Cheap flights from Portland to London from $359

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 10/26. 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

United Airlines Logo
5:00 am - 12:20 pmPDX-LHR
23h 20m1 stop
United Airlines Logo
6:00 pm - 10:10 pmLHR-PDX
35h 10m2 stops
$545United Airlines
Find Deal
Wed, Oct 22 - Wed, Oct 29
Air Canada Logo
7:00 pm - 11:50 amPDX-LHR
33h 50m1 stop
Air Canada Logo
2:30 pm - 2:45 pmLHR-PDX
32h 15m1 stop
$546Air Canada
Find Deal
Sat, Nov 1 - Wed, Nov 19
British Airways Logo
7:25 pm - 1:00 pmPDX-LHR
9h 35mnonstop
British Airways Logo
3:40 pm - 5:35 pmLHR-PDX
9h 55mnonstop
$547British Airways
Find Deal
Wed, Oct 15 - Thu, Oct 23
American Airlines Logo
7:25 pm - 1:00 pmPDX-LHR
9h 35mnonstop
American Airlines Logo
3:40 pm - 5:35 pmLHR-PDX
9h 55mnonstop
$548American Airlines
Find Deal
Mon, Oct 6 - Wed, Oct 22
Lufthansa Logo
3:25 pm - 1:20 pmPDX-LHR
13h 55m1 stop
Lufthansa Logo
6:30 am - 6:46 pmLHR-PDX
20h 16m2 stops
$549Lufthansa
Find Deal
Fri, Oct 17 - Sun, Oct 19
United Airlines Logo
10:50 am - 9:40 amPDX-LHR
14h 50m1 stop
United Airlines Logo
7:45 am - 8:20 pmLHR-PDX
20h 35m2 stops
$550United Airlines
Find Deal
Wed, Oct 8 - Tue, Oct 14
Icelandair Logo
2:45 pm - 7:30 pmPDX-LHR
20h 45m1 stop
Icelandair Logo
8:35 pm - 5:00 pmLHR-PDX
28h 25m1 stop
$553Icelandair
Find Deal
Thu, Nov 20 - Sat, Dec 6
Delta Logo
3:19 pm - 11:20 amPDX-LHR
12h 01m1 stop
Delta Logo
6:15 am - 4:45 pmLHR-PDX
18h 30m2 stops
$554Delta
Find Deal
Mon, Oct 6 - Wed, Oct 22
British Airways Logo
7:25 pm - 1:00 pmPDX-LHR
9h 35mnonstop
British Airways Logo
8:20 am - 5:04 pmLHR-PDX
16h 44m1 stop
$556British Airways
Find Deal
Tue, Oct 14 - Tue, Oct 21
Delta Logo
5:50 pm - 2:15 pmPDX-LHR
12h 25m1 stop
Delta Logo
1:25 pm - 10:40 pmLHR-PDX
17h 15m1 stop
$561Delta
Find Deal
Sun, Oct 12 - Wed, Oct 22

Delta flights from Portland to London Heathrow Airport

Our best Delta deals on Portland to London Heathrow Airport flight tickets
Delta
Sep 22
PDX7:15 amPortland
15h 10m
1 stop
LHR6:25 amLondon Heathrow
Oct 3
LHR6:15 amLondon Heathrow
18h 55m
2 stops
PDX5:10 pmPortland
Delta
Oct 6
PDX3:19 pmPortland
12h 01m
1 stop
LHR11:20 amLondon Heathrow
Oct 22
LHR6:15 amLondon Heathrow
18h 30m
2 stops
PDX4:45 pmPortland
Delta
Oct 12
PDX5:50 pmPortland
12h 25m
1 stop
LHR2:15 pmLondon Heathrow
Oct 22
LHR1:25 pmLondon Heathrow
17h 15m
1 stop
PDX10:40 pmPortland

Air Canada flights from Portland to London Heathrow Airport

Our best Air Canada deals on Portland to London Heathrow Airport flight tickets
Air Canada
Nov 1
PDX7:00 pmPortland
33h 50m
1 stop
LHR11:50 amLondon Heathrow
Nov 19
LHR2:30 pmLondon Heathrow
32h 15m
1 stop
PDX2:45 pmPortland
Air Canada
Sep 23
PDX7:35 pmPortland
26h 55m
2 stops
LHR6:30 amLondon Heathrow
Oct 2
LHR2:05 pmLondon Heathrow
16h 56m
2 stops
PDX11:01 pmPortland
Air Canada
Sep 23
PDX2:15 pmPortland
32h 15m
2 stops
LHR6:30 amLondon Heathrow
Sep 30
LHR10:15 amLondon Heathrow
20h 46m
2 stops
PDX11:01 pmPortland

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 September 17, 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

Wed 10/22

5:00 am-12:20 pm

1 stop23h 20m

London Heathrow

Wed 10/29

6:00 pm-10:10 pm

2 stops35h 10m

$545

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sat 11/1

7:00 pm-11:50 am

1 stop33h 50m

London Heathrow

Wed 11/19

2:30 pm-2:45 pm

1 stop32h 15m

$546

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 10/15

7:25 pm-1:00 pm

Nonstop9h 35m

London Heathrow

Thu 10/23

3:40 pm-5:35 pm

Nonstop9h 55m

$547

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 10/6

7:25 pm-1:00 pm

Nonstop9h 35m

London Heathrow

Wed 10/22

3:40 pm-5:35 pm

Nonstop9h 55m

$548

PortlandLondon

PDX - LHR

PDXLHR

Portland

Fri 10/17

3:25 pm-1:20 pm

1 stop13h 55m

London Heathrow

Sun 10/19

6:30 am-6:46 pm

2 stops20h 16m

$549

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 10/8

10:50 am-9:40 am

1 stop14h 50m

London Heathrow

Tue 10/14

7:45 am-8:20 pm

2 stops20h 35m

$550

PortlandLondon

PDX - LHR

PDXLHR

Portland

Thu 11/20

2:45 pm-7:30 pm

1 stop20h 45m

London Heathrow

Sat 12/6

8:35 pm-5:00 pm

1 stop28h 25m

$553

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 10/6

3:19 pm-11:20 am

1 stop12h 01m

London Heathrow

Wed 10/22

6:15 am-4:45 pm

2 stops18h 30m

$554

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 10/14

7:25 pm-1:00 pm

Nonstop9h 35m

London Heathrow

Tue 10/21

8:20 am-5:04 pm

1 stop16h 44m

$556

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 10/12

5:50 pm-2:15 pm

1 stop12h 25m

London Heathrow

Wed 10/22

1:25 pm-10:40 pm

1 stop17h 15m

$561

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 $678. 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 $690.

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

Our data shows that Tuesday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $854. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,067.

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 $813. 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 $937.

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 $742 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 September 2025, prices for Portland to London Heathrow Airport flights are approximately 12% 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

$490

Fastest flight time

9h 35m

Direct flights

Every day
The best one-way flight to London Heathrow Airport from Portland in the past 72 hours is $490. The best round-trip flight deal from Portland to London Heathrow Airport found on momondo in the last 72 hours is $673.
The fastest flight from Portland to London Heathrow Airport takes 9h 35m
Direct flights go from Portland to London Heathrow Airport every day.
  • 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 $490Free CancellationRating
7.0
545 reviews
Search Icelandair flights
DeltaPriceFrom $554Free CancellationRating
7.9
7,961 reviews
Search Delta flights
KLMPriceFrom $561Free CancellationRating
7.8
1,386 reviews
Search KLM flights
Virgin AtlanticPriceFrom $567Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
IberiaPriceFrom $578Free CancellationRating
7.0
2,925 reviews
Search Iberia flights
British AirwaysPriceFrom $595Free CancellationRating
6.7
7,367 reviews
Search British Airways flights
United AirlinesPriceFrom $623Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
American AirlinesPriceFrom $628Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
FinnairPriceFrom $641Free CancellationRating
7.6
1,324 reviews
Search Finnair flights
Air CanadaPriceFrom $704Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
  • Alaska Airlines Flights From Portland to London Heathrow Airport

    Across 7 Alaska Airlines flights from Portland to London Heathrow Airport this week, the average price was $1,433, with the best Alaska Airlines deals starting from $914 round-trip. 10,000 users have rated Alaska Airlines on momondo, with an average score of 8.0/10.

  • Finnair Flights From Portland to London Heathrow Airport

    Across 1,324 Finnair reviews on momondo, the average score is 7.6/10. Finnair flies from Portland to London Heathrow Airport about 7 times each week, with ticket deals ranging from $641 to $818. 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
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Watford

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.

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1 adult
Fri 10/17
Fri 10/24

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