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Cheap flights from Portland, Maine to London from £255

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 23/7. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LON
23 Jun — 30 Jun1
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
Explore the most affordable flight options available from Portland to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 May 2026.

Wed 11/1119:22
PWM
-
LHR
1 stop10h 28m
United Airlines
Fri 13/1106:50
LHR
-
PWM
2 stops16h 23m
United Airlines
Deal found 19/5£565
Tue 10/1114:35
PWM
-
LHR
2 stops13h 45m
Scandinavian Airlines
Tue 17/1119:30
LHR
-
PWM
2 stops33h 19m
Scandinavian Airlines
Deal found 20/5£618
Tue 10/1106:30
PWM
-
LHR
1 stop18h 50m
Delta
Tue 17/1106:30
LHR
-
PWM
2 stops20h 53m
Delta
Deal found 19/5£645
Mon 2/1112:50
PWM
-
LHR
2 stops15h 30m
Delta
Sat 7/1106:30
LHR
-
PWM
2 stops20h 53m
Delta
Deal found 20/5£648
Mon 2/1106:00
PWM
-
LHR
2 stops20h 10m
Multiple Airlines
Sat 7/1107:25
LHR
-
PWM
1 stop21h 18m
Multiple Airlines
Deal found 20/5£652
Tue 17/1110:00
PWM
-
LGW
2 stops18h 00m
Delta
Sat 21/1110:00
LGW
-
PWM
2 stops18h 49m
Delta
Deal found 21/5£653
Tue 10/1111:17
PWM
-
LHR
1 stop16h 08m
Austrian Airlines
Tue 17/1108:00
LHR
-
PWM
1 stop15h 13m
Austrian Airlines
Deal found 23/5£658
Mon 19/1014:35
PWM
-
LCY
2 stops13h 55m
Delta
Mon 26/1007:45
LCY
-
PWM
2 stops18h 38m
Delta
Deal found 20/5£667
Mon 19/1014:35
PWM
-
LGW
2 stops14h 05m
Delta
Mon 26/1010:00
LGW
-
PWM
2 stops17h 49m
Delta
Deal found 20/5£709
Tue 3/1106:30
PWM
-
LGW
2 stops21h 40m
Turkish Airlines
Tue 10/1106:25
LGW
-
PWM
2 stops22h 18m
Turkish Airlines
Deal found 21/5£759
Fri 3/709:52
PWM
-
LGW
1 stop19h 08m
Multiple Airlines
Fri 10/714:00
LGW
-
PWM
1 stop24h 12m
Multiple Airlines
Deal found 19/5£776
Sat 30/514:38
PWM
-
LGW
2 stops13h 42m
Delta
Sat 6/610:25
LGW
-
PWM
2 stops19h 18m
Delta
Deal found 19/5£783

Find flight deals from Portland to London

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to London (LON). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 24 May 2026.

Round-trip from

£565

One-way from

£255

Popular in

July

Cheapest in

October

Average price

£544
United Airlines
  • United Airlines
  • 11/11-13/11
  • 3 total stops
  • 26h 51m total
  • Portland to London
Search Deals
Virgin Atlantic
  • Virgin Atlantic
  • 23/7
  • 1 total stop
  • 19h 25m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£132 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£30 potential savings vs. average return price).
Search Deals
Average for round-trip flights in May 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portland to London that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 24 May 2026.
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 - LHR

PWMLHR

Portland

Wed 11/11

19:22-10:50

1 stop10h 28m

London Heathrow

Fri 13/11

06:50-18:13

2 stops16h 23m

£565

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 10/11

06:30-06:20

1 stop18h 50m

London Heathrow

Tue 17/11

06:30-22:23

2 stops20h 53m

£645

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 10/11

14:35-08:05

1 stop12h 30m

London Heathrow

Tue 24/11

06:30-23:49

2 stops22h 19m

£645

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 17/11

06:00-06:25

1 stop19h 25m

London Heathrow

Sat 21/11

06:30-22:23

2 stops20h 53m

£645

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 1/9

16:47-13:15

2 stops15h 28m

London Heathrow

Sat 12/9

08:40-23:59

2 stops20h 19m

£650

PortlandLondon

PWM - LGW

PWMLGW

Portland

Tue 17/11

10:00-09:00

2 stops18h 00m

London Gatwick

Sat 21/11

10:00-23:49

2 stops18h 49m

£653

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 1/9

14:53-10:20

1 stop14h 27m

London Heathrow

Sat 12/9

11:45-23:59

1 stop17h 14m

£667
Fastest return journey

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 10/11

14:35-08:05

1 stop12h 30m

London Heathrow

Tue 24/11

16:10-23:49

1 stop12h 39m

£667

PortlandLondon

PWM - LCY

PWMLCY

Portland

Mon 19/10

14:35-09:30

2 stops13h 55m

London City

Mon 26/10

07:45-22:23

2 stops18h 38m

£667

PortlandLondon

PWM - LGW

PWMLGW

Portland

Fri 3/7

09:52-10:00

1 stop19h 08m

London Gatwick

Fri 10/7

14:00-09:12

1 stop24h 12m

£776

Flights are sorted by cheapest return flights first.

Deals found on 22/5

Showing 1-10 of 33 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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

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

How much does it cost for a return flight from Portland, Maine to London?

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

Share of one-stop return flights from Portland, Maine to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Newark (EWR) – chosen by Cheapflights users on 33% of one-stop itineraries from Portland, Maine to London on Cheapflights.

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

Average return fare for one-stop flights from Portland, Maine to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

New York (JFK) is the most affordable one-stop option, with an average return flight price of £428.

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

Shortest average travel time for one-stop one-way flights from Portland, Maine to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Newark (EWR) have the shortest average one-way travel time for one-stop routes: 9h 40m.

Which airport typically offers the quickest stopover for flights from Portland, Maine to London?

Average stopover duration for one-stop one-way flights from Portland, Maine to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Newark (EWR) offer the fastest connection on this route, with an average stopover time of 1h 24m.

Related info for your journey

Find useful and relevant information for your journey from Portland to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • 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 28m. Fly via United Airlines, Delta, or American Airlines 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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How does Cheapflights help users find flights from Portland to London?

Cheapflights helps you search for flights from Portland to London via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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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