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Cheap flights from London to Portland, Maine from £393

LON — PWM
3 Oct — 10 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

Mon 28/915:20 -
1 stop13h 08m
Tue 24/1115:41 -
1 stop12h 29m
Deal found 29/8£557
Thu 15/1007:05 -
2 stops22h 05m
Thu 22/1006:04 -
2 stops30h 36m
Deal found 31/8£570
Thu 1/1016:00 -
1 stop12h 28m
Tue 24/1105:50 -
1 stop9h 45m
Deal found 29/8£579
Sat 17/1006:40 -
2 stops22h 30m
Sat 24/1014:33 -
2 stops27h 07m
Deal found 1/9£593
Thu 3/1219:30 -
2 stops33h 51m
Sun 6/1206:00 -
2 stops22h 20m
Deal found 2/9£601
Thu 1/1007:45 -
1 stop11h 06m
Sat 21/1115:41 -
1 stop13h 44m
Deal found 29/8£602
Sun 27/908:15 -
1 stop20h 39m
Sun 4/1006:00 -
1 stop22h 30m
Deal found 30/8£610
Sat 26/908:15 -
1 stop20h 39m
Sat 3/1006:00 -
1 stop9h 45m
Deal found 29/8£639
Thu 15/1007:05 -
2 stops22h 05m
Wed 21/1006:04 -
2 stops22h 31m
Deal found 30/8£648

Find flight deals from London to Portland

Round-trip from

£557

One-way from

£393

Popular in

July

Cheapest in

December

Average price

£879
United Airlines
  • United Airlines
  • 28/9-24/11
  • 2 total stops
  • 25h 37m total
  • London to Portland
Search Deals
JetBlue
  • JetBlue
  • 29/9-31/12
  • 1 total stop
  • 16h 59m total
  • London to Portland
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (£180 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

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 30/11

20:35-09:08

2 stops41h 33m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£399

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sun 13/12

10:00-10:14

3 stops53h 14m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£508

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 26/11

06:50-09:08

3 stops31h 18m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£508

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 28/9

13:55-16:24

3 stops31h 29m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£528

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sun 3/1

15:50-13:53

1 stop27h 03m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£564

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 15/10

07:05-00:10

2 stops22h 05m

Portland

Thu 22/10

06:04-17:40

2 stops30h 36m

£570

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 17/10

06:40-00:10

2 stops22h 30m

Portland

Sat 24/10

14:33-22:40

2 stops27h 07m

£593

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

Sat 26/9

08:15-23:54

1 stop20h 39m

Portland

Sat 3/10

06:00-20:45

1 stop9h 45m

£639

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 15/10

07:05-00:10

2 stops22h 05m

Portland

Wed 21/10

06:04-14:35

3 stops27h 31m

£695

Flights are sorted by cheapest return flights first.

Deals found on 2/9

Showing 1-10 of 14 resultsSorted by cheapest first
1
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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 £469). Flying from London to Portland, Maine in July is currently the most expensive (average of £991). 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 £559.

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
10,160 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Food

6.7

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
10,160 reviews
United Airlines
7.4
Good
10,160 reviews
Check prices

Entertainment

7.1

Boarding

7.7

Food

6.7

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 and JetBlue can get you from London to Portland, Maine in just under 20h 39m. Your travel time can differ by up to 1h 26m. 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.

  • 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 £469). Flying from London to Portland, Maine in July is currently the most expensive (average of £991). 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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