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Cheap flights from Portland, Maine to London from £225

PWM — LON
1 Dec — 8 Dec1
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 16/1108:49 -
1 stop19h 21m
Wed 18/1106:50 -
2 stops21h 31m
Deal found 29/10£576
Sat 7/1106:30 -
1 stop10h 10m
Sat 14/1112:20 -
1 stop16h 23m
Deal found 29/10£579
Thu 12/1106:30 -
1 stop10h 10m
Tue 17/1112:20 -
1 stop16h 23m
Deal found 29/10£622
Mon 16/1106:30 -
1 stop10h 10m
Wed 18/1112:20 -
1 stop16h 23m
Deal found 29/10£623
Fri 13/1106:30 -
1 stop22h 00m
Wed 18/1112:20 -
1 stop16h 23m
Deal found 29/10£629
Fri 27/1108:49 -
2 stops31h 11m
Fri 4/1209:00 -
2 stops39h 25m
Deal found 28/10£632
Fri 27/1106:00 -
1 stop22h 00m
Fri 4/1208:40 -
2 stops20h 12m
Deal found 28/10£635
Thu 26/1106:00 -
1 stop20h 50m
Thu 3/1211:45 -
2 stops17h 36m
Deal found 29/10£647
Thu 12/1108:49 -
1 stop18h 36m
Wed 18/1112:05 -
2 stops16h 16m
Deal found 29/10£653

Find flight deals from Portland to London

Round-trip from

£576

One-way from

£225

Popular in

July

Cheapest in

February

Average price

£645
United Airlines
  • United Airlines
  • 16/11-18/11
  • 3 total stops
  • 40h 52m total
  • Portland to London
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JetBlue
  • JetBlue
  • 15/11-31/12
  • 1 total stop
  • 22h 00m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£89 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£23 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 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 15/11

06:30-09:30

1 stop22h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£225

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 26/3

06:00-21:20

1 stop11h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£249

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 23/11

10:50-09:10

1 stop17h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£259
Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 24/11

19:35-10:50

1 stop10h 15m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£259

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 16/11

08:49-09:10

1 stop19h 21m

London Heathrow

Wed 18/11

06:50-23:21

2 stops21h 31m

£576

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 15/11

08:47-07:55

1 stop18h 08m

London Heathrow

Thu 19/11

09:00-23:21

2 stops19h 21m

£653

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 12/12

09:12-06:20

1 stop16h 08m

London Heathrow

Sat 19/12

09:00-23:59

2 stops19h 59m

£653

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 25/11

05:50-07:10

2 stops20h 20m

London Heathrow

Sat 12/12

12:05-23:24

2 stops16h 19m

£656

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 11/1

19:50-21:20

1 stop20h 30m

London Heathrow

Fri 15/1

06:50-21:03

2 stops19h 13m

£662

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 15/11

16:03-08:05

1 stop11h 02m

London Heathrow

Thu 19/11

08:55-23:31

1 stop19h 36m

£676

Flights are sorted by cheapest return flights first.

Deals found on 30/10

Showing 1-10 of 12 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 19h 21m. Fly via United Airlines to get the fastest option. The distance between Portland, Maine and London is about 3173 mi.

  • 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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