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Cheap flights from Portland to London from $285

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 5/4. 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.
Icelandair Logo
3:30 pm - 11:55 am
PDX
-
LHR
12h 25m
1 stop
Icelandair Logo
9:25 pm - 6:00 pm
LHR
-
PDX
28h 35m
1 stop
$600Icelandair
Thu, Apr 23 - Sun, May 3
Lufthansa Logo
9:50 am - 11:50 am
PDX
-
LHR
18h 00m
1 stop
Lufthansa Logo
7:40 am - 9:10 pm
LHR
-
PDX
20h 30m
2 stops
$601Lufthansa
Tue, Mar 3 - Wed, Mar 11
Icelandair Logo
3:30 pm - 8:20 pm
PDX
-
LHR
20h 50m
1 stop
Icelandair Logo
9:25 pm - 6:00 pm
LHR
-
PDX
28h 35m
1 stop
$602Icelandair
Tue, Mar 31 - Tue, Apr 7
Icelandair Logo
3:30 pm - 11:55 am
PDX
-
LHR
12h 25m
1 stop
Icelandair Logo
9:25 pm - 6:00 pm
LHR
-
PDX
28h 35m
1 stop
$604Icelandair
Tue, Mar 31 - Tue, Apr 7
Icelandair Logo
3:30 pm - 11:55 am
PDX
-
LHR
12h 25m
1 stop
Icelandair Logo
1:05 pm - 6:00 pm
LHR
-
PDX
12h 55m
1 stop
$606Icelandair
Sat, Apr 18 - Wed, Apr 29
Lufthansa Logo
9:50 am - 11:50 am
PDX
-
LHR
18h 00m
1 stop
Lufthansa Logo
8:15 pm - 9:10 pm
LHR
-
PDX
31h 55m
2 stops
$610Lufthansa
Tue, Mar 3 - Thu, Mar 12
Lufthansa Logo
3:15 pm - 1:20 pm
PDX
-
LHR
14h 05m
1 stop
Lufthansa Logo
10:50 am - 12:33 am
LHR
-
PDX
21h 43m
2 stops
$614Lufthansa
Tue, Apr 28 - Tue, May 5
Icelandair Logo
3:30 pm - 11:55 am
PDX
-
LHR
12h 25m
1 stop
Icelandair Logo
9:25 pm - 6:00 pm
LHR
-
PDX
28h 35m
1 stop
$616Icelandair
Tue, Mar 31 - Tue, Apr 7
Lufthansa Logo
9:50 am - 11:50 am
PDX
-
LHR
18h 00m
1 stop
Lufthansa Logo
11:10 am - 6:30 pm
LHR
-
PDX
39h 20m
2 stops
$621Lufthansa
Mon, Feb 23 - Tue, Mar 3
Lufthansa Logo
9:50 am - 11:50 am
PDX
-
LHR
18h 00m
1 stop
Lufthansa Logo
11:30 am - 6:55 pm
LHR
-
PDX
39h 25m
2 stops
$622Lufthansa
Mon, Feb 23 - Mon, Mar 2

Icelandair flights from Portland to London Heathrow Airport

Our best Icelandair deals on Portland to London Heathrow Airport flight tickets
Icelandair
Apr 7
PDX3:30 pmPortland
12h 25m
1 stop
LHR11:55 amLondon Heathrow
Apr 24
LHR1:05 pmLondon Heathrow
12h 55m
1 stop
PDX6:00 pmPortland
$600
Icelandair
Mar 31
PDX3:30 pmPortland
20h 50m
1 stop
LHR8:20 pmLondon Heathrow
Apr 7
LHR9:25 pmLondon Heathrow
28h 35m
1 stop
PDX6:00 pmPortland
$602
Icelandair
Mar 31
PDX3:30 pmPortland
12h 25m
1 stop
LHR11:55 amLondon Heathrow
Apr 7
LHR9:25 pmLondon Heathrow
28h 35m
1 stop
PDX6:00 pmPortland
$604

United Airlines flights from Portland to London Heathrow Airport

Our best United Airlines deals on Portland to London Heathrow Airport flight tickets
United Airlines
Mar 9
PDX3:15 pmPortland
13h 35m
1 stop
LHR11:50 amLondon Heathrow
Mar 19
LHR6:50 amLondon Heathrow
22h 08m
2 stops
PDX9:58 pmPortland
$630
United Airlines
Mar 9
PDX11:10 pmPortland
25h 00m
2 stops
LHR7:10 amLondon Heathrow
Mar 19
LHR6:35 amLondon Heathrow
23h 25m
2 stops
PDX11:00 pmPortland
$638
United Airlines
Mar 8
PDX7:05 pmPortland
33h 45m
1 stop
LHR11:50 amLondon Heathrow
Mar 16
LHR11:05 amLondon Heathrow
41h 53m
2 stops
PDX9:58 pmPortland
$642

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 February 4, 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

PortlandLondon

PDX - LHR

PDXLHR

Portland

Thu 4/23

3:30 pm-11:55 am

1 stop12h 25m

London Heathrow

Sun 5/3

9:25 pm-6:00 pm

1 stop28h 35m

$600

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 3/3

9:50 am-11:50 am

1 stop18h 00m

London Heathrow

Wed 3/11

7:40 am-9:10 pm

2 stops20h 30m

$601

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 3/31

3:30 pm-8:20 pm

1 stop20h 50m

London Heathrow

Tue 4/7

9:25 pm-6:00 pm

1 stop28h 35m

$602

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 3/31

3:30 pm-11:55 am

1 stop12h 25m

London Heathrow

Tue 4/7

9:25 pm-6:00 pm

1 stop28h 35m

$604

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sat 4/18

3:30 pm-11:55 am

1 stop12h 25m

London Heathrow

Wed 4/29

1:05 pm-6:00 pm

1 stop12h 55m

$606

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 3/3

9:50 am-11:50 am

1 stop18h 00m

London Heathrow

Thu 3/12

8:15 pm-9:10 pm

2 stops31h 55m

$610

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 4/28

3:15 pm-1:20 pm

1 stop14h 05m

London Heathrow

Tue 5/5

10:50 am-12:33 am

2 stops21h 43m

$614

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 3/31

3:30 pm-11:55 am

1 stop12h 25m

London Heathrow

Tue 4/7

9:25 pm-6:00 pm

1 stop28h 35m

$616

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 2/23

9:50 am-11:50 am

1 stop18h 00m

London Heathrow

Tue 3/3

11:10 am-6:30 pm

2 stops39h 20m

$621

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 2/23

9:50 am-11:50 am

1 stop18h 00m

London Heathrow

Mon 3/2

11:30 am-6:55 pm

2 stops39h 25m

$622

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 $674. 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 $679.

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

Our data shows that Sunday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $837. The most expensive day to fly to London Heathrow Airport is Saturday, with ticket prices averaging around $977.

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 $721. 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 $907.

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 $836 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 $748 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.

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

As of February 2026, prices for Portland to London Heathrow Airport flights are approximately 14% 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

$370

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 $370. The best round-trip flight deal from Portland to London Heathrow Airport found on momondo in the last 72 hours is $658.
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 $486Free CancellationRating
7.1
606 reviews
Search Icelandair flights
DeltaPriceFrom $551Free CancellationRating
7.9
8,148 reviews
Search Delta flights
Virgin AtlanticPriceFrom $558Free CancellationRating
7.5
678 reviews
Search Virgin Atlantic flights
KLMPriceFrom $561Free CancellationRating
7.7
1,448 reviews
Search KLM flights
IberiaPriceFrom $574Free CancellationRating
7.0
3,104 reviews
Search Iberia flights
British AirwaysPriceFrom $580Free CancellationRating
6.7
7,716 reviews
Search British Airways flights
Alaska AirlinesPriceFrom $582Free CancellationRating
8.0
11,838 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $607Free CancellationRating
7.4
9,235 reviews
Search United Airlines flights
American AirlinesPriceFrom $628Free CancellationRating
7.2
11,230 reviews
Search American Airlines flights
FinnairPriceFrom $641Free CancellationRating
7.6
1,357 reviews
Search Finnair flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Hounslow
Milton Keynes
Luton
Dover
Slough
Guildford
Crawley
Wembley
Dartford
Stratford-upon-Avon
Hayes
Croydon
Brentwood
Harrow
Watford
Cobham
Folkestone
Romford
Stansted

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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