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Cheap flights from London to Portland, Maine from £397

LON — PWM
13 Nov — 20 Nov1
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 3/1218:40 -
2 stops34h 41m
Sun 6/1206:00 -
2 stops30h 40m
Deal found 9/10£628
Wed 11/1112:20 -
1 stop16h 23m
Wed 18/1106:30 -
1 stop10h 10m
Deal found 13/10£703
Sat 7/1108:05 -
1 stop20h 38m
Sat 14/1106:30 -
1 stop10h 10m
Deal found 10/10£706
Wed 11/1118:30 -
2 stops34h 13m
Wed 18/1106:30 -
2 stops30h 00m
Deal found 13/10£708
Mon 9/1110:30 -
2 stops18h 13m
Mon 16/1106:30 -
2 stops22h 10m
Deal found 12/10£710
Wed 9/1206:00 -
2 stops18h 25m
Wed 16/1209:12 -
1 stop20h 13m
Deal found 9/10£738
Mon 23/1112:05 -
2 stops16h 16m
Mon 30/1119:35 -
1 stop10h 15m
Deal found 9/10£742
Wed 11/1112:05 -
2 stops16h 16m
Wed 18/1108:49 -
1 stop20h 36m
Deal found 13/10£742
Mon 9/1106:00 -
2 stops17h 49m
Mon 16/1110:50 -
1 stop14h 30m
Deal found 12/10£746

Find flight deals from London to Portland

Round-trip from

£628

One-way from

£397

Popular in

July

Cheapest in

February

Average price

£930
Scandinavian Airlines
  • Scandinavian Airlines
  • 3/12-6/12
  • 4 total stops
  • 65h 21m total
  • London to Portland
Search Deals
7/12-31/12
  • 7/12-31/12
  • 2 total stops
  • 41h 33m total
  • London to Portland
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£133 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£28 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 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 7/12

20:35-09:08

2 stops41h 33m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£397

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 4/11

13:55-09:08

3 stops48h 13m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£453

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 5/11

12:15-09:08

2 stops25h 53m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£474

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Sat 14/11

09:20-23:43

2 stops19h 23m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£478

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 4/11

07:25-23:43

1 stop21h 18m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£619

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 3/12

18:40-00:21

2 stops34h 41m

Portland

Sun 6/12

06:00-17:40

2 stops30h 40m

£628

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 2/11

18:30-23:43

2 stops34h 13m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£632

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 2/11

14:50-16:47

2 stops54h 57m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£635
Fastest return journey

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 3/11

12:20-23:43

1 stop16h 23m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£661

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 2/11

08:05-23:43

1 stop20h 38m

Portland

Wed 31/12

00:00-06:00

Nonstop0h 00m

£668

Flights are sorted by cheapest return flights first.

Deals found on 12/10

Showing 1-10 of 16 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, January is the cheapest month in which you can book a flight from London to Portland, Maine (average of £606). Flying from London to Portland, Maine in July is currently the most expensive (average of £1,010). 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?

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?

Newark (EWR) is the most affordable one-stop option, with an average return flight price of £618.

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

Flights via Philadelphia (PHL) have the shortest average one-way travel time for one-stop routes: 11h 28m.

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 38m.

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
10,362 reviews
Check prices

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Asha,Sept 2026

LGA - IAH

The flight was on time and boardi g was very organized and timely. Snacks are awful and having one little glass of juice was terrible. Fortunately, I had my water to keep me hydrated.
United Airlines
7.4
Good
10,362 reviews
United Airlines
7.4
Good
10,362 reviews
Check prices

Boarding

7.7

Comfort

7.3

Overall

7.4

Food

6.7

Crew

8.1

Entertainment

7.1

Reviews

1 / 20
8.0
Excellent

Asha,Sept 2026

LGA - IAH

The flight was on time and boardi g was very organized and timely. Snacks are awful and having one little glass of juice was terrible. Fortunately, I had my water to keep me hydrated.

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, Austrian Airlines, and United Airlines can get you from London to Portland, Maine in just under 16h 16m. Your travel time can differ by up to 18h 25m. 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, January is the cheapest month in which you can book a flight from London to Portland, Maine (average of £606). Flying from London to Portland, Maine in July is currently the most expensive (average of £1,010). 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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