from London Heathrow Airport to Illinois

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

momondo Fare Finder

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

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?

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 $954.

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?

TAP AIR PORTUGAL is the most popular carrier 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 July 2025, there are 52 flights per day flying from London Heathrow Airport to Illinois. The most common time of day flights depart is 2:00PM, with 54% 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 366 per week as of July 2025. The most frequent departure day is Mon, with 14% 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