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Cheap flights from Portland to London from $261

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 1/21. 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.
Delta Logo
9:55 am - 10:30 am
PDX
-
LHR
17h 35m2 stops
Delta Logo
6:30 am - 11:10 am
LHR
-
PDX
12h 40m1 stop
$641Delta
Mon, Mar 16 - Thu, Apr 23
Multiple Airlines Logo
9:50 am - 11:50 am
PDX
-
LHR
18h 00m2 stops
Multiple Airlines Logo
8:45 am - 10:29 pm
LHR
-
PDX
21h 44m2 stops
$642Multiple Airlines
Tue, Mar 31 - Tue, Apr 7
British Airways Logo
7:30 pm - 1:00 pm
PDX
-
LHR
9h 30mnonstop
British Airways Logo
3:40 pm - 5:40 pm
LHR
-
PDX
10h 00mnonstop
$646British Airways
Tue, Mar 31 - Tue, Apr 7
American Airlines Logo
6:00 am - 8:15 am
PDX
-
LHR
18h 15m1 stop
American Airlines Logo
1:45 pm - 3:55 pm
LHR
-
PDX
10h 10mnonstop
$648American Airlines
Mon, Feb 9 - Wed, Feb 25
Icelandair Logo
3:30 pm - 2:40 pm
PDX
-
LGW
15h 10m1 stop
Icelandair Logo
3:40 pm - 6:00 pm
LGW
-
PDX
34h 20m1 stop
$653Icelandair
Thu, Apr 30 - Tue, May 12
Virgin Atlantic Logo
1:27 pm - 5:20 pm
PDX
-
LCY
19h 53m2 stops
Virgin Atlantic Logo
8:15 pm - 11:10 am
LCY
-
PDX
22h 55m1 stop
$656Virgin Atlantic
Tue, Mar 3 - Tue, Mar 31
Virgin Atlantic Logo
1:25 pm - 4:35 pm
PDX
-
LCY
19h 10m1 stop
Virgin Atlantic Logo
7:45 am - 7:13 pm
LCY
-
PDX
19h 28m2 stops
$662Virgin Atlantic
Wed, Jan 28 - Wed, Feb 4
British Airways Logo
7:38 am - 8:50 am
PDX
-
LCY
41h 12m2 stops
British Airways Logo
7:50 am - 9:52 pm
LCY
-
PDX
22h 02m2 stops
$670British Airways
Tue, Feb 10 - Wed, Feb 25
American Airlines Logo
6:22 am - 10:40 am
PDX
-
LGW
20h 18m2 stops
American Airlines Logo
2:30 pm - 12:22 pm
LGW
-
PDX
29h 52m2 stops
$694American Airlines
Thu, Apr 30 - Tue, May 12
Icelandair Logo
3:30 pm - 11:45 am
PDX
-
LGW
12h 15m1 stop
Icelandair Logo
1:00 pm - 5:55 pm
LGW
-
PDX
12h 55m1 stop
$711Icelandair
Sat, May 16 - Sun, Jun 7

Lufthansa flights from Portland to London

Our best Lufthansa deals on Portland to London flight tickets
Lufthansa
Mar 31
PDX7:15 amPortland
21h 25m
2 stops
LHR12:40 pmLondon Heathrow
Apr 7
LHR6:30 amLondon Heathrow
23h 59m
2 stops
PDX10:29 pmPortland
$642
Find similar
Lufthansa
Jan 26
PDX9:50 amPortland
18h 00m
1 stop
LHR11:50 amLondon Heathrow
Feb 5
LHR11:35 amLondon Heathrow
14h 35m
1 stop
PDX6:10 pmPortland
$647
Find similar
Lufthansa
Jan 28
PDX9:50 amPortland
18h 00m
1 stop
LHR11:50 amLondon Heathrow
Feb 4
LHR7:25 amLondon Heathrow
19h 31m
1 stop
PDX6:56 pmPortland
$649
Find similar

Delta flights from Portland to London

Our best Delta deals on Portland to London flight tickets
Delta
Mar 16
PDX9:55 amPortland
17h 35m
2 stops
LHR10:30 amLondon Heathrow
Apr 23
LHR6:30 amLondon Heathrow
12h 40m
1 stop
PDX11:10 amPortland
$641
Find similar
Delta
Mar 25
PDX7:00 amPortland
19h 30m
2 stops
LCY9:30 amLondon City
Apr 2
LCY10:00 amLondon City
18h 59m
2 stops
PDX8:59 pmPortland
$681
Find similar
Delta
Mar 25
PDX7:00 amPortland
19h 30m
2 stops
LCY9:30 amLondon City
Apr 2
LCY10:00 amLondon City
18h 59m
2 stops
PDX8:59 pmPortland
$682
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portland to London 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 2, 2026.
Use the filters below to find and compare flights from Portland to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 3/16

9:55 am-10:30 am

2 stops17h 35m

London Heathrow

Thu 4/23

6:30 am-11:10 am

1 stop12h 40m

$641

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 3/31

9:50 am-11:50 am

2 stops18h 00m

London Heathrow

Tue 4/7

8:45 am-10:29 pm

2 stops21h 44m

$642

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 3/31

7:30 pm-1:00 pm

Nonstop9h 30m

London Heathrow

Tue 4/7

3:40 pm-5:40 pm

Nonstop10h 00m

$646

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 2/9

6:00 am-8:15 am

1 stop18h 15m

London Heathrow

Wed 2/25

1:45 pm-3:55 pm

Nonstop10h 10m

$648

PortlandLondon

PDX - LGW

PDXLGW

Portland

Thu 4/30

3:30 pm-2:40 pm

1 stop15h 10m

London Gatwick

Tue 5/12

3:40 pm-6:00 pm

1 stop34h 20m

$653

PortlandLondon

PDX - LCY

PDXLCY

Portland

Tue 3/3

1:27 pm-5:20 pm

2 stops19h 53m

London City

Tue 3/31

8:15 pm-11:10 am

1 stop22h 55m

$656

PortlandLondon

PDX - LCY

PDXLCY

Portland

Wed 1/28

1:25 pm-4:35 pm

1 stop19h 10m

London City

Wed 2/4

7:45 am-7:13 pm

2 stops19h 28m

$662

PortlandLondon

PDX - LCY

PDXLCY

Portland

Tue 2/10

7:38 am-8:50 am

2 stops41h 12m

London City

Wed 2/25

7:50 am-9:52 pm

2 stops22h 02m

$670

PortlandLondon

PDX - LGW

PDXLGW

Portland

Thu 4/30

6:22 am-10:40 am

2 stops20h 18m

London Gatwick

Tue 5/12

2:30 pm-12:22 pm

2 stops29h 52m

$694

PortlandLondon

PDX - LGW

PDXLGW

Portland

Sat 5/16

3:30 pm-11:45 am

1 stop12h 15m

London Gatwick

Sun 6/7

1:00 pm-5:55 pm

1 stop12h 55m

$711

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

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?

What is the cheapest month to fly to London?

The cheapest month to fly to London from Portland is in October. Flight prices, which tend to average around $645, are often lower during this time because this is during the off-season. The month of November is another great option to travel to London, with average flight prices from Portland averaging around $659.

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

The cheapest day to depart from Portland to London is on a Tuesday. Travelers who choose to depart for London on a Tuesday will often find tickets for as low as $843. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $992. These prices are subject to change though, so be sure to set up a Price Alert for flights to London.

What is the cheapest time of day to depart on your flight to London?

Flying to London from Portland in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $728 when looking at flights departing in the afternoon. Flights to London are more costly in the evening, with an average ticket price of $923. Departure times in the evening fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Portland to London flight route?

Fly from Portland to London Heathrow for the best Portland - London flight prices

How far in advance should I book a flight to London?

You are more likely to see cheaper flights to London from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to London 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 from Portland for as low as $748 on momondo.

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

There are 4 cabin classes available to choose from on Portland to London 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 flights?

You could potentially save up to 19% on your flight if you consider stops on a Portland to London flight.

How have Portland to London flight prices changed over time?

As of January 2026, prices for Portland to London flights are approximately 10% cheaper when compared to flights at the same time last year.

When to book flights from Portland to London

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to London according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland to London (PDX to LON) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland to London

Best Price Found

$422

Fastest flight time

9h 30m

Direct flights

Every day

Airports in London

6 airports
The best one-way flight to London from Portland in the past 72 hours is $422. The best round-trip flight deal from Portland to London found on momondo in the last 72 hours is $622.
The fastest flight from Portland to London takes 9h 30m
Direct flights go from Portland to London every day.
There are 6 airports in London. From Portland there are direct flights to London Heathrow (LHR).
Search flight deals

  • How far is Portland to London by plane?

    The distance between Portland and London is about 4909.8 mi. Typically, this will take 9h 30m by plane in normal conditions.

  • When did momondo last update prices for flights from Portland Airport to London?

    Prices for flights from Portland Airport to London are refreshed on a daily basis.

  • How many operators does momondo search for flights from Portland Airport to London?

  • How old do you have to be to fly from Portland Airport to London?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London.

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

    The required travel and health documents for your London trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at London. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

  • What is the most popular plane model from Portland to London?

  • What is the most popular airline from Portland to London?

Best airlines flying from Portland to London

Compare and see reviews for airlines that fly from Portland to London with momondo
Airline
Rating
Free Cancellation
Price
IcelandairPriceFrom $489Free CancellationRating
7.1
593 reviews
Search Icelandair flights
DeltaPriceFrom $552Free CancellationRating
7.9
8,023 reviews
Search Delta flights
Virgin AtlanticPriceFrom $558Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
KLMPriceFrom $561Free CancellationRating
7.7
1,435 reviews
Search KLM flights
IberiaPriceFrom $577Free CancellationRating
7.0
3,058 reviews
Search Iberia flights
British AirwaysPriceFrom $589Free CancellationRating
6.7
7,640 reviews
Search British Airways flights
Alaska AirlinesPriceFrom $600Free CancellationRating
8.0
11,604 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $619Free CancellationRating
7.4
9,129 reviews
Search United Airlines flights
American AirlinesPriceFrom $634Free CancellationRating
7.2
11,075 reviews
Search American Airlines flights
FinnairPriceFrom $641Free CancellationRating
7.6
1,343 reviews
Search Finnair flights

  • Alaska Airlines Flights From Portland to London

    The lowest priced Alaska Airlines flight from Portland to London from the last 72 hours was $600. Generally, Alaska Airlines has 4 flights on this route every week with an average price of $1,498. Alaska Airlines is rated 8.0/10 by our users.

  • Finnair Flights From Portland to London

    Across 1,343 Finnair reviews on momondo, the average score is 7.6/10. Finnair flies from Portland to London about 4 times each week, with ticket deals ranging from $641 to $984. 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
Crawley
Brentwood
Watford
Wembley
Cobham
Folkestone
Romford
Richmond
Uxbridge
Chelmsford
Stansted

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Portland.

Can I find flights from Portland to London with flexible booking policies on momondo?

All flight searches from Portland to London on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Portland to London?

momondo helps you find the best flight between Portland and London by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Portland to London right now. Can momondo alert me if prices change?

Yes. momondo can track prices for Portland to London flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your London 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
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Find better results for your trip to the United Kingdom

Fly into one of these airports located in London

Airports listed have a maximum distance of 35.6 mi from London
London City Airport
London Gatwick Airport
London Heathrow Airport
London Luton Airport
London Southend Airport
London Stansted Airport