Question 1

What is the cheapest month to fly to London?

Accepted Answer

The cheapest month to fly to London from Chicago is in September. Flight prices, which tend to average around $654, are often lower during this time because this is during the off-season. The month of October is another great option to travel to London, with average flight prices from Chicago averaging around $661.

Question 2

What is the cheapest time of day to depart on your flight to London?

Accepted Answer

Flying to London from Chicago at noon is the least expensive time of day to depart. momondo users have found prices as low as $760 when looking at flights departing at noon. Flights to London are more costly in the afternoon, with an average ticket price of $830. Departure times in the afternoon fall within the peak daily travel times, which is why tickets can be more expensive.

Question 3

What is the cheapest Chicago to London flight route?

Accepted Answer

Fly from Chicago O'Hare Intl to London Heathrow for the best Chicago - London flight prices

Question 4

How many flights depart from Chicago to London on average per week?

Accepted Answer

305 flights are operational weekly from Chicago to London as of December 2025. The most popular departure day for this route is Wed, with 15% of flights per week taking off on this day.

Question 5

Can stopping save me money on Chicago to London flights?

Accepted Answer

You could potentially save up to 10% on your flight if you consider stops on a Chicago to London flight.

Question 6

What day of the week experiences the fewest flight delays on this route?

Accepted Answer

Tuesday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Question 7

Which airport is the most popular layover for flights between Chicago and London?

Accepted Answer

Reykjavik (KEF) was the most common stop: 43% of momondo users choosing 1-stop flights on this route connected there.

Question 8

Which layover airport has the shortest travel time from Chicago to London?

Accepted Answer

Flights connecting via Dublin (DUB) have the shortest average one-way travel time: 9h 57m.

Question 9

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

Accepted Answer

The cheapest day to depart from Chicago to London is on a Tuesday. Travelers who choose to depart for London on a Tuesday will often find tickets for as low as $770. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $918. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

Question 10

What is the cheapest airline that flies from Chicago to London?

Accepted Answer

British Airways, Scandinavian Airlines, and TAP AIR PORTUGAL are the most popular carriers operating from Chicago to London

Question 11

How often are flights from Chicago to London delayed?

Accepted Answer

Historically, on average around 25% of flights between Chicago and London have experienced a delay on any given week. The average delay length over the past 12 months has been 168 minutes.

Question 12

What airlines fly to London?

Accepted Answer

British Airways, Iberia and United Airlines are the top three most popular airlines that fly to London from Chicago according to our data. British Airways is the first choice among our users, with 51% of people opting to fly with this airline when traveling to London. Keep in mind that there are 18 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

Question 13

What is the most punctual flight time for Chicago to London flights?

Accepted Answer

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights in the morning have, in the past, seen delays more frequently in comparison.

Question 14

How have Chicago to London flight prices changed over time?

Accepted Answer

As of December 2025, prices for Chicago to London flights are approximately 13% more expensive when compared to flights at the same time last year.

Question 15

Which layover airport offers the lowest fares from Chicago to London?

Accepted Answer

Flights via Zurich (ZRH) offer the lowest average round-trip price of $508.

Question 16

What is the typical price of a round-trip flight between Chicago and London?

Accepted Answer

Prices are currently low for flights on this route.Typical prices usually range from $634 to $984.
The lowest price recently found on this route was $544.

Question 17

What cabin class options are available on Chicago to London flights?

Accepted Answer

There are 4 cabin classes available to choose from on Chicago to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Question 18

Which layover airport has the shortest connection time from Chicago to London?

Accepted Answer

Zurich (ZRH) has the shortest average layover time for this route: 1h 03m.

Question 19

How many flights depart from Chicago to London on average per day?

Accepted Answer

As of December 2025, there are 43 flights per day flying from Chicago to London. The most common time of day flights depart is 5:00PM, with 56% of flights taking off in the evening.

Question 20

Which airline has the best punctuality record on Chicago to London flights?

Accepted Answer

According to our data, United Airlines have had the least number of delays on this route over the last 12 months; with about 23% of their flights experiencing any sort of delay.

Question 21

How far in advance should I book a flight to London?

Accepted Answer

You are more likely to see cheaper flights to London from Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $795 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Chicago for as low as $702 on momondo.

Question 22

What are the benefits of the different airports in Chicago and London?

Accepted Answer

Since there are quite a few flights from Chicago to London from both major Chicago airports to the London area, your choice for which airport to utilize comes down to which one will be more convenient for you depending on your departure point within the Chicago area. Chicago O' Hare International Airport is located to the northwest of the center of Chicago and is a good option for those coming from the north side of the city and are traveling on cheap flights from Chicago to London. Chicago Midway Airport is located southwest of the city and makes a good choice for those that are coming from the south side of the city. If you are coming from downtown Chicago, both airports are equally convenient especially due to the ample public transportation available from downtown Chicago. When traveling internationally from Chicago to London, you will find that there is quite a bit more choice in terms of flights to London Heathrow Airport as opposed to London City Airport. That said, if you are going to be staying somewhere on the east side of London or anywhere east of the city of London, the London City Airport is going to be far more convenient because London Heathrow Airport is west of London and the trip from this airport to the east side of London can be quite lengthy.

Question 23

What is the best way to get in and out of airports in Chicago and London?

Accepted Answer

The two major airports in the Chicago area that operate flights from Chicago to London are Chicago O' Hare International Airport (ORD) and Chicago Midway (MDW). If you are traveling from downtown Chicago to Chicago O' Hare International Airport, a quick and convenient choice is to travel on the Chicago Transit Authority Blue Line light rail train that offers service from downtown Chicago right to the airport. The Chicago Transit Authority offers a similar service from downtown Chicago to Chicago Midway Airport on their Orange Line light-rail train. If your flight from Chicago to London will be arriving at London Heathrow Airport (LHR), a quick and convenient choice is to take the Heathrow Express light-rail train. If your flight will be arriving at the London City Airport (LCY), a good choice for transportation to the center of London is on the Dockland Light Railway DLR Line.

Which cities can you get to from London Heathrow International Airport?

While many travelers will utilize London Heathrow Airport to travel to the center of London, there are also quite a few cities and towns west of London that make traveling to London Heathrow Airport a good choice for travelers. Some of the towns and cities include Farnborough, Basingstoke, Newbury, Reading, and Guildford.

Question 24

Which airlines fly direct from Chicago to London?

Accepted Answer

For travelers making trips on flights from Chicago to London, some of the airlines offering nonstop flights include Finnair, Brussels Airlines, Lufthansa, United Airlines, Alaska Airlines, and British Airways. Beyond these nonstop flight choices, some of the one-stop Chicago to London flight options include a flight on TAP Air Portugal with a stop at Lisbon Humberto Delgado (LIS), a one-stop flight on Swiss Airlines with a layover at Zurich (ZRH), and a one-stop flight on Turkish Airlines with a layover at Istanbul (IST). KLM also offers a one-stop, one-way flight from Chicago to London that has a layover at John F. Kennedy International Airport (JFK) and British Airways offers a one-stop flight that has a layover at Charlotte Douglas (CLT). Finally, you can find a one-stop flight on Iberia with a layover at Madrid Barajas (MAD) and American Airlines offers a one-stop flight with a layover at Charlotte Douglas.

Question 25

When did momondo last update prices for flights from Chicago to London?

Accepted Answer

Prices for flights from Chicago to London refresh daily.

Question 26

How many operators does momondo search for flights from Chicago to London?

Accepted Answer

The number of operators available for flights from Chicago to London is 18 as of December 2025.

Question 27

How old do you have to be to fly from Chicago to London?

Accepted Answer

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 Chicago to London.

Question 28

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

Accepted Answer

The travel and health documents you'll need for your trip to London may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best Price Found	$399
Fastest flight time	7h 40m
Direct flights	Every day
Airports in London	6 airports

Airline	Rating	Free Cancellation	Price
JetBlue	PriceFrom $51	Free Cancellation	Rating 7.2 2,900 reviews	Search JetBlue flights
SWISS	PriceFrom $257	Free Cancellation	Rating 7.5 1,820 reviews	Search SWISS flights
Scandinavian Airlines	PriceFrom $331	Free Cancellation	Rating 7.4 1,625 reviews	Search Scandinavian Airlines flights
Delta	PriceFrom $345	Free Cancellation	Rating 7.9 8,015 reviews	Search Delta flights
TAP AIR PORTUGAL	PriceFrom $428	Free Cancellation	Rating 7.2 2,098 reviews	Search TAP AIR PORTUGAL flights
Lufthansa	PriceFrom $460	Free Cancellation	Rating 6.8 7,656 reviews	Search Lufthansa flights
Icelandair	PriceFrom $477	Free Cancellation	Rating 7.0 592 reviews	Search Icelandair flights
Aer Lingus	PriceFrom $494	Free Cancellation	Rating 7.2 1,412 reviews	Search Aer Lingus flights
British Airways	PriceFrom $502	Free Cancellation	Rating 6.7 7,617 reviews	Search British Airways flights
Finnair	PriceFrom $517	Free Cancellation	Rating 7.6 1,339 reviews	Search Finnair flights

Cheap flights from Chicago to London from $375

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago to London departing on 5/12. 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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