London

$359+ 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 10/26. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — LON
oct. 16 — oct. 231
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Cheapflights Tip: The best prices from Portland to London are usually found in October or November, booked 46 days in advance, depart on a Tuesday or Sunday 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 septiembre 16, 2025.

Round-trip from

$545
(KLM)

One-way from

$359
(KAYAK)

Popular in

June

Cheapest in

October

Average price

$727

Good round-trip deal

$673 or less

Good one-way deal

$490 or less
From Portland to London (LON)
One-way flight from Portland to London (LON)
Highest demand for flights based on searches. 22% potential increase in price ($239 potential increase over avg. RT price).
Cheapest flight prices on average. 4% potential price decrease ($37 potential savings vs. average RT price).
Average for round-trip flights in September 2025
Price to beat on a round-trip flight from Portland to London (LON).
Price to beat on a one-way flight from Portland to London (LON).

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 septiembre 16, 2025.

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.
mié. 10/225:00 amPDX - LHR
1 stop23h 20mUnited Airlines
mié. 10/296:00 pmLHR - PDX
2 stops35h 10mUnited Airlines
Deal found 9/15$545
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/176:15 amPDX - LTN
3 stops23h 20mMultiple Airlines
jue. 10/239:10 pmLTN - PDX
2 stops25h 36mMultiple Airlines
Deal found 9/16$546
This British Airways 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 British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dom. 11/25:45 pmPDX - LHR
Nonstop9h 35mBritish Airways
mié. 11/191:45 pmLHR - PDX
Nonstop10h 10mBritish Airways
Deal found 9/15$546
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/176:15 amPDX - STN
3 stops24h 05mMultiple Airlines
jue. 10/2310:55 pmSTN - PDX
2 stops23h 51mMultiple Airlines
Deal found 9/16$546
This Kiwi.com 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 10/223:20 pmPDX - LHR
1 stop12h 35mIcelandair
sáb. 11/18:35 pmLHR - PDX
1 stop28h 25mIcelandair
Deal found 9/15$547
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.
jue. 11/202:45 pmPDX - LGW
1 stop12h 10mIcelandair
dom. 12/711:55 amLGW - PDX
1 stop13h 05mIcelandair
Deal found 9/14$547
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/64:07 pmPDX - LHR
1 stop12h 13mUnited Airlines
mié. 10/222:10 pmLHR - PDX
1 stop16h 51mUnited Airlines
Deal found 9/14$548
This United Airlines 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/37:35 pmPDX - LHR
2 stops54h 05mUnited Airlines
jue. 10/162:10 pmLHR - PDX
1 stop32h 36mUnited Airlines
Deal found 9/13$549
This United 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 9/244:07 pmPDX - LHR
1 stop12h 13mUnited Airlines
mié. 10/17:45 amLHR - PDX
2 stops20h 35mUnited Airlines
Deal found 9/14$550
This Mytrip deal was found by Cheapflights users on 9/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/176:15 amPDX - LGW
3 stops28h 40mMultiple Airlines
jue. 10/239:30 pmLGW - PDX
2 stops25h 16mMultiple Airlines
Deal found 9/16$550
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.
mié. 10/85:30 amPDX - LHR
2 stops21h 40mUnited Airlines
mar. 10/212:10 pmLHR - PDX
1 stop32h 36mUnited Airlines
Deal found 9/15$551
This Gotogate 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 10/67:25 pmPDX - LHR
Nonstop9h 35mBritish Airways
mié. 10/228:20 amLHR - PDX
1 stop16h 44mBritish Airways
Deal found 9/14$552

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 septiembre 16, 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

mar. 10/14

3:50 pm-11:10 am

2 stops35h 20m

London Heathrow

mar. 11/4

2:30 pm-2:45 pm

1 stop32h 15m

$545

PortlandLondon

PDX - LHR

PDXLHR

Portland

dom. 10/5

1:40 pm-2:15 pm

1 stop16h 35m

London Heathrow

mar. 10/14

7:15 pm-11:20 am

1 stop24h 05m

$545

PortlandLondon

PDX - STN

PDXSTN

Portland

vie. 10/17

6:15 am-2:20 pm

3 stops24h 05m

London Stansted

jue. 10/23

10:55 pm-2:46 pm

2 stops23h 51m

$546

PortlandLondon

PDX - LHR

PDXLHR

Portland

mié. 10/22

3:25 pm-1:20 pm

1 stop13h 55m

London Heathrow

vie. 10/31

6:50 am-8:29 pm

2 stops20h 39m

$546

PortlandLondon

PDX - LGW

PDXLGW

Portland

jue. 11/20

2:45 pm-10:55 am

1 stop12h 10m

London Gatwick

mié. 12/3

11:55 am-5:00 pm

1 stop13h 05m

$547

PortlandLondon

PDX - LGW

PDXLGW

Portland

jue. 11/20

2:45 pm-10:55 am

1 stop12h 10m

London Gatwick

dom. 12/7

11:55 am-5:00 pm

1 stop13h 05m

$547

PortlandLondon

PDX - LHR

PDXLHR

Portland

mié. 10/8

7:30 am-7:25 am

1 stop15h 55m

London Heathrow

mié. 10/22

2:10 pm-6:46 pm

1 stop12h 36m

$551

PortlandLondon

PDX - LHR

PDXLHR

Portland

lun. 2/9

6:15 am-7:05 am

1 stop16h 50m

London Heathrow

mié. 2/18

6:30 am-11:25 am

1 stop12h 55m

$552

PortlandLondon

PDX - LHR

PDXLHR

Portland

dom. 1/25

12:55 am-7:05 am

1 stop22h 10m

London Heathrow

vie. 2/6

6:30 am-11:25 am

1 stop12h 55m

$553

PortlandLondon

PDX - LHR

PDXLHR

Portland

lun. 10/6

1:40 pm-8:00 pm

1 stop22h 20m

London Heathrow

mié. 10/22

6:15 am-4:45 pm

2 stops18h 30m

$554

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 60 results
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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 rush 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 September 12, 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 46 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 $1,097). 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 septiembre 16, 2025.

Unlike in the afternoon, when flights are generally more expensive, you can save up to 14% 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 septiembre 16, 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).

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 septiembre 16, 2025.
See what other customers who have flown with Delta, American Airlines, and Icelandair from Portland 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.
8.0
Very good

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

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!
8.0
Very good
8.0
Very good

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

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!
8.0
Very good

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

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!
8.0
Very good

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

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!
8.0
Very good

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

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!
8.0
Very good

Overall

8.0

Crew

8.5

Boarding

8.2

Comfort

7.9

Food

7.3

Entertainment

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. 13 airlines have flights to London from Portland on a regular basis.

  • How long is the flight from Portland to London?

    United Airlines, Virgin Atlantic, and Icelandair can get you from Portland to London in just under 12h 10m. Your travel time can differ by up to 23h 10m. There are 4921 mi between Portland and London. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Cheapflights users have booked flights from Portland to London round-trip from $490. Other airlines that can offer you cheap pricing are Delta, from $554, and KLM, from $561. You may be able to fly from Portland to London for 39% 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 Scandinavian Airlines ($359), WestJet ($379), and United Airlines ($394).

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

  • 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 (77%), Alaska Airlines (77%) and Aer Lingus (77%).

  • What are the cheapest flights from Portland to London?

    The cheapest flight price from Portland to London is $420. On average you can expect to pay $1,194. The most popular route, (Portland - London Heathrow), can usually be booked for $471.

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

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

    Harpa, Hallgrímskirkja, and Laugardalslaug Geothermal Pool are the most popular attractions in Reykjavik if you're in need of something to do during your layover. Travelers on a layover in Reykjavik can visit Harpa, Hallgrímskirkja, and Laugardalslaug Geothermal Pool, by traveling 23.3 mi, 23.2 mi, and 24.6 mi, respectively after landing at Reykjavik Keflavik Intl. Travelers can book a car rental at Reykjavik Keflavik Intl for about $56 per day to make their sightseeing more efficient.

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

  • 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 $1,097). 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 London?

Book flights to London if you plan to visit one of these locations
Hounslow
Hayes
Southend-on-Sea
Harrow
Canterbury
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Gatwick
Borehamwood
Aylesbury
Bedford
Wembley
Folkestone
Chichester
Eastbourne
Sutton

Browse thousands of different options on Cheapflights for your next trip

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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 septiembre 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$490Average$759FlexibilityNo cancel feeOn-time76%
DeltaCheapest$554Average$873FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$561Average$669FlexibilityNo cancel feeOn-time75%
Virgin AtlanticCheapest$567Average$776FlexibilityNo cancel feeOn-time72%
IberiaCheapest$578Average$778FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$595Average$844FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$623Average$873FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$628Average$881FlexibilityNo cancel feeOn-time71%
FinnairCheapest$641Average$818FlexibilityNo cancel feeOn-time76%
Air CanadaCheapest$704Average$967FlexibilityNo cancel feeOn-time67%

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