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$536+ Cheap flights from Heathrow (LHR) to Chicago (CHI)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CHI
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheapflights Tip: The best prices from London Heathrow to Chicago are usually found in February or March, booked 45 days in advance, depart on a Wednesday or Tuesday and return on a Tuesday

Cheap flight deals from Heathrow to Chicago

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Chicago (CHI). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 15, 2025.

Round-trip from

$536
(Kiwi.com)

Popular in

July

Cheapest in

February

Average price

$609

Good round-trip deal

$750 or less

Good one-way deal

$630 or less
From London Heathrow to Chicago (CHI)
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($92 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($15 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from London Heathrow to Chicago (CHI).
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Price to beat on a one-way flight from London Heathrow to Chicago (CHI).
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Find flight deals from Heathrow to Chicago

Cheapest flights from Heathrow to Chicago
Explore the most affordable flight options available from Heathrow to Chicago. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/37:40 amLHR - ORD
1 stop14h 05mAmerican Airlines
Mon 10/61:43 pmORD - LHR
1 stop10h 47mAmerican Airlines
Deal found 9/14$536
This Kiwi.com deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/196:00 amLHR - ORD
1 stop15h 55mMultiple Airlines
Sun 9/216:00 pmORD - LHR
Nonstop8h 20mMultiple Airlines
Deal found 9/12$537
This Scandinavian Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/87:50 pmLHR - ORD
2 stops50h 55mScandinavian Airlines
Sat 1/107:20 pmORD - LHR
1 stop14h 40mScandinavian Airlines
Deal found 9/14$538
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/97:45 amLHR - ORD
2 stops14h 50mUnited Airlines
Wed 10/154:50 pmORD - LHR
1 stop12h 35mUnited Airlines
Deal found 9/15$539
This Netflights deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/612:35 pmLHR - ORD
Nonstop8h 50mBritish Airways
Wed 11/129:45 pmORD - LHR
Nonstop7h 50mBritish Airways
Deal found 9/13$540
This Icelandair deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/1412:15 pmLHR - ORD
1 stop11h 05mIcelandair
Thu 1/156:30 pmORD - LHR
1 stop19h 00mIcelandair
Deal found 9/15$541
This Netflights deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Netflights is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/72:10 pmLHR - ORD
Nonstop8h 50mBritish Airways
Fri 11/289:45 pmORD - LHR
Nonstop7h 50mBritish Airways
Deal found 9/15$542
This Icelandair deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/138:35 pmLHR - ORD
1 stop26h 45mIcelandair
Tue 1/66:30 pmORD - LHR
1 stop19h 00mIcelandair
Deal found 9/14$543
This Gotogate deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/298:35 pmLHR - ORD
1 stop26h 45mIcelandair
Sun 1/116:30 pmORD - LHR
1 stop10h 20mIcelandair
Deal found 9/13$544
This United Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/97:45 amLHR - ORD
2 stops14h 50mUnited Airlines
Mon 10/136:00 pmORD - LHR
1 stop17h 05mUnited Airlines
Deal found 9/15$545
This TravelUp deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/251:05 pmLHR - MDW
1 stop14h 31mVirgin Atlantic
Sun 9/2812:43 pmMDW - LHR
1 stop12h 32mVirgin Atlantic
Deal found 9/13$545
This Scandinavian Airlines deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/3010:20 amLHR - ORD
1 stop13h 25mScandinavian Airlines
Sun 11/27:20 pmORD - LHR
2 stops17h 30mScandinavian Airlines
Deal found 9/15$546

Cheapflights Fare Finder

 
Customize your flight search to find flights from Heathrow to Chicago that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 15, 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Chicago that are best for you.

Fly from

Heathrow

Fly to

Chicago

Route

Depart

Return

Price

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 10/4

9:30 am-11:15 pm

2 stops19h 45m

Chicago O'Hare Intl

Tue 10/7

11:45 am-5:55 am

1 stop12h 10m

$538

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 10/1

7:45 am-4:35 pm

2 stops14h 50m

Chicago O'Hare Intl

Tue 10/21

1:17 pm-7:15 am

1 stop11h 58m

$539

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Wed 10/1

7:45 am-4:35 pm

2 stops14h 50m

Chicago O'Hare Intl

Sun 10/12

2:08 pm-9:35 am

1 stop13h 27m

$539

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 12/15

12:15 pm-5:20 pm

1 stop11h 05m

Chicago O'Hare Intl

Thu 1/15

6:30 pm-7:30 pm

1 stop19h 00m

$541

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 12/15

12:15 pm-5:20 pm

1 stop11h 05m

Chicago O'Hare Intl

Wed 1/14

6:30 pm-10:50 am

1 stop10h 20m

$541

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 12/13

8:35 pm-5:20 pm

1 stop26h 45m

Chicago O'Hare Intl

Thu 1/8

6:30 pm-7:30 pm

1 stop19h 00m

$543

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Thu 12/11

6:40 am-4:45 pm

1 stop16h 05m

Chicago O'Hare Intl

Fri 1/9

7:20 pm-2:35 pm

2 stops37h 15m

$558

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Mon 10/6

2:10 pm-5:20 pm

Nonstop9h 10m

Chicago O'Hare Intl

Tue 10/14

8:40 am-9:35 am

1 stop18h 55m

$561

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Sat 12/6

10:25 am-1:45 pm

Nonstop9h 20m

Chicago O'Hare Intl

Sun 12/7

3:45 pm-5:55 am

Nonstop8h 10m

$562

LondonChicago

LHR - ORD

LHRORD

London Heathrow

Tue 10/28

7:40 am-12:00 pm

Nonstop9h 20m

Chicago O'Hare Intl

Tue 11/4

3:45 pm-5:55 am

Nonstop8h 10m

$562

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/12

Showing 1-10 of 44 results
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The best insider tips for London Heathrow Airport to Chicago flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your London Heathrow Airport to Chicago trip
Airlines
Iberia

Iberia's premium economy offers 37 inches of legroom and noise-canceling headphones for long-haul comfort.


Iberia provides two hot meal options on long-haul flights, with special meals available upon request.

Read more about Iberiaby Emily Zemler
British Airways

BA's Club Suite offers private pods with doors on A350s, ensuring a more private experience.


BA's World Traveller Plus provides extra seat width and legroom, ideal for long-haul comfort.

Read more about British Airwaysby Gabriel Leigh
United Airlines

United's Polaris Business Class includes lie-flat seats, Saks Fifth Avenue bedding, and priority check-in.


United's Premium Plus offers extra legroom, upgraded meals, and two checked bags on international flights.

Read more about United Airlinesby Harriet Baskas
Airports
LHR

Heathrow's strict security means long waits. Ensure all liquids are in one small bag to avoid delays during manual screenings.

Read more about LHRby Ramsey Qubein
ORD

At ORD, immigration lines can be long. Be prepared for lengthy walks to reach customs after international flights.

Read more about ORDby Ramsey Qubein
Our travel experts
Emily Zemler

Emily Zemler

Expert on Iberia

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Gabriel Leigh

Gabriel Leigh

Expert on British Airways

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on ORD and LHR

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more

Best time to book a flight from Heathrow to Chicago

Have a flexible travel schedule? Discover the best time to fly to Chicago from Heathrow with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

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

Use this chart to determine the optimal time to book a round-trip flight from Heathrow to Chicago. Price data was last updated on September 12, 2025.

The price you pay for your flight from London Heathrow Airport to Chicago may vary depending on when you book. For the best chance of a lower fare, look to book 45 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, August is the cheapest month in which you can book a flight from London Heathrow Airport to Chicago (average of $245). Flying from London Heathrow Airport to Chicago in March is currently the most expensive (average of $321). 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 time of day to fly from LHR to CHI?

Find hourly flight availability from Heathrow to Chicago. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

A simple way to save on the total cost of your ticket is to fly from London Heathrow Airport to Chicago in the evening. If you’re flexible enough to do this you can expect to save up to 34% on your trip compared to booking a flight in the afternoon.

Weekly flight availability from London Heathrow Airport to Chicago

Explore weekly flight availability from Heathrow to Chicago. 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 September 15, 2025.

The most flights from LHR to CHI are scheduled on a Sunday (54 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (42 on average).

What’s the top layover airport for flights from London Heathrow Airport to Chicago?

Share of 1-stop round-trip flights from London Heathrow Airport to Chicago chosen by Cheapflights users in the past 12 months, using the same layover each way.

Reykjavik (KEF) – chosen by Cheapflights users on 67% of 1-stop itineraries from London Heathrow Airport to Chicago on Cheapflights.

What’s the cheapest layover airport for flights from London Heathrow Airport to Chicago?

Average round-trip fare for 1-stop flights from London Heathrow Airport to Chicago, chosen by Cheapflights users in the past 12 months, with the same layover each way.

Reykjavik (KEF) is the most affordable 1-stop option, with an average round-trip price of $544.

What’s the fastest layover option from London Heathrow Airport to Chicago?

Shortest average travel time for 1-stop one-way flights from London Heathrow Airport to Chicago, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by layover airport.

Flights via Reykjavik (KEF) have the shortest average one-way travel time for 1-stop routes: 11h 10m.

Which airport typically offers the quickest layover for flights from London Heathrow Airport to Chicago?

Average layover duration for 1-stop one-way flights from London Heathrow Airport to Chicago, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average layover time of 1h 05m.

Reviews of airlines servicing Chicago

Get insights into the airlines that provide service to Chicago. 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 Chicago. Reviews last updated September 15, 2025.
Get a feel of what it's like to fly with United Airlines, American Airlines, and Aer Lingus from London Heathrow Airport to Chicago by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,929 reviews

Food

6.6

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
United Airlines
7.4
Good
8,929 reviews
United Airlines
7.4
Good
8,929 reviews

Food

6.6

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
American Airlines
7.2
Good
10,000 reviews
United Airlines
7.4
Good
8,929 reviews

Food

6.6

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
Aer Lingus
7.2
Good
1,270 reviews
United Airlines
7.4
Good
8,929 reviews

Food

6.6

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
Lufthansa
6.8
Okay
7,407 reviews
United Airlines
7.4
Good
8,929 reviews

Food

6.6

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!
British Airways
6.7
Okay
7,361 reviews
United Airlines
7.4
Good
8,929 reviews

Food

6.6

Entertainment

7.1

Crew

8.1

Boarding

7.7

Comfort

7.3

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

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

  • How long is the flight from London Heathrow Airport to Chicago?

    United Airlines, Icelandair, and Delta can get you from London Heathrow Airport to Chicago in just under 11h 05m. Your travel time can differ by up to 8h 40m. The distance from London Heathrow Airport to Chicago is about 3939 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    Currently priced at $451, Icelandair will fly you from London Heathrow Airport to Chicago and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Aer Lingus and Scandinavian Airlines - these airlines can fly you to your destination from $453 and $462, respectively. Icelandair is currently priced 36% below the average price you’ll pay for this route.

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

    For one-way options, check prices for Delta. According to our data, you can fly for as low as $544. Users have also found prices from $544 and $553 on Virgin Atlantic and Austrian Airlines, respectively.

  • What are the most reliable airlines from London Heathrow Airport to Chicago?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from London Heathrow Airport to Chicago on time: Air Canada (75%), Austrian Airlines (75%), United Airlines (75%).

  • What are the cheapest flights from London Heathrow Airport to Chicago?

    On average you can expect to pay $1,476 for a flight from London Heathrow Airport to Chicago. The cheapest flight overall is $593 while the most popular route, (London Heathrow - Chicago O'Hare Intl) is currently priced at $448.

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

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

  • How can I find direct flights from Heathrow to Chicago?

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

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

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

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

    Currently, August is the cheapest month in which you can book a flight from London Heathrow Airport to Chicago (average of $245). Flying from London Heathrow Airport to Chicago in March is currently the most expensive (average of $321). 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.

See more FAQs

Traveling to a place near Chicago?

Book flights to Chicago if you plan to visit one of these locations
Merrillville
Lansing
Hammond
Benton Harbor
Porter
Chesterton

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Top 10 airlines flying from Heathrow to Chicago

Discover the top 10 airlines that operate flights from Heathrow to Chicago. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$451Average$565FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$453Average$683FlexibilityNo cancel feeOn-timeN/A
Scandinavian AirlinesCheapest$462Average$535FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$485Average$745FlexibilityNo cancel feeOn-time69%
British AirwaysCheapest$553Average$774FlexibilityNo cancel feeOn-time70%
TAP AIR PORTUGALCheapest$558Average$789FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$579Average$805FlexibilityNo cancel feeOn-time71%
Austrian AirlinesCheapest$584Average$967FlexibilityNo cancel feeOn-time78%
IberiaCheapest$599Average$793FlexibilityNo cancel feeOn-time77%
FinnairCheapest$607Average$809FlexibilityNo cancel feeOn-time76%

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