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Cheap flights from Portland, Maine to London from £248

PWM — LON
17 Nov — 24 Nov1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portland to London

Enter your travel dates to find the best prices.

Cheapest flights from Portland to London

Mon 16/1115:41 -
2 stops19h 39m
Wed 18/1109:00 -
2 stops43h 21m
Deal found 17/10£568
Mon 9/1117:08 -
1 stop33h 47m
Thu 12/1106:50 -
2 stops17h 12m
Deal found 16/10£574
Sat 7/1106:30 -
1 stop10h 10m
Sat 14/1108:05 -
1 stop20h 38m
Deal found 16/10£620
Mon 16/1106:30 -
1 stop10h 10m
Wed 18/1112:20 -
1 stop16h 23m
Deal found 15/10£625
Sat 24/1006:00 -
1 stop9h 45m
Sat 31/1008:05 -
1 stop19h 38m
Deal found 17/10£634
Sat 7/1114:05 -
1 stop11h 35m
Sat 14/1112:05 -
2 stops16h 16m
Deal found 16/10£647
Sat 28/1106:00 -
1 stop10h 20m
Thu 3/1206:50 -
2 stops17h 22m
Deal found 13/10£648
Sat 24/1005:15 -
2 stops23h 15m
Sat 31/1006:50 -
2 stops16h 12m
Deal found 17/10£649
Sat 14/1110:50 -
2 stops15h 20m
Sat 21/1112:05 -
2 stops16h 16m
Deal found 15/10£649

Find flight deals from Portland to London

Round-trip from

£562

One-way from

£248

Popular in

July

Cheapest in

February

Average price

£703
United Airlines
  • United Airlines
  • 15/3-17/3
  • 4 total stops
  • 46h 23m total
  • Portland to London
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JetBlue
  • JetBlue
  • 8/11-31/12
  • 1 total stop
  • 22h 00m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (£103 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£25 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2026
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Portland to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 8/11

06:30-09:30

1 stop22h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£248
Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 30/11

19:35-10:50

1 stop10h 15m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£256

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 8/11

15:40-10:25

1 stop13h 45m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£256

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 28/11

06:00-10:50

2 stops23h 50m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£304

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 8/11

15:10-20:05

3 stops23h 55m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£346

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

15:41-16:20

2 stops19h 39m

London Heathrow

Wed 18/11

09:00-23:21

2 stops43h 21m

£568

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

06:30-21:40

1 stop10h 10m

London Heathrow

Wed 18/11

12:20-23:43

1 stop16h 23m

£625

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 29/11

10:50-09:10

1 stop17h 20m

London Heathrow

Sun 6/12

09:00-23:24

2 stops19h 24m

£647

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 7/11

14:05-06:40

1 stop11h 35m

London Heathrow

Sat 14/11

12:05-23:21

2 stops16h 16m

£647

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 15/11

10:50-08:25

1 stop16h 35m

London Heathrow

Sat 21/11

09:00-23:21

2 stops19h 21m

£647

Flights are sorted by cheapest return flights first.

Deals found on 14/10

Showing 1-10 of 16 resultsSorted by cheapest first
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Best time to book a flight from Portland to London

Have a flexible travel schedule? Discover the best time to fly to London from Portland with our price prediction graph.
Estimated return price

Cheapflights Insights

Everything you need to know about your flight from Portland to London

No data available for this route at this time. Please check back soon.

Related info for your journey

  • What airport do you fly from for flights from Portland to London?

    Portland (PWM) is the airport you will fly out of if you book a flight from Portland to London. You should not have trouble finding flights to London from Portland; the airport handles an average of 0 outbound flights to London per day. You should also have plenty of airline options to choose from since 0 airlines have flights from the Portland airport to London. It is only a 2.9 mi journey to Portland (PWM) from Portland’s city center.

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

    There are many flights that can get you from Portland, Maine to London in 10h 10m. Fly via United Airlines or JetBlue to get the fastest option. The distance between Portland, Maine and London is about 3173 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Portland, Maine to London?

    The most popular flight routes from Portland, Maine to London are Portland - London Heathrow, Portland - London Gatwick and Portland - London City.

  • Can I find deals for flights from Portland to London that include hotel bookings?

    Yes. In addition to deals on Portland to London flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Portland to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to London.

  • Can I find deals for business class flights from Portland to London?

    Yes. Cheapflights offers flight deals from Portland to London by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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

Cheapflights helps you find that perfect flight to London from Portland 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 Portland to London with no change fees?

Certainly. Search results for flights to London from Portland shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Portland to London become cheaper?

Yes, Cheapflights offers price alerts on Portland to London flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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