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Cheap flights from London to Portland, Maine from £411

LON — PWM
10 Oct — 17 Oct1
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

Thu 3/1219:30 -
2 stops33h 51m
Sun 6/1206:00 -
2 stops22h 20m
Deal found 5/9£601
Tue 20/1018:45 -
2 stops34h 09m
Tue 27/1006:30 -
2 stops31h 00m
Deal found 5/9£644
Tue 20/1011:20 -
2 stops17h 34m
Mon 26/1005:50 -
2 stops21h 20m
Deal found 8/9£700
Wed 21/1013:50 -
2 stops14h 38m
Wed 28/1005:50 -
1 stop10h 45m
Deal found 6/9£750
Tue 20/1012:10 -
2 stops16h 18m
Tue 27/1008:49 -
1 stop17h 31m
Deal found 5/9£751
Tue 20/1012:10 -
2 stops16h 18m
Mon 26/1005:50 -
1 stop10h 45m
Deal found 8/9£752
Thu 3/1209:30 -
2 stops16h 12m
Sun 6/1219:55 -
1 stop19h 40m
Deal found 6/9£756
Tue 20/1012:00 -
1 stop11h 12m
Mon 26/1010:50 -
1 stop15h 30m
Deal found 8/9£768
Thu 22/1013:50 -
2 stops14h 38m
Thu 29/1008:49 -
1 stop17h 31m
Deal found 7/9£781

Find flight deals from London to Portland

Round-trip from

£601

One-way from

£411

Popular in

July

Cheapest in

December

Average price

£875
Scandinavian Airlines
  • Scandinavian Airlines
  • 3/12-6/12
  • 4 total stops
  • 56h 11m total
  • London to Portland
Search Deals
JetBlue
  • JetBlue
  • 10/10-31/12
  • 1 total stop
  • 20h 39m total
  • London to Portland
Search Deals
Highest demand for flights based on searches. 24% potential increase in price (£172 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£29 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
Search Deals

Cheapflights Fare Finder

 
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 London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 10/10

08:15-23:54

1 stop20h 39m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£412

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 26/11

15:40-11:56

1 stop25h 16m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£542

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 10/10

08:30-09:21

2 stops29h 51m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£558

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 3/12

19:30-00:21

2 stops33h 51m

Portland

Sun 6/12

06:00-09:20

2 stops22h 20m

£601

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 26/11

18:00-13:26

3 stops24h 26m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£639

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 20/10

18:45-23:54

2 stops34h 09m

Portland

Tue 27/10

06:30-17:30

2 stops31h 00m

£644

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 21/10

13:50-23:28

2 stops14h 38m

Portland

Wed 28/10

05:50-20:35

1 stop10h 45m

£750

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 20/10

12:10-23:28

2 stops16h 18m

Portland

Tue 27/10

08:49-06:20

1 stop17h 31m

£751

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 20/10

12:10-23:28

2 stops16h 18m

Portland

Mon 26/10

05:50-20:35

1 stop10h 45m

£752

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 3/12

09:30-20:42

2 stops16h 12m

Portland

Sun 6/12

19:55-20:35

1 stop19h 40m

£756

Flights are sorted by cheapest return flights first.

Deals found on 8/9

Sorted by cheapest first

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

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 £467). Flying from London to Portland, Maine in July is currently the most expensive (average of £987). 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?

Atlanta (ATL) – chosen by Cheapflights users on 35% of one-stop itineraries from London to Portland, Maine on Cheapflights.

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

Newark (EWR) is the most affordable one-stop option, with an average return flight price of £557.

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

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?

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 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
10,194 reviews
Check prices

Entertainment

7.1

Food

6.7

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

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
10,194 reviews
United Airlines
7.4
Good
10,194 reviews
Check prices

Entertainment

7.1

Food

6.7

Boarding

7.7

Comfort

7.3

Crew

8.1

Overall

7.4

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

  • 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?

    Scandinavian Airlines can get you from London to Portland, Maine in just under 33h 51m. 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 £467). Flying from London to Portland, Maine in July is currently the most expensive (average of £987). 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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