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$411+ Cheap flights from Portland (PDX) 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 8/4. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — LON
May 17 — May 241
Sat 5/17
Sat 5/24
1 adult, Economy
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Cheapflights Tip: The best prices from Portland to London are usually found in November or October, booked 69 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from Portland to London

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to London (LON). 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 May 12, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$692
(British Airways)

One-way from

$411
(Cheapflightsfares)

Popular in

June

Cheapest in

November

Average price

$867

Good round-trip deal

$792 or less

Good one-way deal

$548 or less
Provider with most accurate pricing for Portland-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Portland-London (LON) flights.
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From Portland to London (LON)
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One-way flight from Portland to London (LON)
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Highest demand for flights based on searches. 21% potential increase in price ($235 potential increase over avg. RT price).
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Cheapest flight prices on average. 4% potential price decrease ($38 potential savings vs. average RT price).
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Average for round-trip flights in May 2025
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Price to beat on a round-trip flight from Portland to London (LON).
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Price to beat on a one-way flight from Portland to London (LON).
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Find flight deals from Portland to London

Cheapest flights from Portland to London
Explore the most affordable flight options available from Portland to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 12, 2025.

This British Airways deal was found by Cheapflights users on 5/12. 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/157:25 pmPDX - LHR
Nonstop9h 35mBritish Airways
Thu 9/253:40 pmLHR - PDX
Nonstop9h 55mBritish Airways
Deal found 5/12$692
This oojo deal was found by Cheapflights users on 5/11. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/13:20 pmPDX - LGW
1 stop15h 20mIcelandair
Mon 10/63:40 pmLGW - PDX
1 stop34h 15mIcelandair
Deal found 5/11$692
This Lufthansa deal was found by Cheapflights users on 5/12. 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 Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1510:00 amPDX - LHR
2 stops17h 50mLufthansa
Mon 9/296:30 pmLHR - PDX
2 stops32h 16mLufthansa
Deal found 5/12$693
This Cheapflightsfares deal was found by Cheapflights users on 5/11. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/287:25 pmPDX - LHR
Nonstop9h 35mIberia
Wed 9/33:40 pmLHR - PDX
Nonstop9h 55mIberia
Deal found 5/11$695
This Ovago deal was found by Cheapflights users on 5/11. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/217:00 amPDX - LHR
1 stop15h 20mSWISS
Tue 8/266:00 amLHR - PDX
2 stops24h 30mSWISS
Deal found 5/11$696
This Air Canada deal was found by Cheapflights users on 5/11. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/1810:00 amPDX - LHR
2 stops17h 50mAir Canada
Mon 9/18:30 amLHR - PDX
2 stops18h 16mAir Canada
Deal found 5/11$697
This United Airlines deal was found by Cheapflights users on 5/11. 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.
Sat 7/2611:59 pmPDX - LHR
1 stop23h 41mUnited Airlines
Sun 8/2412:20 pmLHR - PDX
1 stop14h 12mUnited Airlines
Deal found 5/11$698
This Virgin Atlantic deal was found by Cheapflights users on 5/11. 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 Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2812:55 pmPDX - LCY
1 stop11h 15mVirgin Atlantic
Thu 10/168:10 pmLCY - PDX
1 stop22h 55mVirgin Atlantic
Deal found 5/11$708
This Scandinavian Airlines deal was found by Cheapflights users on 5/12. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/181:38 pmPDX - LHR
2 stops24h 02mScandinavian Airlines
Tue 8/269:05 pmLHR - PDX
3 stops29h 38mScandinavian Airlines
Deal found 5/12$711
This KLM deal was found by Cheapflights users on 5/11. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/193:15 pmPDX - LCY
2 stops19h 20mKLM
Tue 9/95:10 pmLCY - PDX
1 stop26h 10mKLM
Deal found 5/11$712
This SWISS deal was found by Cheapflights users on 5/11. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/68:30 amPDX - LCY
2 stops20h 00mSWISS
Wed 10/229:25 amLCY - PDX
2 stops17h 21mSWISS
Deal found 5/11$713
This Delta deal was found by Cheapflights users on 5/12. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/163:15 pmPDX - LHR
1 stop15h 00mDelta
Fri 9/266:00 pmLHR - PDX
1 stop13h 51mDelta
Deal found 5/12$715

Cheapflights Fare Finder

Customize your flight search to find flights from Portland to London 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 May 12, 2025.
Use the filters below to find and compare flights from Portland to London that are best for you.

Fly from

Portland

Fly to

London

Route

Depart

Return

Price

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 8/3

5:30 am-12:45 pm

1 stop23h 15m

London Heathrow

Tue 8/12

9:20 pm-10:04 pm

2 stops32h 44m

$695

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sat 7/26

11:59 pm-7:40 am

1 stop23h 41m

London Heathrow

Sun 8/24

12:20 pm-6:32 pm

1 stop14h 12m

$698

PortlandLondon

PDX - LHR

PDXLHR

Portland

Fri 8/8

6:15 am-6:30 am

2 stops16h 15m

London Heathrow

Mon 9/1

7:30 pm-6:29 pm

2 stops30h 59m

$700

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 8/3

10:00 am-11:50 am

2 stops17h 50m

London Heathrow

Fri 8/15

9:30 am-10:56 pm

2 stops21h 26m

$701

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 8/3

5:30 am-6:25 am

1 stop16h 55m

London Heathrow

Fri 8/15

3:40 pm-5:35 pm

Nonstop9h 55m

$702

PortlandLondon

PDX - LHR

PDXLHR

Portland

Thu 8/7

3:20 pm-8:20 pm

1 stop21h 00m

London Heathrow

Mon 8/18

9:25 pm-5:55 pm

1 stop28h 30m

$705

PortlandLondon

PDX - LGW

PDXLGW

Portland

Mon 6/2

3:20 pm-11:45 am

1 stop12h 25m

London Gatwick

Tue 6/17

3:40 pm-5:55 pm

1 stop34h 15m

$719

PortlandLondon

PDX - LGW

PDXLGW

Portland

Sun 8/3

7:00 am-10:00 am

1 stop19h 00m

London Gatwick

Fri 8/15

12:00 pm-9:35 pm

1 stop17h 35m

$731

PortlandLondon

PDX - LHR

PDXLHR

Portland

Fri 8/1

10:00 am-11:50 am

2 stops17h 50m

London Heathrow

Sun 8/24

2:10 pm-10:56 pm

1 stop16h 46m

$733

PortlandLondon

PDX - LGW

PDXLGW

Portland

Sat 5/24

5:40 pm-6:55 am

2 stops29h 15m

London Gatwick

Fri 6/6

10:55 am-12:14 pm

1 stop33h 19m

$735

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/10

Showing 1-10 of 54 results
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Compare providers for flights from Portland to London

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to London in May.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*2 stars
AranGrantPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Portland-London flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Portland-London flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from Portland-London flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Portland-London flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland-London flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

The best insider tips for Portland to London 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 Portland to London trip
Airports
PDX

Expect security wait times up to 30 minutes during peak hours. Use Express Lanes if eligible for faster processing.

Read more about PDXby Brandon Schultz
LHR

Take the Heathrow Express for the fastest route to central London, reaching Paddington Station quickly.

Read more about LHRby Ramsey Qubein
Our travel experts
Brandon Schultz

Brandon Schultz

Expert on PDX

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on 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 Portland to London

Have a flexible travel schedule? Discover the best time to fly to London from Portland 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 Portland to London

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

Use this chart to determine the optimal time to book a round-trip flight from Portland to London. Price data was last updated on May 9, 2025.

The price you pay for your flight from Portland to London may vary depending on when you book. For the best chance of a lower fare, look to book 69 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 Portland to London?

Currently, November is the cheapest month in which you can book a flight from Portland to London (average of $661). Flying from Portland to London in June is currently the most expensive (average of $1,100). 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 PDX to LON?

Find hourly flight availability from Portland 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 May 12, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 19% on flights from Portland to London by exploring options for tickets at noon.

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

Use this chart to determine the cheapest time to fly round-trip from Portland to London. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Portland to London flight should consider departing on Monday afternoons when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Portland to London

Explore weekly flight availability from Portland 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 May 12, 2025.

The most flights from PDX to LON are scheduled on a Monday (7 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (7 on average).

Rainfall in London by month

Plan your trip to London by taking into account the average rainfall totals by month.

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.

Temperature in London by month

Plan your trip to London by taking into account the average temperature totals by month.

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).

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 May 12, 2025.
Read through reviews of airlines operating flights from Portland to London, such as Delta, Alaska Airlines and KLM. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,950 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,950 reviews
Delta
8.0
Very good
7,950 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Alaska Airlines
8.0
Very good
10,000 reviews
Delta
8.0
Very good
7,950 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,340 reviews
Delta
8.0
Very good
7,950 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,276 reviews
Delta
8.0
Very good
7,950 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,593 reviews
Delta
8.0
Very good
7,950 reviews

Overall

8.0

Boarding

8.2

Entertainment

7.9

Food

7.3

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

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

  • What airport do you fly from for flights from Portland to London?

    For a flight from Portland to London, you will be flying from Portland. Portland (PDX) is just 6.0 mi from the center of the city. Portland is the only Portland airport and it handles 7 outbound flights to London per day. 12 airlines have flights to London from Portland on a regular basis.

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

    Cheapflights users have booked flights from Portland to London round-trip from $692. Other airlines that can offer you cheap pricing are Lufthansa, from $693, and SWISS, from $696. You may be able to fly from Portland to London for 17% less than the average price by searching for these airlines.

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

    The cheapest airlines for a one-way flight from Portland to London are British Airways ($411), Air Canada ($414), and United Airlines ($419).

  • What are the most popular routes from Portland to London?

    The most popular flight routes from Portland to London are Portland - London Heathrow, Portland - London Gatwick and Portland - London City.

  • What are the most reliable airlines from Portland to London?

    The top 3 most reliable airlines when flying from Portland to London are American Airlines (85%), Alaska Airlines (85%) and Aer Lingus (85%).

  • What are the cheapest flights from Portland to London?

    The cheapest flight price from Portland to London is $430. On average you can expect to pay $1,552. The most popular route, (Portland - London Heathrow), can usually be booked for $525.

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

    Portland to London flights have a layover in Seattle most often.

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

    Pike Place Market, Space Needle, and Seattle Waterfront are the most popular attractions in Seattle if you're in need of something to do during your layover. Travelers on a layover in Seattle can visit Pike Place Market, Space Needle, and Seattle Waterfront, by traveling 11.2 mi, 12.0 mi, and 10.9 mi, respectively after landing at Seattle/Tacoma Intl. Travelers can book a car rental at Seattle/Tacoma Intl for about $49 per day to make their sightseeing more efficient.

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

    Portland to London flights that have layovers will least frequently stop in Reykjavik.

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

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

  • How can I find direct flights from Portland to London?

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

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

    Yes. Cheapflights offers flight deals from Portland 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.

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

    Currently, November is the cheapest month in which you can book a flight from Portland to London (average of $661). Flying from Portland to London in June is currently the most expensive (average of $1,100). 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 Portland?

Book flights to Portland if you plan to visit one of these locations
Hayes
Hounslow
Thornton Heath
Luton
Canterbury
Harrow
Wembley
Dover
Gatwick
Orpington
Watford
Croydon
Borehamwood
Folkestone
Ilford
Aylesbury
Chelmsford
Sutton
Brentwood
Chichester

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Alternative routes for Portland to London

See prices for flight routes from nearby airports that may be better suited for you.
Portland to Heathrow flights
Portland to Gatwick flights
Portland to London City flights
Boise to Heathrow flights
Portland to Edinburgh flights
Boise to Gatwick flights
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Medford to Heathrow flights
Portland to Stansted flights
Eugene to Heathrow flights
Boise to London City flights
Boise to Edinburgh flights
Portland to Luton flights
Medford to Gatwick flights
Eugene to Gatwick flights
Redmond to Gatwick flights
Eugene to London City flights
Portland to Bristol flights
Medford to Manchester flights
Redmond to London City flights
Portland to Leeds flights
Boise to Birmingham flights
Portland to Southend flights
Redmond to Southampton flights

Top 10 airlines flying from Portland to London

Discover the top 10 airlines that operate flights from Portland to London. 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 May 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$491Average$808FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$580Average$956FlexibilityNo cancel feeOn-time67%
IberiaCheapest$584Average$780FlexibilityNo cancel feeOn-time77%
DeltaCheapest$612Average$881FlexibilityNo cancel feeOn-timeN/A
British AirwaysCheapest$616Average$895FlexibilityNo cancel feeOn-time70%
KLMCheapest$617Average$981FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$619Average$906FlexibilityNo cancel feeOn-time71%
Virgin AtlanticCheapest$622Average$818FlexibilityNo cancel feeOn-time72%
FinnairCheapest$629Average$793FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$645Average$860FlexibilityNo cancel feeOn-time69%

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