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Cheap flights from London to Portland, Maine from £458

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
LON — PWM
5 Sep — 12 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to Portland

Enter your travel dates to find the best prices.

Cheapest flights from London to Portland
Explore the most affordable flight options available from London to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 August 2026.

Tue 22/908:15 -
1 stop20h 39m
Tue 29/906:00 -
1 stop22h 30m
Deal found 2/8£541
Wed 30/911:55 -
1 stop16h 59m
Sun 4/1006:00 -
1 stop9h 45m
Deal found 2/8£550
Tue 22/908:15 -
1 stop20h 39m
Tue 29/906:00 -
2 stops25h 40m
Deal found 2/8£593
Tue 29/913:05 -
2 stops15h 49m
Tue 6/1006:00 -
2 stops24h 55m
Deal found 4/8£610
Tue 29/908:15 -
1 stop20h 39m
Tue 6/1006:00 -
1 stop9h 45m
Deal found 4/8£627
Wed 23/908:15 -
1 stop20h 39m
Wed 30/906:00 -
1 stop9h 45m
Deal found 3/8£638
Tue 22/907:05 -
2 stops21h 51m
Tue 29/906:02 -
2 stops22h 33m
Deal found 2/8£660
Wed 23/907:05 -
2 stops21h 51m
Wed 30/906:02 -
3 stops28h 58m
Deal found 3/8£672
Tue 6/1008:00 -
2 stops20h 54m
Mon 12/1006:00 -
2 stops31h 50m
Deal found 5/8£676
Tue 29/908:15 -
1 stop20h 39m
Tue 6/1016:15 -
2 stops16h 30m
Deal found 4/8£686

Find flight deals from London to Portland

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Portland (PWM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 6 August 2026.

Round-trip from

£541

One-way from

£458

Popular in

July

Cheapest in

December

Average price

£916
JetBlue
  • JetBlue
  • 22/9-29/9
  • 2 total stops
  • 43h 09m total
  • London to Portland
Search Deals
10/10
  • 10/10
  • 2 total stops
  • 17h 32m total
  • London to Portland
Search Deals
Highest demand for flights based on searches. 24% potential increase in price (£171 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£30 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from London to Portland 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, Cheapflights users made 858,174 searches. Data last updated 6 August 2026.
Use the filters below to find and compare flights from London to Portland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 30/9

11:55-23:54

1 stop16h 59m

Portland

Sun 4/10

06:00-20:45

1 stop9h 45m

£550

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 22/9

08:15-23:54

1 stop20h 39m

Portland

Tue 29/9

06:00-12:40

2 stops25h 40m

£593

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 29/9

13:05-23:54

2 stops15h 49m

Portland

Tue 6/10

06:00-11:55

2 stops24h 55m

£610

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 22/9

07:05-23:56

2 stops21h 51m

Portland

Tue 29/9

06:02-09:35

2 stops22h 33m

£660

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 23/9

07:05-23:56

2 stops21h 51m

Portland

Wed 30/9

06:02-16:00

3 stops28h 58m

£672

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 6/10

12:10-23:28

2 stops16h 18m

Portland

Mon 12/10

10:43-05:55

1 stop14h 12m

£723

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 14/9

12:10-23:32

2 stops16h 22m

Portland

Mon 21/9

14:38-10:25

2 stops14h 47m

£726

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 30/9

07:30-18:12

2 stops15h 42m

Portland

Sun 4/10

18:55-07:15

1 stop31h 20m

£727
Fastest return journey

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 16/9

12:15-19:24

1 stop12h 09m

Portland

Wed 23/9

15:43-09:20

1 stop12h 37m

£754
Cheapest one-way

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 10/10

11:20-23:52

2 stops17h 32m

£458

Flights are sorted by cheapest return flights first.

Deals found on 1/8

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

Best time to book a flight from London to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from London with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

What is the cheapest month to book a flight from London to Portland, Maine?

Currently, December is the cheapest month in which you can book a flight from London to Portland, Maine (average of £470). Flying from London to Portland, Maine in July is currently the most expensive (average of £993). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

How much does it cost for a return flight from London to Portland, Maine?

Airfare is below average for this route at the moment.
London to Portland, Maine flights typically cost between £893 and £993 in September.
The cheapest return price found within the last 5 days was £541 on JetBlue (22 Sept–29 Sept).

What’s the top stopover airport for flights from London to Portland, Maine?

Share of one-stop return flights from London to Portland, Maine chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Atlanta (ATL) – chosen by Cheapflights users on 38% of one-stop itineraries from London to Portland, Maine on Cheapflights.

What’s the cheapest stopover airport for flights from London to Portland, Maine?

Average return fare for one-stop flights from London to Portland, Maine, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

New York (JFK) is the most affordable one-stop option, with an average return flight price of £463.

What’s the fastest stopover option from London to Portland, Maine?

Shortest average travel time for one-stop one-way flights from London to Portland, Maine, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Newark (EWR) have the shortest average one-way travel time for one-stop routes: 11h 10m.

Which airport typically offers the quickest stopover for flights from London to Portland, Maine?

Average stopover duration for one-stop one-way flights from London to Portland, Maine, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Newark (EWR) offer the fastest connection on this route, with an average stopover time of 1h 27m.

Reviews of airlines servicing Portland

Get insights into the airlines that provide service to Portland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portland. Reviews last updated 6 August 2026.
Get a feel of what it's like to fly with United Airlines from London to Portland by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
10,072 reviews
Check prices

Overall

7.4

Comfort

7.3

Food

6.7

Crew

8.1

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
United Airlines
7.4
Good
10,072 reviews
United Airlines
7.4
Good
10,072 reviews
Check prices

Overall

7.4

Comfort

7.3

Food

6.7

Crew

8.1

Entertainment

7.1

Boarding

7.7

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible

Related info for your journey

Find useful and relevant information for your journey from London to Portland. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Portland from London?

    If you book a flight to Portland from London, you will be flying to Portland, which is the city’s only airport. Portland (PWM) is located 2.9 mi from the center of Portland. There are 0 flights from London to Portland per day from 1 airline.

  • How long is the flight from London to Portland, Maine?

    JetBlue, Icelandair, and Scandinavian Airlines can get you from London to Portland, Maine in just under 15h 49m. Your travel time can differ by up to 6h 02m. The distance between London and Portland, Maine is about 3173 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What is the cheapest airline to fly from London to Portland, Maine round-trip?

    Currently priced at £542, United Airlines will fly you from London to Portland, Maine and back. In addition to United Airlines, many other airlines offer competitively priced options for your trip. United Airlines is 24% cheaper than the average price of flights available within the next 90 days to this destination.

  • Can I find deals for flights from London to Portland that include hotel bookings?

    Yes. In addition to deals on London to Portland flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to Portland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Portland.

  • Can I find deals for business class flights from London to Portland?

    Yes. Cheapflights offers flight deals from London to Portland by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from London to Portland, Maine?

    Currently, December is the cheapest month in which you can book a flight from London to Portland, Maine (average of £470). Flying from London to Portland, Maine in July is currently the most expensive (average of £993). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from London to Portland

Discover the top airline that operate flights from London to Portland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 6 August 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest£542Average£735FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from London to Portland?

When you search for this flight from London to Portland, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from London to Portland?

Cheapflights helps you find that perfect flight to Portland from London by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from London to Portland with no change fees?

Need flexible booking options for your flight to Portland from London? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from London to Portland become cheaper?

Of course! You can now track prices for flights from London to Portland and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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