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 44m. 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.

£237+ 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 4 September 2026.

Tue 10/1114:05 -

1 stop11h 35m

Tue 24/1106:50 -

2 stops17h 12m

Deal found 4/9£641

Tue 10/1115:41 -

1 stop13h 44m

Tue 17/1106:50 -

2 stops21h 31m

Deal found 2/9£642

Sun 27/906:00 -

1 stop9h 45m

Sun 4/1008:15 -

1 stop20h 39m

Deal found 30/8£647

Tue 13/1015:41 -

2 stops13h 34m

Wed 21/1013:50 -

2 stops14h 38m

Deal found 3/9£648

Sun 4/1006:00 -

1 stop9h 45m

Sun 11/1008:15 -

1 stop20h 39m

Deal found 4/9£648

Tue 10/1106:30 -

1 stop10h 10m

Tue 17/1112:20 -

1 stop16h 23m

Deal found 2/9£649

Wed 23/906:00 -

1 stop9h 45m

Sat 3/1008:15 -

1 stop20h 39m

Deal found 31/8£650

Sun 15/1106:30 -

1 stop22h 00m

Wed 18/1112:20 -

1 stop16h 23m

Deal found 31/8£654

Tue 10/1108:49 -

3 stops18h 41m

Tue 17/1106:00 -

3 stops22h 21m

Deal found 4/9£656

Tue 10/1108:49 -

3 stops18h 41m

Tue 24/1106:00 -

3 stops22h 21m

Deal found 2/9£657

Mon 19/1007:00 -

2 stops22h 00m

Thu 22/1014:00 -

1 stop24h 08m

Deal found 2/9£682

Sat 3/1005:30 -

2 stops20h 20m

Sat 10/1010:45 -

2 stops17h 51m

Deal found 3/9£694

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 4 September 2026.

Tue 10/1115:41 -

1 stop13h 44m

Tue 17/1106:50 -

2 stops21h 31m

Deal found 4/9£641

Wed 23/911:50 -

2 stops15h 05m

Wed 21/1009:20 -

2 stops19h 50m

Deal found 3/9£708

Sun 27/907:00 -

2 stops46h 00m

Sun 4/1014:00 -

1 stop24h 08m

Deal found 30/8£714

Mon 19/1006:00 -

2 stops29h 40m

Mon 26/1010:05 -

2 stops41h 38m

Deal found 4/9£726

Tue 10/1114:05 -

1 stop11h 35m

Tue 24/1106:50 -

2 stops17h 12m

Deal found 2/9£642

Sun 4/1016:20 -

2 stops12h 10m

Sun 11/1013:45 -

2 stops15h 25m

Deal found 4/9£708

Sun 4/1007:00 -

2 stops46h 00m

Sun 11/1014:00 -

1 stop24h 08m

Deal found 4/9£721

Fri 9/1016:15 -

2 stops12h 15m

Tue 13/1010:00 -

2 stops19h 10m

Deal found 1/9£708

Tue 13/1006:00 -

2 stops35h 25m

Wed 21/1007:25 -

2 stops45h 29m

Deal found 2/9£782

Fri 16/1009:48 -

1 stop19h 12m

Fri 23/1014:00 -

1 stop24h 08m

Deal found 1/9£751

Thu 15/1006:00 -

2 stops29h 35m

Thu 22/1007:30 -

2 stops45h 24m

Deal found 31/8£787

Mon 19/1016:15 -

2 stops12h 15m

Mon 26/1009:20 -

2 stops18h 50m

Deal found 4/9£747

Thu 15/1007:00 -

2 stops46h 00m

Thu 22/1014:00 -

1 stop24h 08m

Deal found 31/8£759

Mon 12/1016:15 -

2 stops12h 15m

Wed 28/1008:40 -

2 stops19h 30m

Deal found 2/9£748

Wed 23/906:00 -

2 stops22h 55m

Wed 21/1007:25 -

2 stops45h 29m

Deal found 3/9£893

Wed 23/911:08 -

1 stop17h 52m

Sat 3/1014:00 -

2 stops37h 19m

Deal found 31/8£812

Wed 23/911:50 -

2 stops15h 05m

Sat 3/1008:25 -

2 stops20h 31m

Deal found 31/8£784

Thu 8/1006:00 -

2 stops21h 40m

Tue 13/1009:15 -

2 stops19h 39m

Deal found 1/9£891

Sun 22/1116:50 -

2 stops17h 55m

Sun 29/1110:00 -

2 stops19h 19m

Deal found 30/8£833

Thu 8/1012:42 -

2 stops15h 48m

Tue 13/1009:20 -

2 stops19h 15m

Deal found 2/9£3,227

Sun 27/911:50 -

2 stops16h 40m

Sun 4/1013:45 -

2 stops15h 11m

Deal found 30/8£6,528

Thu 24/911:50 -

2 stops16h 00m

Sat 3/1008:25 -

2 stops20h 31m

Deal found 31/8£6,898

Find flight deals from Portland to London

Round-trip from	£641
One-way from	£237
Popular in	July
Cheapest in	December
Average price	£568

United Airlines
10/11-17/11
3 total stops
35h 15m total
Portland to London

Search Deals

JetBlue
8/10-31/12
1 total stop
9h 45m 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 (£24 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2026

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 8/10

06:00-20:45

1 stop9h 45m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£237

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 3/10

17:08-11:55

1 stop13h 47m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£252

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 19/10

06:00-09:30

1 stop22h 30m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£252

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 8/10

06:00-09:35

2 stops22h 35m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£258

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sat 3/10

09:10-06:30

3 stops16h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£261

PortlandLondon

PWM Portland - LGW London Gatwick

PWMLGW

Portland

Mon 19/10

07:00-10:00

3 stops46h 00m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£271

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 19/10

11:35-06:55

2 stops14h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£343

PortlandLondon

PWM Portland - LGW London Gatwick

PWMLGW

Portland

Thu 8/10

07:00-10:00

2 stops46h 00m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£346

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 19/10

08:03-06:30

3 stops17h 27m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£349

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 8/10

06:00-15:00

2 stops28h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£358

Flights are sorted by cheapest return flights first.

Deals found on 1/9

Showing 1-10 of 35 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-LCY

PWM-LGW

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-LCY

PWM-LGW

PWM-SEN

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 £426.

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 44m. 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 £237

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/10. 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 4 September 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 4 September 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 4 September 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 4 September 2026.

Last-minute flights from Portland to LondonDiscover last-minute flight deals from Portland to London. Data last updated 4 September 2026 and is based on user searches.

Discover last-minute flight deals from Portland to London. Data last updated 4 September 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 4 September 2026.

Search for one-way flight options from Portland to London. Find affordable one-way fares based on user searches. Data last updated 4 September 2026.

Find flight deals from Portland to London

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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

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 £426.

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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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 4 September 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 4 September 2026.

Last-minute flights from Portland to London
Discover last-minute flight deals from Portland to London. Data last updated 4 September 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 4 September 2026.