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Use the filters below to find and compare flights from London Heathrow Airport to Chicago that are best for you.
Fly from
Fly to
Route
Depart
Return
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Mon 14/12
20:35-17:20
1 stop26h 45m
Chicago O'Hare Intl
Wed 6/1
18:30-10:50
1 stop10h 20m
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Tue 23/3
20:35-21:25
1 stop29h 50m
Chicago O'Hare Intl
Wed 7/4
22:25-11:55
1 stop31h 30m
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Sun 8/11
20:35-17:20
1 stop26h 45m
Chicago O'Hare Intl
Thu 12/11
18:30-19:30
1 stop19h 00m
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Sun 31/1
12:15-17:20
1 stop11h 05m
Chicago O'Hare Intl
Thu 11/2
18:30-10:50
1 stop10h 20m
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Wed 3/2
20:35-17:20
1 stop26h 45m
Chicago O'Hare Intl
Thu 11/2
18:30-10:50
1 stop10h 20m
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Sun 22/11
21:05-16:45
2 stops25h 40m
Chicago O'Hare Intl
Sun 29/11
19:10-18:30
1 stop17h 20m
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Mon 9/11
19:50-16:45
2 stops26h 55m
Chicago O'Hare Intl
Mon 23/11
19:10-21:35
2 stops20h 25m
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Mon 9/11
19:50-16:45
2 stops26h 55m
Chicago O'Hare Intl
Mon 23/11
19:10-21:35
2 stops20h 25m
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Mon 9/11
19:50-16:45
2 stops26h 55m
Chicago O'Hare Intl
Mon 23/11
19:10-21:35
2 stops20h 25m
LondonChicago
LHR London Heathrow - ORD Chicago O'Hare Intl
LHRORD
London Heathrow
Mon 9/11
19:50-16:45
2 stops26h 55m
Chicago O'Hare Intl
Mon 23/11
19:10-21:35
2 stops20h 25m
See travel insights to Chicago from
How to get the cheapest flight ticket from London Heathrow Airport to Chicago
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 typical price of a round-trip flight between London Heathrow Airport and Chicago?
Prices are currently typical for flights on this route.
Typical prices usually range from $1,005 to $1,404.The lowest price recently found on this route was $1,032.
What is the cheapest month to fly to Chicago?
If you don’t want to visit Chicago in February, then you should wait until January to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of $1,042.
What is the cheapest London Heathrow to Chicago flight route?
Fly from London Heathrow to Chicago O'Hare Intl for the best London Heathrow - Chicago flight prices
How far in advance should I book a flight from London Heathrow Airport to Chicago?
You are more likely to see cheaper flights to Chicago from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Chicago for around $1,287 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Chicago from London Heathrow Airport for as low as $1,158 on momondo.
What cabin class options are available on London Heathrow Airport to Chicago flights?
There are 2 cabin classes available to choose from on London Heathrow Airport to Chicago 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 Chicago flights?
No. A direct flight is the cheapest option for a flight between London Heathrow Airport to Chicago.
How have London Heathrow Airport to Chicago flight prices changed over time?
As of October 2026, prices for London Heathrow Airport to Chicago flights are approximately 14% cheaper when compared to flights at the same time last year.
How often are flights from London to Chicago delayed?
Historically, on average around 8% of flights between London and Chicago have experienced a delay on any given week. The average delay length over the past 12 months has been 179 minutes.
What is the most punctual flight time for London to Chicago flights?
Generally, flights departing in the morning tend to experience fewer delays. Flights departing in the early afternoon have, in the past, seen delays more frequently in comparison.
What day of the week experiences the fewest flight delays on this route?
Monday is statistically the day of the week that experiences the fewest delays on this flight route. Friday has historically seen more delays on average compared to the rest of the week.
Which airline has the best punctuality record on London to Chicago flights?
According to our data, United Airlines have had the fewest delays on this route over the last 12 months, with about 5% of their flights experiencing any sort of delay.
How many flights depart from London Heathrow Airport to Chicago on average per day?
As of October 2026, there are 48 flights per day flying from London Heathrow Airport to Chicago. The most common time of day flights depart is 11:00, with 51% of flights taking off at midday.
How many flights depart from London Heathrow Airport to Chicago on average per week?
The number of flights available between London Heathrow Airport and Chicago is 340 per week as of October 2026. The most frequent departure day is Mon, with 15% of weekly flights leaving on this day.
When to book flights from London Heathrow Airport to Chicago
Cheap London Heathrow Airport to Chicago (LHR to CHI) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Chicago
Frequently asked questions about flying from London Heathrow Airport to Chicago
How far is London Heathrow to Chicago by plane?
A flight from London Heathrow to Chicago will travel around 6330.3 km. Flights usually cover this in 9h 05m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from London Heathrow Airport to Chicago?
Prices for flights from London Heathrow Airport to Chicago are updated daily.
How old do you have to be to fly from London Heathrow Airport to Chicago?
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 stopovers 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 Chicago.
What documentation or ID do you need to fly to Chicago?
The required travel and health documents for your Chicago 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 licence and a passport valid for six months after your intended arrival at Chicago. 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 Chicago?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from London Heathrow Airport to Chicago is Boeing 767-300 (35.66% of total bookings). The next most popular plane models are Boeing 777 (17.84%), Boeing 787-10 Dreamliner (10.98%), and Boeing 787-9 Dreamliner (8.86%).
Why use momondo?
Why should I use momondo to find a flight deal from London to Chicago?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from London to Chicago. momondo saves you time and could save you money on your trip.
Can I find flights from London to Chicago with flexible booking policies on momondo?
All flight searches from London to Chicago on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from London to Chicago?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from London to Chicago.
I’m not ready to book a flight from London to Chicago right now. Can momondo alert me if prices change?
Price alerts on flights to Chicago from London are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.