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

WestJet is the most popular carrier operating from Portland to London

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

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 12h 14m.

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

Flights via Phoenix (PHX) offer the lowest average round-trip price of $538.

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

Seattle (SEA) was the most common stop: 60% of momondo users choosing 1-stop flights on this route connected there.

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

Denver (DEN) has the shortest average layover time for this route: 1h 10m.

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

As of August 2025, 7 flights take off from Portland and land in London each day. The most common flight departure time for this route is 7:00PM, with 100% of daily flights taking off in the evening.

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

The number of flights available between Portland and London is 49 per week as of August 2025. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.

What airlines fly to London?

British Airways, Iberia and American Airlines are the top three most popular airlines that fly to London from Portland according to our data. British Airways is the first choice among our users, with 59% of people opting to fly with this airline when traveling to London. Keep in mind that there are 13 different airlines that fly to London on a routine basis, so you have a few additional options to choose from.

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

Prices for flights from Portland Airport to London are refreshed on a daily basis.

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

The number of operators available for flights from Portland Airport to London is 13 as of August 2025.

How old do you have to be to fly from Portland Airport to London?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London.

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

The required travel and health documents for your London trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$271 Cheap Flights from Portland to London (PDX-LON) in 2025

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Portland to London (PDX-LON)

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

6:15 am - 12:00 pmPDX-STN

21h 45m3 stops

9:45 pm - 6:46 pmSTN-PDX

29h 01m3 stops

$477

Find Deal

Tue, Sep 23 - Tue, Sep 30

2:45 pm - 10:55 amPDX-LGW

12h 10m1 stop

11:55 am - 5:00 pmLGW-PDX

13h 05m1 stop

$491Icelandair

Find Deal

Tue, Nov 4 - Wed, Nov 12

2:45 pm - 10:55 amPDX-LGW

12h 10m1 stop

11:55 am - 5:00 pmLGW-PDX

13h 05m1 stop

$492Icelandair

Find Deal

Thu, Nov 6 - Mon, Nov 10

7:25 pm - 1:00 pmPDX-LHR

9h 35mnonstop

8:50 am - 7:43 pmLHR-PDX

18h 53m2 stops

$520American Airlines

Find Deal

Sun, Oct 5 - Tue, Oct 21

8:45 am - 6:25 amPDX-LHR

13h 40m1 stop

1:45 pm - 4:55 pmLHR-PDX

10h 10mnonstop

$525British Airways

Find Deal

Wed, Oct 22 - Fri, Oct 31

8:45 am - 6:25 amPDX-LHR

13h 40m1 stop

1:45 pm - 3:55 pmLHR-PDX

10h 10mnonstop

$528British Airways

Find Deal

Tue, Oct 14 - Wed, Nov 5

12:55 pm - 8:50 amPDX-LCY

11h 55m1 stop

8:10 pm - 11:20 amLCY-PDX

23h 10m1 stop

$569Virgin Atlantic

Find Deal

Sun, Oct 5 - Tue, Oct 21

12:55 pm - 5:20 pmPDX-LCY

20h 25m1 stop

9:20 am - 10:40 pmLCY-PDX

21h 20m2 stops

$605Virgin Atlantic

Find Deal

Sun, Oct 5 - Tue, Oct 21

1:40 pm - 4:40 pmPDX-LCY

19h 00m2 stops

10:00 am - 7:19 pmLCY-PDX

17h 19m2 stops

$609Delta

Find Deal

Mon, Sep 22 - Fri, Oct 10

6:15 am - 8:10 amPDX-LCY

17h 55m2 stops

8:40 am - 5:37 pmLCY-PDX

16h 57m2 stops

$659Delta

Find Deal

Fri, Nov 14 - Thu, Nov 27

Air Canada flights from Portland to London

Our best Air Canada deals on Portland to London flight tickets

Air Canada

Oct 5

PDX9:55 amPortland

15h 40m

2 stops

LHR9:35 amLondon Heathrow

Oct 21

LHR2:10 pmLondon Heathrow

32h 36m

1 stop

PDX2:46 pmPortland

$506

Find similar

Air Canada

Oct 5

PDX9:55 amPortland

17h 55m

2 stops

LHR11:50 amLondon Heathrow

Oct 21

LHR2:10 pmLondon Heathrow

12h 36m

1 stop

PDX6:46 pmPortland

$518

Find similar

Air Canada

Oct 22

PDX3:25 pmPortland

13h 55m

1 stop

LHR1:20 pmLondon Heathrow

Oct 30

LHR3:00 pmLondon Heathrow

25h 15m

2 stops

PDX9:15 amPortland

$529

Find similar

United Airlines flights from Portland to London

Our best United Airlines deals on Portland to London flight tickets

United Airlines

Oct 5

PDX5:30 amPortland

17h 55m

1 stop

LHR7:25 amLondon Heathrow

Oct 21

LHR2:10 pmLondon Heathrow

12h 36m

1 stop

PDX6:46 pmPortland

$511

Find similar

United Airlines

Oct 22

PDX9:55 amPortland

19h 25m

1 stop

LHR1:20 pmLondon Heathrow

Oct 31

LHR11:10 amLondon Heathrow

31h 38m

2 stops

PDX11:48 amPortland

$539

Find similar

United Airlines

Oct 22

PDX8:35 amPortland

17h 05m

1 stop

LHR9:40 amLondon Heathrow

Oct 30

LHR6:00 pmLondon Heathrow

35h 10m

2 stops

PDX10:10 pmPortland

$543

Find similar

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PDX - STN

PDXSTN

Portland

Tue 9/23

6:15 am-12:00 pm

3 stops21h 45m

London Stansted

Tue 9/30

9:45 pm-6:46 pm

3 stops29h 01m

$477

PortlandLondon

PDX - LGW

PDXLGW

Portland

Tue 11/4

2:45 pm-10:55 am

1 stop12h 10m

London Gatwick

Wed 11/12

11:55 am-5:00 pm

1 stop13h 05m

$491

PortlandLondon

PDX - LGW

PDXLGW

Portland

Thu 11/6

2:45 pm-10:55 am

1 stop12h 10m

London Gatwick

Mon 11/10

11:55 am-5:00 pm

1 stop13h 05m

$492

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 10/5

7:25 pm-1:00 pm

Nonstop9h 35m

London Heathrow

Tue 10/21

8:50 am-7:43 pm

2 stops18h 53m

$520

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 10/22

8:45 am-6:25 am

1 stop13h 40m

London Heathrow

Fri 10/31

1:45 pm-4:55 pm

Nonstop10h 10m

$525

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 10/14

8:45 am-6:25 am

1 stop13h 40m

London Heathrow

Wed 11/5

1:45 pm-3:55 pm

Nonstop10h 10m

$528

PortlandLondon

PDX - LCY

PDXLCY

Portland

Sun 10/5

12:55 pm-8:50 am

1 stop11h 55m

London City

Tue 10/21

8:10 pm-11:20 am

1 stop23h 10m

$569

PortlandLondon

PDX - LCY

PDXLCY

Portland

Sun 10/5

12:55 pm-5:20 pm

1 stop20h 25m

London City

Tue 10/21

9:20 am-10:40 pm

2 stops21h 20m

$605

PortlandLondon

PDX - LCY

PDXLCY

Portland

Mon 9/22

1:40 pm-4:40 pm

2 stops19h 00m

London City

Fri 10/10

10:00 am-7:19 pm

2 stops17h 19m

$609

PortlandLondon

PDX - LCY

PDXLCY

Portland

Fri 11/14

6:15 am-8:10 am

2 stops17h 55m

London City

Thu 11/27

8:40 am-5:37 pm

2 stops16h 57m

$659

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Portland to London

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Layovers

Other information

What is the cheapest month to fly to London?

The cheapest month to fly to London from Portland is in October. Flight prices, which tend to average around $667, are often lower during this time because this is during the off-season. The month of November is another great option to travel to London, with average flight prices from Portland averaging around $676.

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

The cheapest day to depart from Portland to London is on a Tuesday. Travelers who choose to depart for London on a Tuesday will often find tickets for as low as $848. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,070. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

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

Flying to London from Portland in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $809 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $944. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Portland to London flight route?

Fly from Portland to London Heathrow for the best Portland - London flight prices

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

You are more likely to see cheaper flights to London from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around $839 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Portland for as low as $763 on momondo.

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

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

Can stopping save me money on Portland to London flights?

You could potentially save up to 24% on your flight if you consider stops on a Portland to London flight.

How have Portland to London flight prices changed over time?

As of August 2025, prices for Portland to London flights are approximately 40% cheaper when compared to flights at the same time last year.

When to book flights from Portland to London

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to London according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Portland to London (PDX to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to London

Best Price Found	$271
Fastest flight time	9h 35m
Direct flights	Every day
Airports in London	6 airports

The best one-way flight to London from Portland in the past 72 hours is $271. The best round-trip flight deal from Portland to London found on momondo in the last 72 hours is $477.

The fastest flight from Portland to London takes 9h 35m

Direct flights go from Portland to London every day.

There are 6 airports near London: London City (LCY), London Heathrow (LHR), London Luton (LTN), London Stansted (STN), London Gatwick (LGW), London Southend (SEN)

Search flight deals

How far is Portland to London by plane?
The distance between Portland and London is about 4909.8 mi. Typically, this will take 9h 35m by plane in normal conditions.
When did momondo last update prices for flights from Portland Airport to London?
Prices for flights from Portland Airport to London are refreshed on a daily basis.
How many operators does momondo search for flights from Portland Airport to London?
The number of operators available for flights from Portland Airport to London is 13 as of August 2025.
How old do you have to be to fly from Portland Airport to London?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London.
What documentation or ID do you need to fly to London?
The required travel and health documents for your London trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Portland to London?
momondo data reveals that the most frequently booked plane model on the route from Portland to London is Boeing 787-10 Dreamliner, representing 57.77% of all bookings. The subsequent popular models are Boeing 787-8 Dreamliner at 29.98%, Boeing 787-9 Dreamliner at 4.39%, and Boeing 787 Dreamliner at 2.25%.
What is the most popular airline from Portland to London?
Based on momondo bookings for flights between Portland and London, the leading airline is British Airways, making up 39% of the total bookings. Other popular airlines include Iberia with 16%, Icelandair with 12%, and American Airlines with 8%.

Best airlines flying from Portland to London

Compare and see reviews for airlines that fly from Portland to London with momondo

Airline	Rating	Free Cancellation	Price
Icelandair	PriceFrom $491	Free Cancellation	Rating 7.0 526 reviews	Search Icelandair flights
KLM	PriceFrom $561	Free Cancellation	Rating 7.8 1,381 reviews	Search KLM flights
Virgin Atlantic	PriceFrom $567	Free Cancellation	Rating 7.4 657 reviews	Search Virgin Atlantic flights
Iberia	PriceFrom $583	Free Cancellation	Rating 7.0 2,878 reviews	Search Iberia flights
Delta	PriceFrom $600	Free Cancellation	Rating 8.0 7,980 reviews	Search Delta flights
British Airways	PriceFrom $606	Free Cancellation	Rating 6.6 7,266 reviews	Search British Airways flights
United Airlines	PriceFrom $623	Free Cancellation	Rating 7.4 8,916 reviews	Search United Airlines flights
American Airlines	PriceFrom $626	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Finnair	PriceFrom $641	Free Cancellation	Rating 7.6 1,321 reviews	Search Finnair flights
Air Canada	PriceFrom $660	Free Cancellation	Rating 7.1 9,949 reviews	Search Air Canada flights

Alaska Airlines Flights From Portland to London
The lowest priced Alaska Airlines flight from Portland to London from the last 72 hours was $870. Generally, Alaska Airlines has 7 flights on this route every week with an average price of $1,408. Alaska Airlines is rated 8.0/10 by our users.
Finnair Flights From Portland to London
Across 1,321 Finnair reviews on momondo, the average score is 7.6/10. Finnair flies from Portland to London about 7 times each week, with ticket deals ranging from $641 to $815. Price data is based on momondo searches in the last 72 hours.

Hounslow

Gatwick

Dover

Slough

Luton

Guildford

Milton Keynes

Dartford

Crawley

Hayes

Chelmsford

Stansted

Brentwood

Ilford

Colchester

Folkestone

Watford

Richmond

Canterbury

Wembley

Why use momondo?

Why should I use momondo to find a flight deal from Portland to London?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Portland.

Can I find flights from Portland to London with flexible booking policies on momondo?

All flight searches from Portland to London on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Portland to London?

momondo helps you find the best flight between Portland and London by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Portland to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Portland to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your London trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Tue 8/19

Tue 8/26

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

London City Airport

London Gatwick Airport

London Heathrow Airport

London Luton Airport

London Southend Airport

London Stansted Airport

Popular cities in the United Kingdom

Flights to Manchesterfrom $362

Flights to Edinburghfrom $385

Flights to Birminghamfrom $398

Flights to Glasgowfrom $406

Flights to Belfastfrom $475

Flights to Newcastle upon Tynefrom $456

Flights to Bristolfrom $474

Flights to Invernessfrom $402

Flights to Liverpoolfrom $461

Flights to Aberdeenfrom $507

Flights to Leedsfrom $456

Flights to Cardifffrom $520

Cheap flights from Portland to London from $271

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to London departing on 9/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Portland to London (PDX-LON)

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Air Canada flights from Portland to London

Our best Air Canada deals on Portland to London flight tickets

United Airlines flights from Portland to London

Our best United Airlines deals on Portland to London flight tickets

momondo Fare Finder

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

See travel insights to London from

How to get the cheapest flight ticket from Portland to London

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to London?

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

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

What is the cheapest Portland to London flight route?

Fly from Portland to London Heathrow for the best Portland - London flight prices

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

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

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

Can stopping save me money on Portland to London flights?

You could potentially save up to 24% on your flight if you consider stops on a Portland to London flight.

How have Portland to London flight prices changed over time?

As of August 2025, prices for Portland to London flights are approximately 40% cheaper when compared to flights at the same time last year.

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

WestJet is the most popular carrier operating from Portland to London

What airlines fly to London?

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

Seattle (SEA) was the most common stop: 60% of momondo users choosing 1-stop flights on this route connected there.

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

Flights via Phoenix (PHX) offer the lowest average round-trip price of $538.

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

Flights connecting via Denver (DEN) have the shortest average one-way travel time: 12h 14m.

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

Denver (DEN) has the shortest average layover time for this route: 1h 10m.

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

As of August 2025, 7 flights take off from Portland and land in London each day. The most common flight departure time for this route is 7:00PM, with 100% of daily flights taking off in the evening.

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

The number of flights available between Portland and London is 49 per week as of August 2025. The most frequent departure day is Mon, with 14% of weekly flights leaving on this day.

When to book flights from Portland to London

Cheap Portland to London (PDX to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to London

Best Price Found

Fastest flight time

Direct flights

Airports in London

How far is Portland to London by plane?

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

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

How old do you have to be to fly from Portland Airport to London?

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

What is the most popular plane model from Portland to London?

What is the most popular airline from Portland to London?

Best airlines flying from Portland to London

Compare and see reviews for airlines that fly from Portland to London with momondo

Alaska Airlines Flights From Portland to London

Finnair Flights From Portland to London

Traveling to a place near London?

Why use momondo?

Why should I use momondo to find a flight deal from Portland to London?

Can I find flights from Portland to London with flexible booking policies on momondo?

How can momondo help me find flights from Portland to London?

I’m not ready to book a flight from Portland to London right now. Can momondo alert me if prices change?

An easier way to manage your London trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United Kingdom