LON - PWM

£386 Find Cheap Flights from London to Portland

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Portland departing on 18/5. 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 Portland

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Portland, 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 London to Portland, as well as popular online travel agencies
Travellers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 29% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Everything you should know

Cheapest return fare
£575
Typical prices: £724-£529
JetBlue
Mon 7/9Sun 20/9
LHR - PWM • 1 stop
Cheapest one-way flight
£386
Multiple Airlines
Mon 18/5
LHR - PWM • 3 stops
Top airlines
Cheapest • from £575 (return)
Best reviews • 7.4 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Direct flights
Not available
There are currently no direct flights between London and Portland. You’ll need at least 1 connection.
Insights
Insights
Insights
Insights
Top stopover airports
Cheapest • Avg £745 (return)
Shortest trip • 11h 28m (one-way)
Insights
Insights
Insights
Insights
When to travel
Cheapest • 71% price drop
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Portland!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from London to Portland (LON-PWM)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from London to Portland 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 return flight deals from London to Portland

Mon, 7 Sep - Sun, 20 Sep
JetBlue Logo
08:15 - 12:21
LHR
-
PWM
33h 06m
1 stop
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
£575JetBlue
Thu, 24 Sep - Tue, 29 Sep
JetBlue Logo
08:15 - 23:52
LHR
-
PWM
20h 37m
1 stop
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
£617JetBlue
Thu, 1 Oct - Sun, 4 Oct
JetBlue Logo
08:15 - 23:52
LHR
-
PWM
20h 37m
1 stop
JetBlue Logo
06:00 - 20:45
PWM
-
LHR
9h 45m
1 stop
£628JetBlue
Mon, 7 Sep - Sun, 20 Sep
United Airlines Logo
07:25 - 10:02
LHR
-
PWM
31h 37m
2 stops
United Airlines Logo
19:35 - 21:35
PWM
-
LHR
21h 00m
2 stops
£669United Airlines
Thu, 24 Sep - Tue, 29 Sep
United Airlines Logo
13:50 - 23:27
LHR
-
PWM
14h 37m
2 stops
United Airlines Logo
10:04 - 05:55
PWM
-
LHR
14h 51m
2 stops
£695United Airlines
Wed, 17 Jun - Wed, 24 Jun
JetBlue Logo
11:55 - 00:25
LHR
-
PWM
17h 30m
1 stop
JetBlue Logo
14:30 - 09:30
PWM
-
LHR
14h 00m
1 stop
£712JetBlue
Wed, 17 Jun - Wed, 24 Jun
Virgin Atlantic Logo
09:40 - 23:05
LHR
-
PWM
18h 25m
2 stops
Virgin Atlantic Logo
06:00 - 07:55
PWM
-
LHR
20h 55m
2 stops
£761Virgin Atlantic
Mon, 1 Jun - Mon, 8 Jun
Scandinavian Airlines Logo
07:05 - 00:43
LHR
-
PWM
22h 38m
2 stops
Scandinavian Airlines Logo
06:25 - 14:35
PWM
-
LHR
27h 10m
2 stops
£761Scandinavian Airlines
Mon, 1 Jun - Mon, 8 Jun
Delta Logo
09:55 - 23:09
LHR
-
PWM
18h 14m
2 stops
Delta Logo
14:59 - 06:45
PWM
-
LHR
10h 46m
1 stop
£776Delta
Mon, 1 Jun - Mon, 8 Jun
Virgin Atlantic Logo
13:25 - 23:09
LHR
-
PWM
14h 44m
1 stop
Virgin Atlantic Logo
18:57 - 13:15
PWM
-
LHR
13h 18m
1 stop
£778Virgin Atlantic
Booking Insights

KAYAK’s insights & trends for London to Portland flights

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

How much is a return flight from London to Portland, Maine?

This analysis is based on the cheapest return trip price found on KAYAK in the last 12 months by searching for a flight from London to Portland, Maine departing in September.

What is the cheapest month to fly from London to Portland?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London to Portland, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from London to Portland is October, where tickets cost £120 (return) on average. On the other hand, the most expensive months are January and April, where the average cost of round-trip tickets is £592 and £538 respectively.

Good to know - Cheap tickets from London to Portland

Low seasonJanuary
Cheapest flight£386
Best time to beat the crowds (10% less expensive on average)
Most popular time to fly and prices are also 12% lower on average.
Flight from London Heathrow Airport to Portland

When to book flights from London to Portland

Are your dates flexible? Find out the best times to travel from London to Portland based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns 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 flights from London to Portland

  • What is the cheapest flight from London to Portland?

    In the last 3 days, the lowest price for a flight from London to Portland was £386 for a one-way ticket and £575 for a return.

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

    There are 4 airports in London (London Gatwick, London Heathrow, London Luton, and London Stansted.) and only 1 airport in Portland (Portland). The cheapest flights are generally found on the London Heathrow Airport to Portland flight route.

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

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

  • Which airline alliances offer flights from London to Portland?

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

  • Which is the best airline for flights from London to Portland, United Airlines or JetBlue?

    The two airlines most popular with KAYAK users for flights from London to Portland are United Airlines and JetBlue. With an average price for the route of £709 and an overall rating of 7.4, United Airlines is the most popular choice. JetBlue is also a great choice for the route, with an average price of £647 and an overall rating of 7.1.

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

    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 London to Portland.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Portland from London 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 London to Portland?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Portland with an airline and back to London with another airline.

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

    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 Portland from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from London to Portland

 
See real verified KAYAK customer reviews for airlines flying from London to Portland. 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 London to Portland? 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 9684 reviews
8.1Crew
6.6Food
7.3Comfort
7.7Boarding
7.1Entertainment
Airline reviews

Seats very comfortable; service efficient and pleasant; flight was on-time; boarding organized.

10.0 ExcellentEirene, May 2026
YYZ - EWR
Read more United Airlines reviews

Seats very comfortable; service efficient and pleasant; flight was on-time; boarding organized.

Seats were not super comfortable and food was not good at all. If I had a chance I would definitely fly a different airline. Of course they are better than any budget airline, but not by much.

Overall a good experience, but no wifi available for free or for purchase and we got wet from condensation or other water source during descent.

Very friendly and helpful staff on board and United was excellent when I missed my onward flight due to the delay in London. Very well organised meant much less stress

Flew steerage class. Short on leg room unless you pay more. No window unless you pay more. Etc. United is trying to squeeze every cent from you. It doesn’t make for any loyalty.

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.

Flight crew was super friendly and helpful. Food was frequent and honestly pretty good. Plenty of on-board entertainment. Economy seats are super cramped for such a long flight, but the crew allowed people to get up and stretch, and kids could wander with their parents, so we all made it work. Overall a very good experience.

Given us a free miles or free flight for waiting for 9 hours I didn’t get home till 5am in the morning and I was supposed to be home at 9:30 touch down.

Easy experience even with the outbound flight being delayed. The seating and space was comfortable and the crew seemed very nice and helpful.

I have always loved JetBlue and had no complaints on my last trip… I will always recommend then. Thank you JetBlue

Excellent price. Everything on time. two bad parts. Kayak said I couldn't sign in for the flight online, but I got an email at the same time from Jet Blue and they let me sign in online. Second bad part was that, although I had provided my known traveler number, neither of my boarding passes, for this flight and the previous one, had TSA pre-check showing.

The comfortability was very good. Except, when entering the craft the the first steward never greeted us upon entering the airplane. He spoke too fast where his words were all jumbled and difficult to understand.

Jet blue was great But the Jayak system Wasa pure nightmare and wasted so much of my time and energy by not giving me a way to access jet blue to check in the flight back I didn’t even get the number confirmation code 24 hours before. Because I didn’t receive the email with the confirmation code I could NoT CHECk IN. I spoke to a kayak third party and they informed me I could not carry a carry on, on the flight which caused me so much extra stress it was just too much. You can be sure I will not be using it recommending your site. Again.

There was a screen but no earphones that could use the older input so I could listen to anything.

My experience with JetBlue was fine BUT I am very upset with Kayak! JetBlue had delayed our scheduled departure by an hour and you NEVER notified me of the change. I did not hear directly from JetBlue because the trip was booked through Kayak, a mistake I will not repeat. Your reminder of the our trip last week still had the WRONG departure time. Our return trip has also changed, and again no notice from you.

Jet blue just had great service overall! Only a little turbulence heading out of Austin, otherwise the jet stream helped the speed of the trip!

Right now I’m still in Jamaica waiting on a flight to New York which I should be in New York from the 30th and I’m here in Jamaica

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

Information on your arrival and departure airports