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Cheap flights from London to Portland, Maine from £328

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 4/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — PWM
15 Aug — 22 Aug1
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 16 July 2026.

Thu 3/911:55
LHR
-
PWM
1 stop17h 30m
JetBlue
Wed 9/906:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Deal found 16/7£514
Wed 16/911:55
LHR
-
PWM
1 stop16h 57m
JetBlue
Mon 5/1006:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Deal found 14/7£517
Tue 6/1008:15
LHR
-
PWM
1 stop20h 37m
JetBlue
Tue 13/1006:00
PWM
-
LHR
1 stop22h 30m
JetBlue
Deal found 14/7£528
Tue 15/911:55
LHR
-
PWM
1 stop16h 57m
JetBlue
Wed 30/906:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Deal found 14/7£537
Wed 9/911:55
LHR
-
PWM
1 stop16h 57m
JetBlue
Sun 13/906:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Deal found 13/7£546
Mon 14/911:55
LHR
-
PWM
1 stop16h 57m
JetBlue
Thu 1/1006:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Deal found 14/7£555
Wed 16/911:55
LHR
-
PWM
1 stop16h 57m
JetBlue
Sat 3/1006:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Deal found 14/7£566
Thu 17/911:55
LHR
-
PWM
1 stop16h 57m
JetBlue
Tue 6/1006:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Deal found 14/7£569
Thu 12/1112:20
LHR
-
PWM
1 stop16h 23m
JetBlue
Sun 15/1106:30
PWM
-
LHR
1 stop22h 00m
JetBlue
Deal found 13/7£572
Wed 26/808:15
LHR
-
PWM
1 stop21h 10m
JetBlue
Wed 2/914:40
PWM
-
LHR
1 stop25h 05m
JetBlue
Deal found 12/7£573

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 16 July 2026.

Round-trip from

£514

One-way from

£328

Popular in

July

Cheapest in

February

Average price

£1,051
JetBlue
  • JetBlue
  • 3/9-9/9
  • 2 total stops
  • 27h 15m total
  • London to Portland
Search Deals
JetBlue
  • JetBlue
  • 4/9
  • 1 total stop
  • 30h 50m total
  • London to Portland
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£140 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 16 July 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
Fastest return journey

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Wed 9/9

11:55-23:52

1 stop16h 57m

Portland

Sun 13/9

06:00-20:45

1 stop9h 45m

£548

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 18/9

11:55-23:52

1 stop16h 57m

Portland

Tue 6/10

06:00-20:45

1 stop9h 45m

£569

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sun 20/9

11:55-23:52

1 stop16h 57m

Portland

Tue 6/10

06:00-20:45

1 stop9h 45m

£585

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 28/8

11:55-00:25

1 stop17h 30m

Portland

Fri 4/9

06:00-20:45

1 stop9h 45m

£601

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 19/9

11:55-23:52

1 stop16h 57m

Portland

Sat 3/10

06:00-20:45

1 stop9h 45m

£618

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Wed 9/9

13:50-23:32

2 stops14h 42m

Portland

Sun 13/9

18:53-20:40

1 stop20h 47m

£712

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 27/8

07:25-19:24

2 stops16h 59m

Portland

Thu 3/9

19:35-10:40

1 stop10h 05m

£774

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 3/9

06:30-00:59

2 stops23h 29m

Portland

Wed 9/9

12:55-13:15

2 stops19h 20m

£776

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 28/8

12:10-23:32

2 stops16h 22m

Portland

Fri 4/9

14:38-09:20

2 stops13h 42m

£800
Cheapest one-way

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 13/10

13:05-17:51

3 stops33h 46m

£455

Flights are sorted by cheapest return flights first.

Deals found on 16/7

Showing 1-10 of 18 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, October is the cheapest month in which you can book a flight from London to Portland, Maine (average of £120). Flying from London to Portland, Maine in June is currently the most expensive (average of £651). 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?

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.

Newark (EWR) – chosen by Cheapflights users on 39% 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.

Atlanta (ATL) is the most affordable one-stop option, with an average return flight price of £472.

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 30m.

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 33m.

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 16 July 2026.
Get a feel of what it's like to fly with United Airlines and JetBlue 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
9,997 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

Crew

8.1

Overall

7.4

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
United Airlines
7.4
Good
9,997 reviews
United Airlines
7.4
Good
9,997 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

Crew

8.1

Overall

7.4

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
JetBlue
7.1
Good
3,012 reviews
United Airlines
7.4
Good
9,997 reviews
Check prices

Boarding

7.7

Entertainment

7.1

Food

6.6

Comfort

7.3

Crew

8.1

Overall

7.4

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this

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 can get you from London to Portland, Maine in just under 16h 57m. Your travel time can differ by up to . The distance between London and Portland, Maine is about 3173 mi.

  • 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, October is the cheapest month in which you can book a flight from London to Portland, Maine (average of £120). Flying from London to Portland, Maine in June is currently the most expensive (average of £651). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 16 July 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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