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Cheap flights from Portland to London from $321

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 4/15. 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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Find the cheapest flights from Portland to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Icelandair Logo
3:30 pm - 11:55 am
PDX
-
LHR
12h 25m
1 stop
Icelandair Logo
9:25 pm - 6:00 pm
LHR
-
PDX
28h 35m
1 stop
$595Icelandair
Tue, Mar 31 - Tue, Apr 7
British Airways Logo
6:00 am - 6:55 am
PDX
-
LHR
16h 55m
1 stop
British Airways Logo
1:45 pm - 3:55 pm
LHR
-
PDX
10h 10mnonstop
$596British Airways
Tue, Feb 10 - Wed, Feb 25
Air Canada Logo
3:15 pm - 11:50 am
PDX
-
LHR
13h 35m
1 stop
Air Canada Logo
1:25 pm - 9:15 am
LHR
-
PDX
26h 50m
2 stops
$597Air Canada
Sun, Mar 8 - Fri, Mar 20
British Airways Logo
6:00 am - 6:55 am
PDX
-
LHR
16h 55m
1 stop
British Airways Logo
1:45 pm - 3:55 pm
LHR
-
PDX
10h 10mnonstop
$598British Airways
Sun, Feb 8 - Fri, Mar 6
British Airways Logo
12:35 pm - 11:40 am
PDX
-
LHR
15h 05m
1 stop
British Airways Logo
3:45 pm - 12:17 am
LHR
-
PDX
16h 32m
1 stop
$599British Airways
Tue, Feb 3 - Fri, Feb 13
Icelandair Logo
3:30 pm - 11:55 am
PDX
-
LHR
12h 25m
1 stop
Icelandair Logo
9:25 pm - 6:00 pm
LHR
-
PDX
28h 35m
1 stop
$600Icelandair
Tue, Mar 31 - Sat, Apr 11
Lufthansa Logo
9:50 am - 10:10 am
PDX
-
LHR
16h 20m
2 stops
Lufthansa Logo
7:30 pm - 6:55 pm
LHR
-
PDX
31h 25m
2 stops
$601Lufthansa
Mon, Feb 9 - Mon, Feb 16
Multiple Airlines Logo
7:05 pm - 8:35 am
PDX
-
LHR
29h 30m
2 stops
Multiple Airlines Logo
8:45 am - 10:29 pm
LHR
-
PDX
21h 44m
2 stops
$602Multiple Airlines
Tue, Mar 31 - Tue, Apr 7
British Airways Logo
5:45 pm - 11:20 am
PDX
-
LHR
9h 35mnonstop
British Airways Logo
3:45 pm - 12:17 am
LHR
-
PDX
16h 32m
1 stop
$603British Airways
Mon, Feb 9 - Tue, Mar 3
British Airways Logo
5:45 pm - 11:20 am
PDX
-
LHR
9h 35mnonstop
British Airways Logo
2:10 pm - 12:17 am
LHR
-
PDX
18h 07m
1 stop
$604British Airways
Sun, Feb 22 - Wed, Mar 4

Air Canada flights from Portland to London Heathrow Airport

Our best Air Canada deals on Portland to London Heathrow Airport flight tickets
Air Canada
Mar 8
PDX3:15 pmPortland
13h 35m
1 stop
LHR11:50 amLondon Heathrow
Mar 20
LHR1:25 pmLondon Heathrow
26h 50m
2 stops
PDX9:15 amPortland
$597
Air Canada
Feb 1
PDX7:05 pmPortland
28h 05m
2 stops
LHR7:10 amLondon Heathrow
Feb 10
LHR1:25 pmLondon Heathrow
33h 15m
2 stops
PDX2:40 pmPortland
$600
Air Canada
Apr 22
PDX3:15 pmPortland
14h 05m
1 stop
LHR1:20 pmLondon Heathrow
Apr 29
LHR3:05 pmLondon Heathrow
31h 35m
1 stop
PDX2:40 pmPortland
$610

Lufthansa flights from Portland to London Heathrow Airport

Our best Lufthansa deals on Portland to London Heathrow Airport flight tickets
Lufthansa
Feb 9
PDX9:50 amPortland
16h 20m
2 stops
LHR10:10 amLondon Heathrow
Feb 16
LHR7:30 pmLondon Heathrow
31h 25m
2 stops
PDX6:55 pmPortland
$601
Lufthansa
Jan 30
PDX9:50 amPortland
18h 00m
1 stop
LHR11:50 amLondon Heathrow
Feb 3
LHR7:40 amLondon Heathrow
18h 30m
2 stops
PDX6:10 pmPortland
$610
Lufthansa
Feb 17
PDX9:50 amPortland
16h 20m
2 stops
LHR10:10 amLondon Heathrow
Feb 24
LHR8:30 amLondon Heathrow
20h 45m
2 stops
PDX9:15 pmPortland
$615

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 January 21, 2026.
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

Tue 3/31

3:30 pm-11:55 am

1 stop12h 25m

London Heathrow

Tue 4/7

9:25 pm-6:00 pm

1 stop28h 35m

$595

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 2/10

6:00 am-6:55 am

1 stop16h 55m

London Heathrow

Wed 2/25

1:45 pm-3:55 pm

Nonstop10h 10m

$596

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 3/8

3:15 pm-11:50 am

1 stop13h 35m

London Heathrow

Fri 3/20

1:25 pm-9:15 am

2 stops26h 50m

$597

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 2/8

6:00 am-6:55 am

1 stop16h 55m

London Heathrow

Fri 3/6

1:45 pm-3:55 pm

Nonstop10h 10m

$598

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 2/3

12:35 pm-11:40 am

1 stop15h 05m

London Heathrow

Fri 2/13

3:45 pm-12:17 am

1 stop16h 32m

$599

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 3/31

3:30 pm-11:55 am

1 stop12h 25m

London Heathrow

Sat 4/11

9:25 pm-6:00 pm

1 stop28h 35m

$600

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 2/9

9:50 am-10:10 am

2 stops16h 20m

London Heathrow

Mon 2/16

7:30 pm-6:55 pm

2 stops31h 25m

$601

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 3/31

7:05 pm-8:35 am

2 stops29h 30m

London Heathrow

Tue 4/7

8:45 am-10:29 pm

2 stops21h 44m

$602

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 2/9

5:45 pm-11:20 am

Nonstop9h 35m

London Heathrow

Tue 3/3

3:45 pm-12:17 am

1 stop16h 32m

$603

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 2/22

5:45 pm-11:20 am

Nonstop9h 35m

London Heathrow

Wed 3/4

2:10 pm-12:17 am

1 stop18h 07m

$604

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 April is, on average, the cheapest month to fly to London Heathrow Airport from Portland, with most prices found around $675. If you’re not able to fly to London Heathrow Airport in April, then October is your next best option. Flight prices from Portland to London Heathrow Airport during October average around $680.

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 $843. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $992.

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 $722. 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 $918.

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 $835 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 $744 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.

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

As of January 2026, prices for Portland to London Heathrow Airport flights are approximately 40% more expensive 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

$366

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 $366. The best round-trip flight deal from Portland to London Heathrow Airport found on momondo in the last 72 hours is $654.
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 30m 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
7.1
602 reviews
Search Icelandair flights
DeltaPriceFrom $552Free CancellationRating
7.9
8,085 reviews
Search Delta flights
Virgin AtlanticPriceFrom $558Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
KLMPriceFrom $561Free CancellationRating
7.7
1,442 reviews
Search KLM flights
IberiaPriceFrom $577Free CancellationRating
7.0
3,094 reviews
Search Iberia flights
British AirwaysPriceFrom $583Free CancellationRating
6.7
7,691 reviews
Search British Airways flights
Alaska AirlinesPriceFrom $600Free CancellationRating
8.0
11,768 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $619Free CancellationRating
7.4
9,190 reviews
Search United Airlines flights
American AirlinesPriceFrom $628Free CancellationRating
7.2
11,172 reviews
Search American Airlines flights
FinnairPriceFrom $645Free CancellationRating
7.6
1,353 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 $1,498, with the best Alaska Airlines deals starting from $600 round-trip. 11,768 users have rated Alaska Airlines on momondo, with an average score of 8.0/10.

  • Finnair Flights From Portland to London Heathrow Airport

    Across 1,353 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 $645 to $978. 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
Luton
Milton Keynes
Dover
Slough
Guildford
Wembley
Crawley
Dartford
Hayes
Stratford-upon-Avon
Brentwood
Watford
Cobham
Folkestone
Romford
Stansted
Harrow
Croydon

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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