Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Portland to London from $320

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 10/5. 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

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

Find the cheapest flights from Portland to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
Scandinavian Airlines Logo
11:03 pm - 9:35 am
PDX
-
LHR
26h 32m
2 stops
Scandinavian Airlines Logo
7:05 am - 9:00 pm
LHR
-
PDX
21h 55m
2 stops
$879Scandinavian Airlines
Thu, May 7 - Thu, May 14
Multiple Airlines Logo
7:05 pm - 8:55 am
PDX
-
LHR
29h 50m
3 stops
Multiple Airlines Logo
9:25 pm - 9:30 am
LHR
-
PDX
44h 05m
3 stops
$889Multiple Airlines
Fri, Jun 5 - Mon, Jun 8
Multiple Airlines Logo
3:30 pm - 6:30 pm
PDX
-
LHR
19h 00m
2 stops
Multiple Airlines Logo
5:00 pm - 5:55 pm
LHR
-
PDX
32h 55m
2 stops
$894Multiple Airlines
Tue, May 26 - Tue, Jun 2
Multiple Airlines Logo
3:30 pm - 9:35 am
PDX
-
LHR
34h 05m
2 stops
Multiple Airlines Logo
5:30 pm - 11:45 am
LHR
-
PDX
26h 15m
2 stops
$897Multiple Airlines
Thu, Jun 4 - Fri, Jun 12
Multiple Airlines Logo
3:30 pm - 8:20 pm
PDX
-
LHR
20h 50m
2 stops
Multiple Airlines Logo
8:50 am - 11:45 am
LHR
-
PDX
34h 55m
2 stops
$904Multiple Airlines
Tue, Jul 21 - Wed, Jul 29
Multiple Airlines Logo
7:05 pm - 8:55 am
PDX
-
LHR
29h 50m
3 stops
Multiple Airlines Logo
10:20 am - 11:45 am
LHR
-
PDX
33h 25m
2 stops
$905Multiple Airlines
Fri, Jun 5 - Fri, Jun 19
Scandinavian Airlines Logo
11:03 pm - 9:35 am
PDX
-
LHR
26h 32m
2 stops
Scandinavian Airlines Logo
7:05 am - 9:00 pm
LHR
-
PDX
21h 55m
2 stops
$909Scandinavian Airlines
Thu, May 7 - Thu, May 14
Virgin Atlantic Logo
2:08 pm - 1:15 pm
PDX
-
LHR
15h 07m
1 stop
Virgin Atlantic Logo
8:55 pm - 11:10 am
LHR
-
PDX
22h 15m
1 stop
$928Virgin Atlantic
Wed, Jul 29 - Tue, Aug 11
Multiple Airlines Logo
7:05 pm - 8:55 am
PDX
-
LHR
29h 50m
3 stops
Multiple Airlines Logo
2:45 pm - 11:45 am
LHR
-
PDX
29h 00m
3 stops
$935Multiple Airlines
Fri, Jun 5 - Fri, Jun 19
Multiple Airlines Logo
7:05 pm - 8:55 am
PDX
-
LHR
29h 50m
3 stops
Multiple Airlines Logo
6:40 am - 5:55 pm
LHR
-
PDX
19h 15m
2 stops
$936Multiple Airlines
Fri, Jun 5 - Fri, Jun 19

British Airways flights from Portland to London Heathrow Airport

Our best British Airways deals on Portland to London Heathrow Airport flight tickets
British Airways
Jul 31
PDX1:34 pmPortland
15h 16m
1 stop
LHR12:50 pmLondon Heathrow
Aug 13
LHR3:40 pmLondon Heathrow
10h 00m
PDX5:40 pmPortland
$1,010
British Airways
May 10
PDX7:30 pmPortland
9h 30m
LHR1:00 pmLondon Heathrow
May 22
LHR3:40 pmLondon Heathrow
10h 00m
PDX5:40 pmPortland
$1,044
British Airways
May 7
PDX7:30 pmPortland
9h 30m
LHR1:00 pmLondon Heathrow
May 27
LHR3:40 pmLondon Heathrow
10h 00m
PDX5:40 pmPortland
$1,046

Scandinavian Airlines flights from Portland to London Heathrow Airport

Our best Scandinavian Airlines deals on Portland to London Heathrow Airport flight tickets
Scandinavian Airlines
May 7
PDX11:03 pmPortland
26h 32m
2 stops
LHR9:35 amLondon Heathrow
May 14
LHR7:05 amLondon Heathrow
21h 55m
2 stops
PDX9:00 pmPortland
$879
Scandinavian Airlines
May 7
PDX11:03 pmPortland
26h 32m
2 stops
LHR9:35 amLondon Heathrow
May 14
LHR7:05 amLondon Heathrow
21h 55m
2 stops
PDX9:00 pmPortland
$909
Scandinavian Airlines
May 26
PDX12:20 pmPortland
19h 40m
2 stops
LHR4:00 pmLondon Heathrow
Jun 10
LHR5:00 pmLondon Heathrow
37h 22m
2 stops
PDX10:22 pmPortland
$980

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 May 3, 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

Cheapest round-trip

PortlandLondon

PDX - LHR

PDXLHR

Portland

Thu 5/7

11:03 pm-9:35 am

2 stops26h 32m

London Heathrow

Thu 5/14

7:05 am-9:00 pm

2 stops21h 55m

$879

PortlandLondon

PDX - LHR

PDXLHR

Portland

Fri 6/5

7:05 pm-8:55 am

3 stops29h 50m

London Heathrow

Mon 6/8

9:25 pm-9:30 am

3 stops44h 05m

$889

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 5/26

3:30 pm-6:30 pm

2 stops19h 00m

London Heathrow

Tue 6/2

5:00 pm-5:55 pm

2 stops32h 55m

$894

PortlandLondon

PDX - LHR

PDXLHR

Portland

Thu 6/4

3:30 pm-9:35 am

2 stops34h 05m

London Heathrow

Fri 6/12

5:30 pm-11:45 am

2 stops26h 15m

$897

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 7/21

3:30 pm-8:20 pm

2 stops20h 50m

London Heathrow

Wed 7/29

8:50 am-11:45 am

2 stops34h 55m

$904

PortlandLondon

PDX - LHR

PDXLHR

Portland

Fri 6/5

7:05 pm-8:55 am

3 stops29h 50m

London Heathrow

Fri 6/19

10:20 am-11:45 am

2 stops33h 25m

$905

PortlandLondon

PDX - LHR

PDXLHR

Portland

Thu 5/7

11:03 pm-9:35 am

2 stops26h 32m

London Heathrow

Thu 5/14

7:05 am-9:00 pm

2 stops21h 55m

$909
Quickest round-trip

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 7/29

2:08 pm-1:15 pm

1 stop15h 07m

London Heathrow

Tue 8/11

8:55 pm-11:10 am

1 stop22h 15m

$928

PortlandLondon

PDX - LHR

PDXLHR

Portland

Fri 6/5

7:05 pm-8:55 am

3 stops29h 50m

London Heathrow

Fri 6/19

2:45 pm-11:45 am

3 stops29h 00m

$935

PortlandLondon

PDX - LHR

PDXLHR

Portland

Fri 6/5

7:05 pm-8:55 am

3 stops29h 50m

London Heathrow

Fri 6/19

6:40 am-5:55 pm

2 stops19h 15m

$936

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 January is, on average, the cheapest month to fly to London Heathrow Airport from Portland, with most prices found around $687. If you’re not able to fly to London Heathrow Airport in January, then October is your next best option. Flight prices from Portland to London Heathrow Airport during October average around $689.

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

Our data shows that Monday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $848. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $1,015.

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 $735. 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 from Portland 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 $867 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 $754 on momondo.

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

As of May 2026, prices for Portland to London Heathrow Airport flights are approximately 8% 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

$434

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 $434. The best round-trip flight deal from Portland to London Heathrow Airport found on momondo in the last 72 hours is $1,009.
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

Frequently asked questions about flying from Portland to London Heathrow Airport

  • 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
7.0
649 reviews
Search Icelandair flights
DeltaPriceFrom $552Free CancellationRating
7.9
8,460 reviews
Search Delta flights
Virgin AtlanticPriceFrom $558Free CancellationRating
7.4
688 reviews
Search Virgin Atlantic flights
KLMPriceFrom $561Free CancellationRating
7.8
1,509 reviews
Search KLM flights
British AirwaysPriceFrom $576Free CancellationRating
6.7
7,943 reviews
Search British Airways flights
IberiaPriceFrom $589Free CancellationRating
7.0
3,209 reviews
Search Iberia flights
Alaska AirlinesPriceFrom $600Free CancellationRating
7.9
12,321 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $607Free CancellationRating
7.4
9,683 reviews
Search United Airlines flights
Air CanadaPriceFrom $630Free CancellationRating
7.1
10,993 reviews
Search Air Canada flights
FinnairPriceFrom $664Free CancellationRating
7.6
1,392 reviews
Search Finnair 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 $1,101, with the best Alaska Airlines deals starting from $600 round-trip. 12,321 users have rated Alaska Airlines on momondo, with an average score of 7.9/10.

  • Finnair Flights From Portland to London Heathrow Airport

    Across 1,392 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 $664 to $977. 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
Hounslow
Gatwick
Milton Keynes
Dover
Luton
Hayes
Stratford-upon-Avon
Crawley
Slough
Wembley
Stansted
Watford
Croydon
Uxbridge
Brentwood
Dartford
Cobham
Folkestone
Romford
Harrow

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.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 6/2
Tue 6/9
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to London