What are the cheapest airlines flying from Chicago to London round-trip?

Iberia, at $658, was found to be the cheapest airline from Chicago to London.Alternate airlines to your destination round-trip include British Airways and Scandinavian Airlines. Iberia is 14% cheaper than the average price of flights available within the next 90 days to this destination.

What are the cheapest airlines to fly from Chicago to London one-way?

$353 is the cheapest one-way deal found within the past few days, from JetBlue. You may also be able to find cheap deals on Porter Airlines and Icelandair, with prices starting from $355 and $356, respectively.

How far ahead should I book a flight from Chicago to London?

The best time to book flights from Chicago to London is 84 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Chicago to London?

Currently, November is the cheapest month in which you can book a flight from Chicago to London (average of $661). Flying from Chicago to London in June is currently the most expensive (average of $1,098). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest day to fly from Chicago to London?

Travelers seeking maximum savings on their Chicago to London flight should consider departing on Wednesday at noon when fares are most often at their lowest. Friday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Chicago to London

The most flights from CHI to LON are scheduled on a Monday (51 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (31 on average).

In terms of precipitation, rainfall in London ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London when rainfall is around 1.6 in.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

What are the most popular routes from Chicago to London?

The most popular route from Chicago to London is Chicago O'Hare Intl - London Heathrow. You may also consider Chicago O'Hare Intl - London Gatwick or Chicago O'Hare Intl - London City.

What are the cheapest flights from Chicago to London?

Looking at all options, your cheapest flight can be booked for $370. While the most popular route (Chicago O'Hare Intl - London Heathrow) can be booked for $446 on average our data indicates $2,683 when flying from Chicago to London.

What are the most reliable airlines from Chicago to London?

Before booking your flight to London from Chicago, check out the most reliable airlines to get you to your destination on time: Royal Jordanian (80%), Air Canada (76%), Austrian Airlines( 76%).

What are the most popular airlines that fly from Chicago to London?

When booking a flight from Chicago to London, you may want to consider flying on American Airlines, Air Canada or Alaska Airlines as they are the most popular for this route.

Where are the most common layover locations when flying from Chicago to London?

Of the flights from Chicago to London that have layovers, most of them stop in Reykjavik. Dublin sees the next most layovers on Chicago to London flights.

Where are the least popular layover locations for Chicago to London flights?

Chicago to London flights have a layover in Lisbon least often. Lisbon is followed by Copenhagen in terms of the least popular layover location on flights from Chicago to London.

What are some popular things to do or see while on a layover in Reykjavik?

Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool are the most popular attractions in Reykjavik if you're in need of something to do during your layover. Hallgrímskirkja, Harpa, and Laugardalslaug Geothermal Pool are located about 23.2 mi, 23.3 mi, and 24.6 mi, respectively from Reykjavik Keflavik Intl. Travelers can book a car rental at Reykjavik Keflavik Intl for about $74 per day to make their sightseeing more efficient.

What are some popular points of interest to see during a layover in Dublin?

Most Dublin visitors opt to spend their time at Molly Malone Statue, Parnell Square, and St. Patrick's Cathedral. Molly Malone Statue, Parnell Square and St. Patrick's Cathedral are located about 5.8 mi, 5.0 mi, and 6.1 mi, respectively from Dublin if you are interested in checking them out. Those on a layover in Dublin in need of a rental car can book one at Dublin for about $22.

What is the cheapest day to fly round-trip from Chicago to London?

It’s generally more expensive to depart on a Tuesday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

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

Find a great deal and save up to 5% by booking at least 49 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Chicago to London within the next two weeks, with the cheapest ticket starting at $714.

What is the cheapest month to fly from Chicago to London?

February can be a great time to fly to London from Chicago with a flight ticket averaging about $765. Cheapflights users have found deals in the month of February for as cheap as $472. The most expensive prices can be found in the month of June.

What is the cheapest time of day to fly from CHI to LON?

A simple way to save on the total cost of your ticket is to fly from Chicago to London in the morning. If you’re flexible enough to do this you can expect to save up to 16% on your trip compared to booking a flight in the afternoon.

Can I find deals for flights from Chicago to London that include hotel bookings?

Yes. In addition to deals on Chicago to London flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Chicago to London?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Chicago to London.

Can I find deals for business class flights from Chicago to London?

Yes. Cheapflights offers flight deals from Chicago to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$352+ Flights from Chicago to London

Round-trip from	$658 (Iberia)
One-way from	$353 (JetBlue)
Popular in	June
Cheapest in	February
Average price	$1,034
Good round-trip deal	$670 or less
Good one-way deal	$487 or less

Iberia's premium economy offers 37-inch legroom, footrests, and noise-canceling headphones for long-haul comfort.

Iberia's business class features lay-flat beds with massage function and adjustable pillows for ultimate relaxation.

Airline	Cheapest	Average	Flexibility	On-time
SWISS	Cheapest$257	Average$723	FlexibilityNo cancel fee	On-time79%
Delta	Cheapest$345	Average$935	FlexibilityNo cancel fee	On-timeN/A
Scandinavian Airlines	Cheapest$381	Average$600	FlexibilityNo cancel fee	On-time77%
Lufthansa	Cheapest$430	Average$917	FlexibilityNo cancel fee	On-time76%
Icelandair	Cheapest$465	Average$650	FlexibilityNo cancel fee	On-time76%
TAP AIR PORTUGAL	Cheapest$507	Average$792	FlexibilityNo cancel fee	On-timeN/A
JetBlue	Cheapest$516	Average$869	FlexibilityNo cancel fee	On-time62%
Aer Lingus	Cheapest$543	Average$800	FlexibilityNo cancel fee	On-timeN/A
Finnair	Cheapest$569	Average$753	FlexibilityNo cancel fee	On-time76%
Iberia	Cheapest$581	Average$870	FlexibilityNo cancel fee	On-time77%

$352+ Cheap flights from Chicago (CHI) to London (LON)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/8. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Chicago to London with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheapflights Tip: The best prices from Chicago to London are usually found in February or January, booked 84 days in advance, depart on a Wednesday or Tuesday and return on a Friday

Cheap flight deals from Chicago to London

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Chicago to London

Cheapest flights from Chicago to LondonExplore the most affordable flight options available from Chicago to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2025.

Explore the most affordable flight options available from Chicago to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2025.

Cheapflights Fare Finder

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

The best insider tips for Chicago to London flights

Cheapflights partnered with top experts to bring you the best recommendations for your Chicago to London trip

Airlines

British Airways

Iberia

Airports

ORD

LHR

Our travel experts

Best time to book a flight from Chicago to London

Have a flexible travel schedule? Discover the best time to fly to London from Chicago with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Chicago to London

How far ahead should I book a flight from Chicago to London?

Use this chart to determine the optimal time to book a round-trip flight from Chicago to London. Price data was last updated on June 27, 2025.

What is the cheapest month to book a flight from Chicago to London?

What is the cheapest time of day to fly from CHI to LON?

Find hourly flight availability from Chicago to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 1, 2025.

What is the cheapest day to fly from Chicago to London?

Use this chart to determine the cheapest time to fly round-trip from Chicago to London. Price data was last updated on September 22, 2024.

Weekly flight availability from Chicago to London

Explore weekly flight availability from Chicago to London. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated July 1, 2025.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated July 1, 2025.

See what other customers who have flown with Delta, Porter Airlines, and KLM from Chicago to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Chicago to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines flying from Chicago to London round-trip?

What are the cheapest airlines to fly from Chicago to London one-way?

What are the most popular routes from Chicago to London?

What are the most reliable airlines from Chicago to London?

What are the cheapest flights from Chicago to London?

Where are the most common layover locations when flying from Chicago to London?

What are some popular things to do or see while on a layover in Reykjavik?

What are some popular points of interest to see during a layover in Dublin?

Where are the least popular layover locations for Chicago to London flights?

Can I find deals for flights from Chicago to London that include hotel bookings?

How can I find direct flights from Chicago to London?

Can I find deals for business class flights from Chicago to London?

What is the cheapest month to book a flight from Chicago to London?

Traveling to a place near Chicago?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Chicago to London

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from Chicago to London

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Chicago to London
Explore the most affordable flight options available from Chicago to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2025.