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

There are many flights that can get you from Portland, Maine to London in 13h 45m. Fly via United Airlines, Delta, or Turkish 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.

In terms of precipitation, rainfall in London ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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.

What is the cheapest time of day to fly from PWM to LON?

When flying from Portland, Maine to London, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

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.

£245+ Cheap Flights from Portland, Maine to London

Cheap flight deals from Portland to London

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

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 19 August 2026.

Tue 10/1114:15 -

1 stop13h 45m

Tue 24/1106:30 -

2 stops22h 03m

Deal found 14/8£640

Tue 10/1114:05 -

2 stops14h 05m

Tue 24/1106:50 -

2 stops17h 12m

Deal found 17/8£643

Tue 10/1112:50 -

2 stops15h 10m

Tue 17/1108:40 -

2 stops20h 15m

Deal found 14/8£643

Mon 28/915:41 -

1 stop10h 34m

Mon 5/1017:55 -

2 stops29h 17m

Deal found 14/8£649

Tue 15/906:00 -

1 stop9h 45m

Mon 21/908:15 -

1 stop20h 39m

Deal found 15/8£652

Mon 21/906:00 -

1 stop9h 45m

Sat 26/911:55 -

1 stop16h 59m

Deal found 17/8£655

Mon 14/906:00 -

1 stop9h 45m

Mon 21/911:55 -

1 stop16h 59m

Deal found 17/8£659

Tue 10/1106:30 -

1 stop22h 00m

Fri 13/1112:20 -

1 stop16h 23m

Deal found 17/8£660

Fri 9/1016:15 -

2 stops12h 15m

Thu 15/1010:00 -

2 stops19h 10m

Deal found 18/8£684

Tue 25/814:53 -

2 stops37h 32m

Sat 5/910:25 -

2 stops19h 34m

Deal found 18/8£694

Tue 25/814:53 -

2 stops37h 32m

Tue 8/910:35 -

2 stops42h 21m

Deal found 18/8£699

Sun 6/911:50 -

2 stops16h 00m

Tue 22/910:00 -

2 stops18h 28m

Deal found 17/8£706

Best flights from Portland to London
Discover carefully curated flight deals from Portland to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 19 August 2026.

Mon 8/215:15 -

2 stops15h 45m

Wed 10/206:50 -

2 stops21h 07m

Deal found 15/8£560

Tue 10/1114:15 -

1 stop13h 45m

Tue 24/1106:30 -

2 stops22h 03m

Deal found 15/8£640

Thu 8/1006:00 -

2 stops35h 25m

Tue 13/1017:35 -

2 stops35h 17m

Deal found 17/8£720

Wed 23/911:08 -

1 stop17h 52m

Tue 6/1012:40 -

2 stops15h 38m

Deal found 15/8£796

Tue 10/1115:41 -

1 stop13h 44m

Tue 17/1106:50 -

2 stops21h 31m

Deal found 15/8£640

Tue 10/1112:50 -

2 stops17h 50m

Tue 17/1106:30 -

2 stops22h 25m

Deal found 18/8£643

Tue 10/1114:05 -

2 stops14h 05m

Tue 24/1106:50 -

2 stops17h 12m

Deal found 15/8£643

Wed 23/916:20 -

2 stops16h 25m

Tue 6/1009:55 -

2 stops19h 15m

Deal found 15/8£643

Wed 23/906:00 -

2 stops35h 30m

Tue 6/1017:35 -

2 stops35h 19m

Deal found 15/8£799

Fri 9/1016:15 -

2 stops12h 15m

Thu 15/1010:00 -

2 stops19h 10m

Deal found 18/8£684

Sun 8/1116:47 -

2 stops35h 58m

Sun 6/1212:35 -

1 stop25h 33m

Deal found 18/8£830

Wed 16/906:00 -

2 stops21h 25m

Tue 22/909:25 -

2 stops19h 29m

Deal found 17/8£869

Wed 16/916:20 -

2 stops12h 10m

Tue 22/910:00 -

2 stops18h 28m

Deal found 17/8£745

Thu 8/1006:00 -

2 stops21h 40m

Tue 13/1009:15 -

2 stops19h 37m

Deal found 17/8£874

Thu 3/914:53 -

2 stops13h 32m

Thu 10/910:25 -

2 stops18h 04m

Deal found 18/8£769

Thu 3/914:53 -

2 stops13h 32m

Wed 9/910:25 -

2 stops18h 04m

Deal found 18/8£769

Tue 15/906:00 -

2 stops29h 35m

Mon 21/907:05 -

2 stops21h 49m

Deal found 15/8£957

Sun 1/1109:46 -

2 stops27h 04m

Fri 6/1116:40 -

3 stops31h 22m

Deal found 14/8£1,009

Fri 4/911:50 -

2 stops16h 35m

Mon 7/910:25 -

2 stops17h 48m

Deal found 15/8£892

Sun 1/1119:30 -

2 stops17h 10m

Fri 6/1109:50 -

2 stops19h 09m

Deal found 14/8£1,015

Sun 1/1116:47 -

2 stops17h 58m

Fri 6/1110:00 -

2 stops19h 10m

Deal found 14/8£986

Mon 21/911:50 -

2 stops15h 05m

Sat 26/908:25 -

2 stops20h 31m

Deal found 17/8£1,269

Thu 3/911:50 -

2 stops15h 05m

Thu 10/909:20 -

2 stops19h 36m

Deal found 18/8£1,460

Fri 4/912:47 -

2 stops14h 08m

Mon 7/909:20 -

2 stops18h 53m

Deal found 15/8£1,909

Tue 8/911:50 -

2 stops16h 40m

Sat 12/908:25 -

2 stops20h 31m

Deal found 16/8£2,542

Wed 16/906:00 -

3 stops47h 55m

Tue 22/907:05 -

3 stops45h 49m

Deal found 17/8£9,638

Wed 23/906:00 -

3 stops47h 55m

Tue 6/1006:55 -

3 stops45h 59m

Deal found 15/8£9,638

Tue 15/906:00 -

3 stops47h 50m

Mon 21/907:05 -

3 stops45h 49m

Deal found 15/8£9,638

Find flight deals from Portland to London

Round-trip from	£557
One-way from	£245
Popular in	July
Cheapest in	December
Average price	£551

United Airlines
8/2-10/2
3 total stops
38h 00m total
Portland to London

Search Deals

JetBlue
11/11
1 total stop
22h 00m total
Portland to London

Search Deals

Highest demand for flights based on searches. 16% potential increase in price (£93 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£23 potential savings vs. average return price).

Search Deals

Average for round-trip flights in August 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 8/2

15:15-12:00

2 stops15h 45m

London Heathrow

Wed 10/2

06:50-22:57

2 stops21h 07m

£560

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 10/11

14:15-09:00

1 stop13h 45m

London Heathrow

Tue 24/11

06:30-23:33

2 stops22h 03m

£640

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 10/11

15:41-10:25

1 stop13h 44m

London Heathrow

Tue 17/11

06:50-23:21

2 stops21h 31m

£640

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 10/11

14:05-09:10

2 stops14h 05m

London Heathrow

Tue 24/11

06:50-19:02

2 stops17h 12m

£643

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 10/11

12:50-11:40

2 stops17h 50m

London Heathrow

Tue 17/11

06:30-23:55

2 stops22h 25m

£643

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 23/9

16:20-13:45

2 stops16h 25m

London Heathrow

Tue 6/10

09:55-00:10

2 stops19h 15m

£643

PortlandLondon

PWM Portland - LCY London City

PWMLCY

Portland

Fri 9/10

16:15-09:30

2 stops12h 15m

London City

Thu 15/10

10:00-00:10

2 stops19h 10m

£684

PortlandLondon

PWM Portland - LGW London Gatwick

PWMLGW

Portland

Thu 8/10

06:00-22:25

2 stops35h 25m

London Gatwick

Tue 13/10

17:35-23:52

2 stops35h 17m

£720

Fastest return journey

PortlandLondon

PWM Portland - LCY London City

PWMLCY

Portland

Wed 16/9

16:20-09:30

2 stops12h 10m

London City

Tue 22/9

10:00-23:28

2 stops18h 28m

£745

PortlandLondon

PWM Portland - LGW London Gatwick

PWMLGW

Portland

Thu 3/9

14:53-09:25

2 stops13h 32m

London Gatwick

Thu 10/9

10:25-23:29

2 stops18h 04m

£769

Flights are sorted by cheapest return flights first.

Deals found on 17/8

Showing 1-10 of 53 resultsSorted by cheapest first

...

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.

PWM-LON

PWM-LHR

PWM-LGW

PWM-LCY

PWM-SEN

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

PWM-LON

PWM-LHR

PWM-LGW

PWM-LCY

PWM-SEN

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

Airfare is typical for this route at the moment.

Portland, Maine to London flights typically cost between £528 and £640 in February.
The cheapest return price found within the last 5 days was £557 on United Airlines (8 Feb–10 Feb).

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

Newark (EWR) – chosen by Cheapflights users on 50% of one-stop itineraries from Portland, Maine to London on Cheapflights.

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

New York (JFK) is the most affordable one-stop option, with an average return flight price of £425.

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

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?

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

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 13h 45m. Fly via United Airlines, Delta, or Turkish 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.

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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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Cheap flights from Portland, Maine to London from £245

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 11/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Portland to London

Cheapest flights from Portland to LondonExplore 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 19 August 2026.

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 19 August 2026.

Best flights from Portland to LondonDiscover carefully curated flight deals from Portland to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 19 August 2026.

Discover carefully curated flight deals from Portland to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 19 August 2026.

Last-minute flights from Portland to LondonDiscover last-minute flight deals from Portland to London. Data last updated 19 August 2026 and is based on user searches.

Discover last-minute flight deals from Portland to London. Data last updated 19 August 2026 and is based on user searches.

One-way flights from Portland to LondonSearch for one-way flight options from Portland to London. Find affordable one-way fares based on user searches. Data last updated 19 August 2026.

Search for one-way flight options from Portland to London. Find affordable one-way fares based on user searches. Data last updated 19 August 2026.

Find flight deals from Portland to London

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One-way from

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

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.

Cheapflights Insights

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

Airfare is typical for this route at the moment.

Portland, Maine to London flights typically cost between £528 and £640 in February.The cheapest return price found within the last 5 days was £557 on United Airlines (8 Feb–10 Feb).

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 50% 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 £425.

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

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

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

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

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

How can I find direct flights from Portland to London?

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

Travelling to a place near London?

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Search flights from Portland to London by cabin class

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Other flights to London

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How does Cheapflights help users find flights from Portland to London?

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

Can Cheapflights find flights from Portland to London with no change fees?

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

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Travel Smart

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 19 August 2026.

Best flights from Portland to London
Discover carefully curated flight deals from Portland to London that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 19 August 2026.

Last-minute flights from Portland to London
Discover last-minute flight deals from Portland to London. Data last updated 19 August 2026 and is based on user searches.

One-way flights from Portland to London
Search for one-way flight options from Portland to London. Find affordable one-way fares based on user searches. Data last updated 19 August 2026.

Portland, Maine to London flights typically cost between £528 and £640 in February.
The cheapest return price found within the last 5 days was £557 on United Airlines (8 Feb–10 Feb).