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Cheap flights from London to Portland, Maine from £435

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
14 Sep — 21 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 15 August 2026.

Mon 28/911:55 -
1 stop16h 59m
Mon 5/1006:00 -
1 stop9h 45m
Deal found 14/8£618
Mon 14/908:15 -
1 stop20h 39m
Mon 21/906:00 -
1 stop9h 45m
Deal found 14/8£633
Fri 11/911:55 -
1 stop16h 59m
Sun 20/906:00 -
1 stop9h 45m
Deal found 14/8£636
Fri 13/1112:20 -
1 stop16h 23m
Sun 22/1105:50 -
2 stops34h 10m
Deal found 12/8£645
Fri 13/1112:20 -
1 stop16h 23m
Sun 15/1106:30 -
1 stop22h 00m
Deal found 12/8£647
Fri 13/1107:25 -
1 stop21h 18m
Sun 15/1105:50 -
2 stops20h 20m
Deal found 12/8£657
Fri 11/908:00 -
2 stops20h 54m
Sun 20/906:00 -
2 stops30h 45m
Deal found 14/8£676
Wed 9/919:50 -
2 stops33h 06m
Wed 16/906:02 -
2 stops28h 58m
Deal found 12/8£690

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 15 August 2026.

Round-trip from

£636

One-way from

£435

Popular in

July

Cheapest in

December

Average price

£989
JetBlue
  • JetBlue
  • 25/9-2/10
  • 2 total stops
  • 26h 44m total
  • London to Portland
Search Deals
JetBlue
  • JetBlue
  • 10/10
  • 1 total stop
  • 20h 37m total
  • London to Portland
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (£179 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£28 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 15 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

Fri 11/9

11:55-23:54

1 stop16h 59m

Portland

Sun 20/9

06:00-20:45

1 stop9h 45m

£636

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Fri 11/9

08:00-23:54

2 stops20h 54m

Portland

Sun 20/9

06:00-17:45

2 stops30h 45m

£676

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 1/9

07:25-19:24

2 stops16h 59m

Portland

Tue 15/9

15:43-09:20

1 stop12h 37m

£740
Fastest return journey

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 9/9

15:20-23:32

1 stop13h 12m

Portland

Wed 16/9

06:06-21:25

1 stop10h 19m

£751

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 14/9

06:30-23:56

2 stops22h 26m

Portland

Mon 21/9

16:20-12:05

1 stop14h 45m

£753

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 28/9

09:55-23:28

2 stops18h 33m

Portland

Mon 5/10

16:45-13:15

2 stops15h 30m

£753

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 14/11

06:50-18:52

2 stops17h 02m

Portland

Tue 17/11

08:47-05:55

1 stop16h 08m

£757

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 24/9

06:50-18:17

2 stops16h 27m

Portland

Thu 1/10

10:43-05:55

1 stop14h 12m

£758
Cheapest one-way

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 10/10

08:15-23:52

1 stop20h 37m

£435

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 12/10

08:15-23:52

1 stop20h 37m

£436

Flights are sorted by cheapest return flights first.

Deals found on 10/8

Showing 1-10 of 13 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 £468). Flying from London to Portland, Maine in July is currently the most expensive (average of £989). 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.

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 £461.

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 15 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
10,108 reviews
Check prices

Entertainment

7.1

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.7

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
United Airlines
7.4
Good
10,108 reviews
United Airlines
7.4
Good
10,108 reviews
Check prices

Entertainment

7.1

Overall

7.4

Boarding

7.7

Crew

8.1

Comfort

7.3

Food

6.7

Reviews

1 / 20
4.0
Okay

Chris,Aug 2026

MIA - ORD

Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!

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 0 different airlines.

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

    JetBlue and United Airlines can get you from London to Portland, Maine in just under 16h 59m. Your travel time can differ by up to . The distance between London and Portland, Maine is about 3173 mi.

  • 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 £468). Flying from London to Portland, Maine in July is currently the most expensive (average of £989). 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

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

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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.

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