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Cheap flights from Portland, Maine to London from £243

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 15/7. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LON
2 Aug — 9 Aug1
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 3 July 2026.

Sun 15/1115:43
PWM
-
LHR
1 stop11h 42m
United Airlines
Tue 17/1106:50
LHR
-
PWM
2 stops14h 19m
United Airlines
Deal found 2/7£554
Sun 23/806:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Thu 27/808:15
LHR
-
PWM
1 stop21h 10m
JetBlue
Deal found 2/7£617
Tue 25/813:25
PWM
-
LHR
1 stop15h 05m
JetBlue
Mon 31/808:15
LHR
-
PWM
1 stop33h 15m
JetBlue
Deal found 30/6£620
Tue 13/1006:00
PWM
-
LHR
1 stop9h 45m
JetBlue
Tue 3/1112:20
LHR
-
PWM
1 stop16h 23m
JetBlue
Deal found 29/6£620
Sun 1/1106:00
PWM
-
LHR
2 stops19h 30m
Multiple Airlines
Sun 8/1108:15
LHR
-
PWM
1 stop20h 28m
Multiple Airlines
Deal found 30/6£634
Sat 7/1117:09
PWM
-
LGW
2 stops34h 06m
Multiple Airlines
Sun 15/1112:35
LGW
-
PWM
1 stop25h 33m
Multiple Airlines
Deal found 29/6£638
Wed 19/814:40
PWM
-
LHR
1 stop13h 50m
JetBlue
Mon 24/808:15
LHR
-
PWM
1 stop33h 15m
JetBlue
Deal found 28/6£641
Sat 12/906:02
PWM
-
LHR
2 stops22h 33m
Scandinavian Airlines
Sat 19/906:40
LHR
-
PWM
2 stops22h 16m
Scandinavian Airlines
Deal found 1/7£642
Sat 15/806:41
PWM
-
LHR
1 stop9h 04m
JetBlue
Sat 22/811:55
LHR
-
PWM
1 stop17h 30m
JetBlue
Deal found 1/7£646
Tue 10/1110:48
PWM
-
LHR
1 stop14h 32m
United Airlines
Tue 24/1106:50
LHR
-
PWM
2 stops14h 19m
United Airlines
Deal found 30/6£647
Tue 10/1115:43
PWM
-
LHR
1 stop14h 22m
United Airlines
Tue 17/1106:50
LHR
-
PWM
2 stops16h 31m
United Airlines
Deal found 2/7£647
Wed 19/811:07
PWM
-
LGW
1 stop17h 53m
Multiple Airlines
Mon 24/814:00
LGW
-
PWM
2 stops36h 19m
Multiple Airlines
Deal found 28/6£689

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 3 July 2026.

Round-trip from

£554

One-way from

£243

Popular in

July

Cheapest in

December

Average price

£971
United Airlines
  • United Airlines
  • 15/11-17/11
  • 3 total stops
  • 26h 01m total
  • Portland to London
Search Deals
15/7
  • 15/7
  • 2 total stops
  • 34h 30m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 18% potential increase in price (£110 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£29 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 3 July 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
Fastest return journey

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 15/11

15:43-08:25

1 stop11h 42m

London Heathrow

Tue 17/11

06:50-16:09

2 stops14h 19m

£554

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 10/11

15:43-11:05

1 stop14h 22m

London Heathrow

Tue 17/11

06:50-18:21

2 stops16h 31m

£647

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 10/11

10:48-06:20

1 stop14h 32m

London Heathrow

Tue 24/11

06:50-16:09

2 stops14h 19m

£647

PortlandLondon

PWM - LCY

PWMLCY

Portland

Sun 1/11

12:52-07:15

2 stops13h 23m

London City

Sun 8/11

13:45-23:49

2 stops15h 04m

£716

PortlandLondon

PWM - LGW

PWMLGW

Portland

Sun 23/8

06:00-14:40

2 stops27h 40m

London Gatwick

Thu 27/8

13:00-00:25

2 stops16h 25m

£815

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 19/8

14:40-09:35

2 stops37h 55m

London Gatwick

Mon 24/8

12:20-13:45

2 stops54h 25m

£816

PortlandLondon

PWM - LGW

PWMLGW

Portland

Sat 12/9

06:00-09:55

2 stops46h 55m

London Gatwick

Sat 19/9

17:40-23:52

2 stops35h 12m

£834

PortlandLondon

PWM - LGW

PWMLGW

Portland

Sun 1/11

06:30-09:10

2 stops45h 40m

London Gatwick

Sun 8/11

10:05-23:43

2 stops42h 38m

£838

PortlandLondon

PWM - LGW

PWMLGW

Portland

Sun 1/11

06:30-20:35

3 stops33h 05m

London Gatwick

Sun 8/11

10:40-23:43

2 stops18h 03m

£938

PortlandLondon

PWM - LGW

PWMLGW

Portland

Sat 15/8

11:07-10:00

1 stop17h 53m

London Gatwick

Sat 22/8

14:00-22:39

2 stops37h 39m

£938

Flights are sorted by cheapest return flights first.

Deals found on 2/7

Showing 1-10 of 38 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

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 £432.

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 11h 42m. Fly via United Airlines, Delta, 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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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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