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Cheap flights from Portland to London from $345

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 11/3. 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
1:45 pm - 11:35 amPDX-LHR
37h 50m2 stops
United Airlines Logo
2:10 pm - 2:46 pmLHR-PDX
32h 36m1 stop
$545United Airlines
Find Deal
mar., sep. 23 - mar., oct. 14
British Airways Logo
7:25 pm - 1:00 pmPDX-LHR
9h 35mnonstop
British Airways Logo
1:45 pm - 3:55 pmLHR-PDX
10h 10mnonstop
$546British Airways
Find Deal
mié., oct. 22 - mié., nov. 5
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
lun., oct. 6 - mié., oct. 22
Delta Logo
7:10 pm - 8:00 pmPDX-LHR
16h 50m2 stops
Delta Logo
6:30 am - 11:20 amLHR-PDX
12h 50m1 stop
$549Delta
Find Deal
mar., sep. 23 - mié., oct. 22
Air Canada Logo
6:15 am - 9:35 amPDX-LHR
19h 20m2 stops
Air Canada Logo
6:00 pm - 2:45 pmLHR-PDX
27h 45m2 stops
$552Air Canada
Find Deal
mié., oct. 1 - mar., oct. 28
Delta Logo
12:40 am - 7:05 amPDX-LHR
22h 25m1 stop
Delta Logo
6:20 am - 6:27 pmLHR-PDX
20h 07m2 stops
$553Delta
Find Deal
lun., nov. 3 - vie., nov. 21
Finnair Logo
7:25 pm - 1:00 pmPDX-LHR
9h 35mnonstop
Finnair Logo
10:05 am - 7:46 pmLHR-PDX
16h 41m1 stop
$556Finnair
Find Deal
mié., oct. 22 - mié., oct. 29
Icelandair Logo
2:45 pm - 10:50 amPDX-LHR
12h 05m1 stop
Icelandair Logo
12:15 pm - 5:00 pmLHR-PDX
12h 45m1 stop
$562Icelandair
Find Deal
sáb., nov. 29 - vie., dic. 5
Air Canada Logo
3:15 pm - 11:50 amPDX-LHR
13h 35m1 stop
Air Canada Logo
3:00 pm - 9:15 amLHR-PDX
26h 15m2 stops
$565Air Canada
Find Deal
dom., oct. 26 - dom., nov. 2
Icelandair Logo
3:20 pm - 11:55 amPDX-LHR
12h 35m1 stop
Icelandair Logo
9:25 pm - 5:55 pmLHR-PDX
28h 30m1 stop
$570Icelandair
Find Deal
mié., sep. 24 - lun., oct. 6

United Airlines flights from Portland to London Heathrow Airport

Our best United Airlines deals on Portland to London Heathrow Airport flight tickets
United Airlines
Sep 23
PDX1:45 pmPortland
37h 50m
2 stops
LHR11:35 amLondon Heathrow
Oct 14
LHR2:10 pmLondon Heathrow
32h 36m
1 stop
PDX2:46 pmPortland
$545
Find similar
United Airlines
Sep 22
PDX5:30 amPortland
17h 55m
1 stop
LHR7:25 amLondon Heathrow
Oct 9
LHR2:10 pmLondon Heathrow
16h 51m
1 stop
PDX11:01 pmPortland
$550
Find similar
United Airlines
Oct 1
PDX11:05 amPortland
19h 05m
1 stop
LHR2:10 pmLondon Heathrow
Oct 8
LHR2:10 pmLondon Heathrow
16h 51m
1 stop
PDX11:01 pmPortland
$551
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
Oct 22
PDX7:25 pmPortland
9h 35m
LHR1:00 pmLondon Heathrow
Nov 5
LHR1:45 pmLondon Heathrow
10h 10m
PDX3:55 pmPortland
$546
Find similar
British Airways
Oct 6
PDX7:25 pmPortland
9h 35m
LHR1:00 pmLondon Heathrow
Oct 22
LHR3:40 pmLondon Heathrow
9h 55m
PDX5:35 pmPortland
$547
Find similar
British Airways
Oct 15
PDX1:16 pmPortland
13h 49m
1 stop
LHR11:05 amLondon Heathrow
Oct 22
LHR3:40 pmLondon Heathrow
9h 55m
PDX5:35 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 septiembre 11, 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

mar. 9/23

1:45 pm-11:35 am

2 stops37h 50m

London Heathrow

mar. 10/14

2:10 pm-2:46 pm

1 stop32h 36m

$545

PortlandLondon

PDX - LHR

PDXLHR

Portland

mié. 10/22

7:25 pm-1:00 pm

Nonstop9h 35m

London Heathrow

mié. 11/5

1:45 pm-3:55 pm

Nonstop10h 10m

$546

PortlandLondon

PDX - LHR

PDXLHR

Portland

lun. 10/6

7:25 pm-1:00 pm

Nonstop9h 35m

London Heathrow

mié. 10/22

3:40 pm-5:35 pm

Nonstop9h 55m

$547

PortlandLondon

PDX - LHR

PDXLHR

Portland

mar. 9/23

7:10 pm-8:00 pm

2 stops16h 50m

London Heathrow

mié. 10/22

6:30 am-11:20 am

1 stop12h 50m

$549

PortlandLondon

PDX - LHR

PDXLHR

Portland

mié. 10/1

6:15 am-9:35 am

2 stops19h 20m

London Heathrow

mar. 10/28

6:00 pm-2:45 pm

2 stops27h 45m

$552

PortlandLondon

PDX - LHR

PDXLHR

Portland

lun. 11/3

12:40 am-7:05 am

1 stop22h 25m

London Heathrow

vie. 11/21

6:20 am-6:27 pm

2 stops20h 07m

$553

PortlandLondon

PDX - LHR

PDXLHR

Portland

mié. 10/22

7:25 pm-1:00 pm

Nonstop9h 35m

London Heathrow

mié. 10/29

10:05 am-7:46 pm

1 stop16h 41m

$556

PortlandLondon

PDX - LHR

PDXLHR

Portland

sáb. 11/29

2:45 pm-10:50 am

1 stop12h 05m

London Heathrow

vie. 12/5

12:15 pm-5:00 pm

1 stop12h 45m

$562

PortlandLondon

PDX - LHR

PDXLHR

Portland

dom. 10/26

3:15 pm-11:50 am

1 stop13h 35m

London Heathrow

dom. 11/2

3:00 pm-9:15 am

2 stops26h 15m

$565

PortlandLondon

PDX - LHR

PDXLHR

Portland

mié. 9/24

3:20 pm-11:55 am

1 stop12h 35m

London Heathrow

lun. 10/6

9:25 pm-5:55 pm

1 stop28h 30m

$570

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 $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 $857. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,066.

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 $811. 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 $940.

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 $764 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 20% 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

$470

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 $470. The best round-trip flight deal from Portland to London Heathrow Airport found on momondo in the last 72 hours is $662.
The fastest flight from Portland to London Heathrow Airport takes 9h 35m
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 $489Free CancellationRating
7.0
546 reviews
Search Icelandair flights
DeltaPriceFrom $554Free CancellationRating
7.9
7,960 reviews
Search Delta flights
Virgin AtlanticPriceFrom $567Free CancellationRating
7.4
664 reviews
Search Virgin Atlantic flights
IberiaPriceFrom $578Free CancellationRating
7.0
2,929 reviews
Search Iberia flights
British AirwaysPriceFrom $597Free CancellationRating
6.6
7,361 reviews
Search British Airways flights
United AirlinesPriceFrom $623Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights
American AirlinesPriceFrom $627Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
FinnairPriceFrom $645Free CancellationRating
7.6
1,323 reviews
Search Finnair flights
LufthansaPriceFrom $709Free CancellationRating
6.8
7,409 reviews
Search Lufthansa flights
Air CanadaPriceFrom $713Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights

  • Alaska Airlines Flights From Portland to London Heathrow Airport

    Across 6 Alaska Airlines flights from Portland to London Heathrow Airport this week, the average price was $1,442, 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 1,323 Finnair reviews on momondo, the average score is 7.6/10. Finnair flies from Portland to London Heathrow Airport about 6 times each week, with ticket deals ranging from $645 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
Gatwick
Hounslow
Dover
Luton
Slough
Milton Keynes
Hayes
Guildford
Dartford
Crawley
Stansted
Chelmsford
Salisbury
Brentwood
Ilford
Folkestone
Colchester
Swindon
Stratford-upon-Avon
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.

An easier way to manage your London Heathrow Airport trip

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