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Cheap flights from Portland to London from £262

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 3/11. 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 return flights

United Airlines Logo
13:45 - 11:35PDX-LHR
37h 50m2 stops
United Airlines Logo
14:10 - 14:46LHR-PDX
32h 36m1 stop
£402United Airlines
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Tue, 23 Sep - Tue, 14 Oct
British Airways Logo
19:25 - 13:00PDX-LHR
9h 35mdirect
British Airways Logo
13:45 - 15:55LHR-PDX
10h 10mdirect
£403British Airways
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Wed, 22 Oct - Wed, 5 Nov
British Airways Logo
13:16 - 10:25PDX-LHR
14h 09m1 stop
British Airways Logo
13:45 - 15:55LHR-PDX
10h 10mdirect
£405British Airways
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Mon, 27 Oct - Wed, 5 Nov
Delta Logo
19:10 - 20:00PDX-LHR
16h 50m2 stops
Delta Logo
06:30 - 11:05LHR-PDX
12h 35m1 stop
£405Delta
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Tue, 23 Sep - Fri, 24 Oct
Logo
05:30 - 06:30PDX-LHR
17h 00m2 stops
Logo
14:10 - 09:20LHR-PDX
27h 10m1 stop
£406
Find Deal
Tue, 30 Sep - Wed, 15 Oct
Air Canada Logo
05:45 - 11:50PDX-LHR
22h 05m2 stops
Air Canada Logo
13:25 - 00:19LHR-PDX
17h 54m2 stops
£408Air Canada
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Sun, 1 Mar - Thu, 19 Mar
Delta Logo
00:40 - 07:05PDX-LHR
22h 25m1 stop
Delta Logo
06:20 - 18:27LHR-PDX
20h 07m2 stops
£408Delta
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Mon, 3 Nov - Fri, 21 Nov
Iberia Logo
19:25 - 13:00PDX-LHR
9h 35mdirect
Iberia Logo
10:05 - 23:08LHR-PDX
20h 03m1 stop
£410Iberia
Find Deal
Mon, 20 Oct - Thu, 30 Oct
Air Canada Logo
15:15 - 11:50PDX-LHR
13h 35m1 stop
Air Canada Logo
15:00 - 09:15LHR-PDX
26h 15m2 stops
£417Air Canada
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Sun, 26 Oct - Sun, 2 Nov
Logo
15:15 - 07:10PDX-LHR
31h 55m2 stops
Logo
06:35 - 18:30LHR-PDX
19h 55m2 stops
£429
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Thu, 6 Nov - Tue, 18 Nov

United Airlines flights from Portland to London Heathrow Airport

Our best United Airlines deals on Portland to London Heathrow Airport flight tickets
United Airlines
23 Sept
PDX13:45Portland
37h 50m
2 stops
LHR11:35London Heathrow
14 Oct
LHR14:10London Heathrow
32h 36m
1 stop
PDX14:46Portland
£402
Find similar
United Airlines
1 Oct
PDX11:05Portland
19h 05m
1 stop
LHR14:10London Heathrow
8 Oct
LHR14:10London Heathrow
16h 51m
1 stop
PDX23:01Portland
£407
Find similar
United Airlines
12 Nov
PDX15:15Portland
12h 35m
1 stop
LHR11:50London Heathrow
17 Nov
LHR11:05London Heathrow
41h 24m
2 stops
PDX20:29Portland
£413
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
22 Oct
PDX19:25Portland
9h 35m
LHR13:00London Heathrow
5 Nov
LHR13:45London Heathrow
10h 10m
PDX15:55Portland
£403
Find similar
British Airways
27 Oct
PDX13:16Portland
14h 09m
1 stop
LHR10:25London Heathrow
5 Nov
LHR13:45London Heathrow
10h 10m
PDX15:55Portland
£405
Find similar
British Airways
14 Oct
PDX19:25Portland
9h 35m
LHR13:00London Heathrow
4 Nov
LHR10:05London Heathrow
17h 09m
1 stop
PDX19:14Portland
£409
Find similar

momondo Fare Finder

 
Customise 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 279,928 searches. Data last updated 12 September 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

Tue 23/9

13:45-11:35

2 stops37h 50m

London Heathrow

Tue 14/10

14:10-14:46

1 stop32h 36m

£402

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 22/10

19:25-13:00

Nonstop9h 35m

London Heathrow

Wed 5/11

13:45-15:55

Nonstop10h 10m

£403

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 27/10

13:16-10:25

1 stop14h 09m

London Heathrow

Wed 5/11

13:45-15:55

Nonstop10h 10m

£405

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 23/9

19:10-20:00

2 stops16h 50m

London Heathrow

Fri 24/10

06:30-11:05

1 stop12h 35m

£405

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 30/9

05:30-06:30

2 stops17h 00m

London Heathrow

Wed 15/10

14:10-09:20

1 stop27h 10m

£406

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 1/3

05:45-11:50

2 stops22h 05m

London Heathrow

Thu 19/3

13:25-00:19

2 stops17h 54m

£408

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 3/11

00:40-07:05

1 stop22h 25m

London Heathrow

Fri 21/11

06:20-18:27

2 stops20h 07m

£408

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 20/10

19:25-13:00

Nonstop9h 35m

London Heathrow

Thu 30/10

10:05-23:08

1 stop20h 03m

£410

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 26/10

15:15-11:50

1 stop13h 35m

London Heathrow

Sun 2/11

15:00-09:15

2 stops26h 15m

£417

PortlandLondon

PDX - LHR

PDXLHR

Portland

Thu 6/11

15:15-07:10

2 stops31h 55m

London Heathrow

Tue 18/11

06:35-18:30

2 stops19h 55m

£429

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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?

In general, October is the cheapest month to fly from Portland to London Heathrow Airport. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around £503. The month of April is another great option to travel to London Heathrow Airport, with average flight prices from Portland averaging around £509.

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

On average, the least expensive day to fly to London Heathrow Airport from Portland is on a Friday. momondo users have found tickets for Friday departures for as low as £454. However, this price may fluctuate depending on the airline, the season, and holidays. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to London Heathrow Airport on Saturday is £656.

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 evening. momondo users have found flights departing from Portland to London Heathrow Airport in the evening for as low as £515. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying at midday when prices are £698 on average. Flights to London Heathrow Airport from Portland at midday are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 £619 when searching weeks before you fly. 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 £564 on momondo.

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

There are 3 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 return 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

£3,143

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 £3,143. The best return flight deal from Portland to London Heathrow Airport found on momondo in the last 72 hours is £437.
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. 9h 35m is a normal flight duration for this route.

  • 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 refresh daily.

  • 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 for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London Heathrow Airport.

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

    The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking 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
British AirwaysPriceFrom £380Free CancellationRating
6.6
7,361 reviews
Search British Airways flights
IberiaPriceFrom £450Free CancellationRating
7.0
2,929 reviews
Search Iberia flights

  • Iberia Flights From Portland to London Heathrow Airport

    Iberia operates around 6 flights from Portland to London Heathrow Airport every week. The average price of these flights found in the last 72 hours has been £733, but momondo users have found Iberia deals from Portland to London Heathrow Airport from as low as £609 round-trip. Iberia has been scored 7.0/10 in 2,929 reviews.

  • British Airways Flights From Portland to London Heathrow Airport

    British Airways is also a popular choice for this route. British Airways flight deals for Portland to London Heathrow Airport start from as low as £514 round-trip, depending on your selected dates, with average British Airways deals seen on momondo around £723. British Airways operates 6 flights to London Heathrow Airport from Portland in an average week. Users have rated it 6.6/10 across 7,361 reviews.

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Eastbourne
Luton
Milton Keynes
Maidstone
Northampton
Gatwick
Slough
Swindon
Canterbury
Stratford-upon-Avon
Southend-on-Sea
Ipswich
Ilford
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Poole
Colchester
Worthing
Salisbury
Dover

Why use momondo?

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

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Portland to London . Millions of users trust and use momondo every year so you are in good hands.

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 all potential Portland to London flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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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