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Cheap flights from Portland to London from $275

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 12/2. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Virgin Atlantic Logo
3:19 pm - 12:50 pmPDX-LHR
13h 31m1 stop
Virgin Atlantic Logo
6:30 am - 11:25 amLHR-PDX
12h 55m1 stop
$541Virgin Atlantic
Find Deal
Mon, Nov 3 - Wed, Nov 19
Virgin Atlantic Logo
3:19 pm - 12:50 pmPDX-LHR
13h 31m1 stop
Virgin Atlantic Logo
6:30 am - 11:25 amLHR-PDX
12h 55m1 stop
$543Virgin Atlantic
Find Deal
Mon, Nov 3 - Wed, Nov 19
Icelandair Logo
2:45 pm - 7:30 pmPDX-LHR
20h 45m1 stop
Icelandair Logo
12:15 pm - 5:00 pmLHR-PDX
12h 45m1 stop
$545Icelandair
Find Deal
Tue, Nov 4 - Fri, Nov 21
Icelandair Logo
2:45 pm - 7:30 pmPDX-LHR
20h 45m1 stop
Icelandair Logo
8:35 pm - 5:00 pmLHR-PDX
28h 25m1 stop
$546Icelandair
Find Deal
Tue, Nov 4 - Tue, Nov 25
Icelandair Logo
2:45 pm - 7:30 pmPDX-LHR
20h 45m1 stop
Icelandair Logo
8:35 pm - 5:00 pmLHR-PDX
28h 25m1 stop
$548Icelandair
Find Deal
Tue, Nov 4 - Tue, Nov 11
Iberia Logo
5:45 pm - 11:20 amPDX-LHR
9h 35mnonstop
Iberia Logo
7:40 pm - 11:45 amLHR-PDX
24h 05m2 stops
$575Iberia
Find Deal
Wed, Jan 14 - Wed, Jan 21
Iberia Logo
7:40 am - 8:15 amPDX-LHR
16h 35m1 stop
Iberia Logo
7:05 pm - 11:45 amLHR-PDX
24h 40m2 stops
$579Iberia
Find Deal
Wed, Jan 14 - Wed, Jan 21
British Airways Logo
5:45 pm - 11:20 amPDX-LHR
9h 35mnonstop
British Airways Logo
1:45 pm - 3:55 pmLHR-PDX
10h 10mnonstop
$588British Airways
Find Deal
Wed, Jan 14 - Wed, Jan 21
British Airways Logo
5:45 pm - 11:20 amPDX-LHR
9h 35mnonstop
British Airways Logo
10:05 am - 7:10 pmLHR-PDX
17h 05m1 stop
$590British Airways
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Wed, Nov 5 - Thu, Nov 13
American Airlines Logo
5:45 pm - 11:20 amPDX-LHR
9h 35mnonstop
American Airlines Logo
10:05 am - 9:20 pmLHR-PDX
19h 15m1 stop
$596American Airlines
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Wed, Nov 5 - Thu, Nov 13

Virgin Atlantic flights from Portland to London Heathrow Airport

Our best Virgin Atlantic deals on Portland to London Heathrow Airport flight tickets
Virgin Atlantic
Nov 3
PDX3:19 pmPortland
13h 31m
1 stop
LHR12:50 pmLondon Heathrow
Nov 19
LHR6:30 amLondon Heathrow
12h 55m
1 stop
PDX11:25 amPortland
$541
Find similar
Virgin Atlantic
Nov 3
PDX3:19 pmPortland
13h 31m
1 stop
LHR12:50 pmLondon Heathrow
Nov 19
LHR6:30 amLondon Heathrow
12h 55m
1 stop
PDX11:25 amPortland
$543
Find similar
Virgin Atlantic
Jan 14
PDX1:45 pmPortland
12h 15m
1 stop
LHR10:00 amLondon Heathrow
Jan 30
LHR6:30 amLondon Heathrow
12h 55m
1 stop
PDX11:25 amPortland
$557
Find similar

Icelandair flights from Portland to London Heathrow Airport

Our best Icelandair deals on Portland to London Heathrow Airport flight tickets
Icelandair
Nov 4
PDX2:45 pmPortland
20h 45m
1 stop
LHR7:30 pmLondon Heathrow
Nov 21
LHR12:15 pmLondon Heathrow
12h 45m
1 stop
PDX5:00 pmPortland
$545
Find similar
Icelandair
Nov 4
PDX2:45 pmPortland
20h 45m
1 stop
LHR7:30 pmLondon Heathrow
Nov 25
LHR8:35 pmLondon Heathrow
28h 25m
1 stop
PDX5:00 pmPortland
$546
Find similar
Icelandair
Nov 4
PDX2:45 pmPortland
20h 45m
1 stop
LHR7:30 pmLondon Heathrow
Nov 11
LHR8:35 pmLondon Heathrow
28h 25m
1 stop
PDX5:00 pmPortland
$548
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portland to London Heathrow Airport 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, momondo users made 832,500 searches. Data last updated October 23, 2025.
Use the filters below to find and compare flights from Portland to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 11/3

3:19 pm-12:50 pm

1 stop13h 31m

London Heathrow

Wed 11/19

6:30 am-11:25 am

1 stop12h 55m

$541

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 11/3

3:19 pm-12:50 pm

1 stop13h 31m

London Heathrow

Wed 11/19

6:30 am-11:25 am

1 stop12h 55m

$543

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 11/4

2:45 pm-7:30 pm

1 stop20h 45m

London Heathrow

Fri 11/21

12:15 pm-5:00 pm

1 stop12h 45m

$545

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 11/4

2:45 pm-7:30 pm

1 stop20h 45m

London Heathrow

Tue 11/25

8:35 pm-5:00 pm

1 stop28h 25m

$546

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 11/4

2:45 pm-7:30 pm

1 stop20h 45m

London Heathrow

Tue 11/11

8:35 pm-5:00 pm

1 stop28h 25m

$548

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 1/14

5:45 pm-11:20 am

Nonstop9h 35m

London Heathrow

Wed 1/21

7:40 pm-11:45 am

2 stops24h 05m

$575

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 1/14

7:40 am-8:15 am

1 stop16h 35m

London Heathrow

Wed 1/21

7:05 pm-11:45 am

2 stops24h 40m

$579

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 1/14

5:45 pm-11:20 am

Nonstop9h 35m

London Heathrow

Wed 1/21

1:45 pm-3:55 pm

Nonstop10h 10m

$588

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 11/5

5:45 pm-11:20 am

Nonstop9h 35m

London Heathrow

Thu 11/13

10:05 am-7:10 pm

1 stop17h 05m

$590

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 11/5

5:45 pm-11:20 am

Nonstop9h 35m

London Heathrow

Thu 11/13

10:05 am-9:20 pm

1 stop19h 15m

$596

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Portland to London Heathrow Airport

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 typical price of a round-trip flight between Portland and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

The month of October is, on average, the cheapest month to fly to London Heathrow Airport from Portland, with most prices found around $685. If you’re not able to fly to London Heathrow Airport in October, then April is your next best option. Flight prices from Portland to London Heathrow Airport during April average around $691.

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

Our data shows that Sunday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $856. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,056.

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

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the afternoon. momondo users have found flights departing from Portland to London Heathrow Airport in the afternoon for as low as $814. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of $938.

What is the cheapest Portland to London Heathrow flight route?

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

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

You are more likely to see cheaper flights to London Heathrow Airport from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $838 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Portland for as low as $736 on momondo.

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

There are 4 cabin classes available to choose from on Portland to London Heathrow 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 Heathrow Airport flights?

You could potentially save up to 12% on your flight if you consider stops on a Portland to London Heathrow Airport flight.

How have Portland to London Heathrow Airport flight prices changed over time?

As of October 2025, prices for Portland to London Heathrow Airport flights are approximately 21% cheaper when compared to flights at the same time last year.

When to book flights from Portland to London Heathrow Airport

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

Cheap Portland to London Heathrow Airport (PDX to LHR) flight deals and tips

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

Best Price Found

$575

Fastest flight time

9h 30m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Portland in the past 72 hours is $575. The best round-trip flight deal from Portland to London Heathrow Airport found on momondo in the last 72 hours is $688.
The fastest flight from Portland to London Heathrow Airport takes 9h 30m
Direct flights go from Portland to London Heathrow Airport every day.
Search flight deals

  • How far is Portland to London Heathrow by plane?

    Portland and London Heathrow are 4902.4 mi apart from one another. Typically, this will take 9h 35m by plane in normal conditions.

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

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

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

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

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Portland Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The travel and health documents you'll need for your trip to London Heathrow Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at London Heathrow Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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

  • What is the most popular airline from Portland to London Heathrow Airport?

Best airlines flying from Portland to London Heathrow Airport

Compare and see reviews for airlines that fly from Portland to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $493Free CancellationRating
7.1
561 reviews
Search Icelandair flights
DeltaPriceFrom $554Free CancellationRating
7.9
7,982 reviews
Search Delta flights
KLMPriceFrom $561Free CancellationRating
7.7
1,405 reviews
Search KLM flights
Virgin AtlanticPriceFrom $567Free CancellationRating
7.5
670 reviews
Search Virgin Atlantic flights
IberiaPriceFrom $578Free CancellationRating
7.0
2,997 reviews
Search Iberia flights
British AirwaysPriceFrom $594Free CancellationRating
6.7
7,469 reviews
Search British Airways flights
Alaska AirlinesPriceFrom $600Free CancellationRating
8.0
11,161 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $623Free CancellationRating
7.4
8,995 reviews
Search United Airlines flights
American AirlinesPriceFrom $632Free CancellationRating
7.2
11,033 reviews
Search American Airlines flights
FinnairPriceFrom $641Free CancellationRating
7.6
1,333 reviews
Search Finnair flights

  • Alaska Airlines Flights From Portland to London Heathrow Airport

    Across 3 Alaska Airlines flights from Portland to London Heathrow Airport this week, the average price was $1,408, with the best Alaska Airlines deals starting from $600 round-trip. 11,161 users have rated Alaska Airlines on momondo, with an average score of 8.0/10.

  • Finnair Flights From Portland to London Heathrow Airport

    Across 1,333 Finnair reviews on momondo, the average score is 7.6/10. Finnair flies from Portland to London Heathrow Airport about 3 times each week, with ticket deals ranging from $641 to $940. Price data is based on momondo searches in the last 72 hours.

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Luton
Dover
Slough
Guildford
Hayes
Dartford
Crawley
Stratford-upon-Avon
Brentwood
Salisbury
Chelmsford
Colchester
Folkestone
Romford
Swindon
Cobham
Wembley

Why use momondo?

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

Finding the right flight to London from Portland is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to London quick and easy, saving you time and money.

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

Yes. momondo enables you to select and highlight flights to London from Portland with this policy.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Portland.

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

Of course. momondo tracks the price of Portland to London flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

An easier way to manage your London Heathrow Airport trip

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