PWM - LHR

$330 Find Cheap Flights from Portland to London Heathrow Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Portland to London departing on 10/20. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Portland to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Portland to London, as well as popular online travel agencies
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41.299.237 searches in the past 7 days on KAYAK

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Everything you should know

Cheapest round-trip
$729
Delta
Sun 5/10Sat 5/16
PWM - LHR • 1 stop
Cheapest one-way
$330
American Airlines
Tue 10/20
PWM - LHR • 1 stop
Top airlines
Delta
Cheapest • from $729 (round-trip)
United Airlines
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Nonstop flights
Not available
There are currently no direct flights between Portland and London. You'll need at least 1 connection.
Insights
Insights
Insights
Insights
Top layover airports
Washington, D.C. (IAD)
Cheapest • Avg $853 (round-trip)
Philadelphia (PHL)
Shortest trip • 9h 58m (one-way)
Insights
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Insights
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to London!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Portland to London (PWM-LHR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portland to London that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Portland to London

Sun, May 10 - Sat, May 16
Delta Logo
6:00 am - 6:25 am
PWM
-
LHR
19h 25m
1 stop
Delta Logo
8:40 am - 12:43 am
LHR
-
PWM
21h 03m
2 stops
$729Delta
Wed, May 13 - Wed, May 20
Delta Logo
12:50 pm - 1:05 pm
PWM
-
LHR
19h 15m
2 stops
Delta Logo
6:30 am - 12:43 am
LHR
-
PWM
23h 13m
2 stops
$733Delta
Sun, May 10 - Sat, May 16
KLM Logo
2:38 pm - 10:20 am
PWM
-
LHR
14h 42m
1 stop
KLM Logo
11:15 am - 11:09 pm
LHR
-
PWM
16h 54m
1 stop
$735KLM
Sun, May 10 - Sat, May 16
KLM Logo
2:38 pm - 8:50 am
PWM
-
LHR
13h 12m
1 stop
KLM Logo
3:50 pm - 12:43 am
LHR
-
PWM
13h 53m
1 stop
$736KLM
Wed, Oct 14 - Wed, Oct 21
Virgin Atlantic Logo
6:00 am - 6:25 am
PWM
-
LHR
19h 25m
1 stop
Virgin Atlantic Logo
6:15 am - 10:23 pm
LHR
-
PWM
21h 08m
2 stops
$781Virgin Atlantic
Wed, Sep 30 - Wed, Oct 7
Virgin Atlantic Logo
1:35 pm - 11:20 am
PWM
-
LHR
16h 45m
1 stop
Virgin Atlantic Logo
6:15 am - 10:23 pm
LHR
-
PWM
21h 08m
2 stops
$860Virgin Atlantic
Sun, May 10 - Sat, May 16
JetBlue Logo
7:20 am - 9:30 am
PWM
-
LHR
21h 10m
1 stop
JetBlue Logo
8:15 am - 11:03 pm
LHR
-
PWM
19h 48m
1 stop
$896JetBlue
Mon, Aug 31 - Sat, Sep 5
Delta Logo
6:30 am - 6:20 am
PWM
-
LHR
18h 50m
1 stop
Delta Logo
6:30 am - 11:59 pm
LHR
-
PWM
22h 29m
2 stops
$906Delta
Mon, Aug 31 - Sat, Sep 5
KLM Logo
2:35 pm - 10:20 am
PWM
-
LHR
14h 45m
1 stop
KLM Logo
11:45 am - 11:59 pm
LHR
-
PWM
17h 14m
1 stop
$912KLM
Mon, Aug 31 - Sat, Sep 5
KLM Logo
2:35 pm - 8:50 am
PWM
-
LHR
13h 15m
1 stop
KLM Logo
11:20 am - 11:59 pm
LHR
-
PWM
17h 39m
1 stop
$913KLM
Booking Insights

KAYAK's insights & trends for Portland to London flights

Get data-powered insights and trends into flights from Portland to London to help you find the cheapest flights, the best time to fly and much more.

Which airlines provide the cheapest flights from Portland to London Heathrow Airport?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Portland to London Heathrow Airport were found on Delta ($729) and KLM ($735).

Find deals

Good to know

Cheapest flight$330
Flight from Portland to London Heathrow Airport

When to book flights from Portland to London

Are your dates flexible? Find out the best times to travel from Portland to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Portland to London Heathrow Airport flights

  • What is the cheapest flight from Portland to London Heathrow Airport?

    In the last 3 days, the lowest price for a flight from Portland to London Heathrow Airport was $330 for a one-way ticket and $729 for a round-trip.

  • Do I need a passport to fly between Portland and London Heathrow Airport?

    Yes

  • Which airports will I be using when flying from Portland to London Heathrow Airport?

    When flying out of Portland you will be using Portland. You will be landing at London Heathrow Airport, also known as London Heathrow.

  • Which aircraft models fly most regularly from Portland to London Heathrow Airport?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Portland to London Heathrow Airport?

    Star Alliance is the only airline alliance operating flights between Portland and London Heathrow Airport.

  • How does KAYAK find such low prices on flights from Portland to London Heathrow Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Portland to London Heathrow Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Portland to London Heathrow Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Portland is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Portland to London Heathrow Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London Heathrow Airport with an airline and back to Portland with another airline. Booking your flights between Portland and LHR can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Portland to London Heathrow Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Portland up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Portland to London

 
See real verified KAYAK customer reviews for airlines flying from Portland to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Portland to London? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 9680 reviews
8.1Crew
6.6Food
7.3Comfort
7.1Entertainment
7.7Boarding
Airline reviews

Some crew were unfriendly or in some cases just straight up rude.

6.0 GoodAnonymous, Apr 2026
SFO - YVR
Read more United Airlines reviews

Some crew were unfriendly or in some cases just straight up rude.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Was great in general, try to respect time and excuses when slight changes have been made, appreciated!

A long delay. Don't travel late in the day.

Super friendly with lots of drink options an entertainment. Friendly crew.

Standard flight with a drinks and a snack- overall very quick flight. The flight attendants were very strict, bordered on rude.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

United Airline crews were very friendly and very attentive. 12 hours flight was gone like in a shorter one.

Delayed - weather wasn't bad at either end. Also sat on tarmac in ORD.

Food was surprisingly delicious. Space in the seat is horrible when the seating front is reclined. Movie offerings were terrible. Crew was friendly and helpful.

Everything you need to know for your flight from Portland to London

Information on your arrival and departure airports

Portland (PWM)
Heathrow (LHR)