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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 1/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
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.
United Airlines Logo
10:47 am - 7:55 am
PDX
-
LHR
13h 08m1 stop
United Airlines Logo
2:30 pm - 9:15 am
LHR
-
PDX
26h 45m1 stop
$594United Airlines
Wed, Jan 7 - Thu, Jan 15
Multiple Airlines Logo
7:00 pm - 11:50 am
PDX
-
LHR
32h 50m1 stop
Multiple Airlines Logo
7:40 am - 6:30 pm
LHR
-
PDX
18h 50m2 stops
$596Multiple Airlines
Tue, Jan 13 - Sun, Jan 18
Lufthansa Logo
9:50 am - 11:50 am
PDX
-
LHR
18h 00m1 stop
Lufthansa Logo
7:40 am - 6:30 pm
LHR
-
PDX
18h 50m2 stops
$597Lufthansa
Fri, Jan 30 - Tue, Feb 3
Lufthansa Logo
12:54 pm - 9:40 am
PDX
-
LHR
12h 46m1 stop
Lufthansa Logo
6:30 am - 10:32 pm
LHR
-
PDX
24h 02m2 stops
$598Lufthansa
Tue, Dec 30 - Sun, Feb 8
Scandinavian Airlines Logo
1:02 pm - 5:40 pm
PDX
-
LHR
20h 38m2 stops
Scandinavian Airlines Logo
10:20 am - 10:23 pm
LHR
-
PDX
19h 03m2 stops
$599Scandinavian Airlines
Mon, Mar 2 - Sun, Mar 8
Finnair Logo
5:45 pm - 11:20 am
PDX
-
LHR
9h 35mnonstop
Finnair Logo
8:20 am - 6:51 pm
LHR
-
PDX
18h 31m1 stop
$600Finnair
Wed, Jan 14 - Wed, Jan 28
Lufthansa Logo
9:50 am - 11:50 am
PDX
-
LHR
18h 00m1 stop
Lufthansa Logo
10:30 am - 12:39 am
LHR
-
PDX
22h 09m2 stops
$601Lufthansa
Mon, Jan 12 - Sat, Jan 24
United Airlines Logo
8:30 am - 10:25 am
PDX
-
LHR
17h 55m2 stops
United Airlines Logo
3:20 pm - 12:37 am
LHR
-
PDX
17h 17m2 stops
$602United Airlines
Tue, Dec 9 - Tue, Dec 16
Scandinavian Airlines Logo
1:02 pm - 9:35 pm
PDX
-
LHR
24h 33m3 stops
Scandinavian Airlines Logo
10:20 am - 10:23 pm
LHR
-
PDX
19h 03m2 stops
$603Scandinavian Airlines
Mon, Mar 2 - Wed, Mar 18
Lufthansa Logo
7:45 am - 12:00 pm
PDX
-
LHR
20h 15m1 stop
Lufthansa Logo
8:30 am - 10:56 pm
LHR
-
PDX
22h 26m2 stops
$605Lufthansa
Sun, Feb 8 - Sat, Feb 21

United Airlines flights from Portland to London Heathrow Airport

Our best United Airlines deals on Portland to London Heathrow Airport flight tickets
United Airlines
Jan 7
PDX10:47 amPortland
13h 08m
1 stop
LHR7:55 amLondon Heathrow
Jan 15
LHR2:30 pmLondon Heathrow
26h 45m
1 stop
PDX9:15 amPortland
$594
Find similar
United Airlines
Dec 9
PDX8:30 amPortland
17h 55m
2 stops
LHR10:25 amLondon Heathrow
Dec 16
LHR3:20 pmLondon Heathrow
17h 17m
2 stops
PDX12:37 amPortland
$602
Find similar
United Airlines
Dec 30
PDX2:45 pmPortland
34h 55m
1 stop
LHR9:40 amLondon Heathrow
Feb 8
LHR2:30 pmLondon Heathrow
26h 45m
1 stop
PDX9:15 amPortland
$625
Find similar

British Airways flights from Portland to London Heathrow Airport

Our best British Airways deals on Portland to London Heathrow Airport flight tickets
British Airways
Mar 16
PDX11:46 amPortland
13h 49m
1 stop
LHR8:35 amLondon Heathrow
Apr 23
LHR3:40 pmLondon Heathrow
10h 00m
PDX5:40 pmPortland
$597
Find similar
British Airways
Mar 29
PDX7:30 pmPortland
9h 30m
LHR1:00 pmLondon Heathrow
Apr 23
LHR3:40 pmLondon Heathrow
10h 00m
PDX5:40 pmPortland
$606
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 December 4, 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 1/7

10:47 am-7:55 am

1 stop13h 08m

London Heathrow

Thu 1/15

2:30 pm-9:15 am

1 stop26h 45m

$594

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 1/13

7:00 pm-11:50 am

1 stop32h 50m

London Heathrow

Sun 1/18

7:40 am-6:30 pm

2 stops18h 50m

$596

PortlandLondon

PDX - LHR

PDXLHR

Portland

Fri 1/30

9:50 am-11:50 am

1 stop18h 00m

London Heathrow

Tue 2/3

7:40 am-6:30 pm

2 stops18h 50m

$597

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 12/30

12:54 pm-9:40 am

1 stop12h 46m

London Heathrow

Sun 2/8

6:30 am-10:32 pm

2 stops24h 02m

$598

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 3/2

1:02 pm-5:40 pm

2 stops20h 38m

London Heathrow

Sun 3/8

10:20 am-10:23 pm

2 stops19h 03m

$599

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 1/14

5:45 pm-11:20 am

Nonstop9h 35m

London Heathrow

Wed 1/28

8:20 am-6:51 pm

1 stop18h 31m

$600

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 1/12

9:50 am-11:50 am

1 stop18h 00m

London Heathrow

Sat 1/24

10:30 am-12:39 am

2 stops22h 09m

$601

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 12/9

8:30 am-10:25 am

2 stops17h 55m

London Heathrow

Tue 12/16

3:20 pm-12:37 am

2 stops17h 17m

$602

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 3/2

1:02 pm-9:35 pm

3 stops24h 33m

London Heathrow

Wed 3/18

10:20 am-10:23 pm

2 stops19h 03m

$603

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 2/8

7:45 am-12:00 pm

1 stop20h 15m

London Heathrow

Sat 2/21

8:30 am-10:56 pm

2 stops22h 26m

$605

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 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 $681. 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 $850. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,019.

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 $765. 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 $934.

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 $765 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 20% 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 December 2025, prices for Portland to London Heathrow Airport flights are approximately 27% 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

$427

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 $427. The best round-trip flight deal from Portland to London Heathrow Airport found on momondo in the last 72 hours is $695.
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 $491Free CancellationRating
7.0
584 reviews
Search Icelandair flights
DeltaPriceFrom $552Free CancellationRating
7.9
8,011 reviews
Search Delta flights
Virgin AtlanticPriceFrom $558Free CancellationRating
7.5
675 reviews
Search Virgin Atlantic flights
KLMPriceFrom $561Free CancellationRating
7.7
1,430 reviews
Search KLM flights
IberiaPriceFrom $577Free CancellationRating
7.0
3,040 reviews
Search Iberia flights
British AirwaysPriceFrom $592Free CancellationRating
6.7
7,562 reviews
Search British Airways flights
Alaska AirlinesPriceFrom $600Free CancellationRating
8.0
11,402 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $619Free CancellationRating
7.4
9,066 reviews
Search United Airlines flights
American AirlinesPriceFrom $632Free CancellationRating
7.2
11,047 reviews
Search American Airlines flights
FinnairPriceFrom $641Free CancellationRating
7.6
1,334 reviews
Search Finnair flights

  • American Airlines Flights From Portland to London Heathrow Airport

    Across 2 American Airlines flights from Portland to London Heathrow Airport this week, the average price was $893, with the best American Airlines deals starting from $632 round-trip. 11,047 users have rated American Airlines on momondo, with an average score of 7.2/10.

  • Aer Lingus Flights From Portland to London Heathrow Airport

    Across 1,384 Aer Lingus reviews on momondo, the average score is 7.2/10. Aer Lingus flies from Portland to London Heathrow Airport about 3 times each week, with ticket deals ranging from $768 to $794. 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
Dover
Luton
Slough
Guildford
Hayes
Dartford
Stratford-upon-Avon
Crawley
Brentwood
Salisbury
Wembley
Romford
Watford
Ilford
Cobham
Folkestone
Uxbridge

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

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.
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