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

There are many flights that can get you from Portland, Maine to London in 14h 11m. Fly via United Airlines or Delta 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.

£246+ 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 10 November 2026.

Thu 12/1106:30 -

1 stop10h 10m

Wed 18/1112:20 -

1 stop16h 23m

Deal found 5/11£630

Tue 1/1206:00 -

2 stops34h 00m

Wed 9/1209:00 -

2 stops41h 12m

Deal found 9/11£635

Tue 1/1212:49 -

1 stop13h 56m

Wed 9/1211:45 -

2 stops17h 36m

Deal found 9/11£643

Thu 12/1105:50 -

1 stop9h 45m

Wed 18/1109:00 -

2 stops19h 21m

Deal found 5/11£653

Sat 5/1206:00 -

1 stop19h 20m

Sat 12/1212:05 -

2 stops16h 19m

Deal found 7/11£653

Fri 4/1216:00 -

1 stop10h 15m

Fri 11/1210:00 -

2 stops18h 52m

Deal found 6/11£654

Sun 15/1105:50 -

2 stops20h 20m

Thu 19/1109:00 -

2 stops19h 21m

Deal found 8/11£656

Tue 17/1114:05 -

2 stops14h 05m

Mon 23/1112:05 -

2 stops16h 16m

Deal found 8/11£657

Fri 4/1212:49 -

2 stops16h 41m

Tue 8/1210:00 -

2 stops18h 33m

Deal found 9/11£658

Thu 12/1108:49 -

2 stops31h 11m

Wed 18/1113:00 -

2 stops39h 21m

Deal found 5/11£661

Tue 8/1206:00 -

1 stop10h 20m

Fri 11/1213:00 -

2 stops35h 25m

Deal found 6/11£662

Sun 15/1109:46 -

2 stops16h 24m

Thu 19/1109:00 -

3 stops19h 21m

Deal found 8/11£662

Find flight deals from Portland to London

Round-trip from	£569
One-way from	£246
Popular in	July
Cheapest in	February
Average price	£644

United Airlines
23/2-25/2
3 total stops
35h 46m total
Portland to London

Search Deals

United Airlines
31/3-31/12
1 total stop
10h 25m 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

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 31/3

06:00-21:25

1 stop10h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£246

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 10/3

06:00-06:25

1 stop19h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£249

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 23/11

14:05-09:00

1 stop13h 55m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£259

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 23/11

05:30-05:55

2 stops19h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£259

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 27/11

08:49-06:30

3 stops16h 41m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£263

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 1/1

06:00-10:00

1 stop23h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£268

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 16/4

16:50-13:15

2 stops15h 25m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£333

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 23/2

15:14-10:25

1 stop14h 11m

London Heathrow

Thu 25/2

06:50-23:25

2 stops21h 35m

£569

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 4/12

12:49-10:30

2 stops16h 41m

London Heathrow

Fri 11/12

08:40-00:21

2 stops20h 41m

£658

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 8/12

06:00-21:20

1 stop10h 20m

London Heathrow

Fri 11/12

13:00-19:25

2 stops35h 25m

£662

Flights are sorted by cheapest return flights first.

Deals found on 5/11

Showing 1-10 of 17 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

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

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 14h 11m. Fly via United Airlines or Delta 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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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 £246

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 31/3. 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 10 November 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 10 November 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 10 November 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 10 November 2026.

Last-minute flights from Portland to LondonDiscover last-minute flight deals from Portland to London. Data last updated 10 November 2026 and is based on user searches.

Discover last-minute flight deals from Portland to London. Data last updated 10 November 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 10 November 2026.

Search for one-way flight options from Portland to London. Find affordable one-way fares based on user searches. Data last updated 10 November 2026.

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Best time to book a flight from Portland to London

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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?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Portland to London

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Complete your trip

Complete your trip to London by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to England

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Search flights from Portland to London by cabin class

Find flights from Portland to London, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Other flights to London

Explore flights to London departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 10 November 2026.

Portland and London flights

Browse other Portland and London flight options. Last updated on 10 November 2026.

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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 10 November 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 10 November 2026.

Last-minute flights from Portland to London
Discover last-minute flight deals from Portland to London. Data last updated 10 November 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 10 November 2026.