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

There are many flights that can get you from Portland, Maine to London in 12h 15m. Fly via United Airlines, Delta, or Turkish Airlines to get the fastest option. The distance between Portland, Maine and London is about 3193 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 6 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£641

Tue 13/1015:41 -

2 stops13h 34m

Wed 21/1013:50 -

2 stops14h 38m

Deal found 3/9£647

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

Tue 10/1108:49 -

3 stops18h 41m

Tue 17/1106:00 -

3 stops22h 21m

Deal found 4/9£655

Tue 10/1108:49 -

3 stops18h 41m

Tue 24/1106:00 -

3 stops22h 21m

Deal found 2/9£656

Mon 16/1106:30 -

1 stop10h 10m

Wed 18/1112:20 -

1 stop16h 23m

Deal found 3/9£664

Mon 19/1015:41 -

2 stops13h 59m

Mon 26/1011:10 -

2 stops16h 11m

Deal found 4/9£666

Mon 19/1007:00 -

2 stops22h 00m

Thu 22/1014:00 -

1 stop24h 08m

Deal found 2/9£681

Sat 3/1005:30 -

2 stops20h 20m

Sat 10/1010:45 -

2 stops17h 51m

Deal found 3/9£693

Wed 23/911:50 -

2 stops15h 05m

Wed 21/1009:20 -

2 stops19h 50m

Deal found 3/9£707

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 6 September 2026.

Tue 20/1011:35 -

1 stop14h 10m

Tue 27/1006:50 -

2 stops16h 12m

Deal found 5/9£641

Fri 16/1016:15 -

2 stops12h 15m

Fri 23/1009:20 -

2 stops19h 50m

Deal found 1/9£707

Sun 4/1007:00 -

2 stops46h 00m

Sun 11/1014:00 -

1 stop24h 08m

Deal found 4/9£720

Mon 19/1006:00 -

2 stops29h 40m

Mon 26/1010:05 -

2 stops41h 38m

Deal found 4/9£726

Wed 23/1213:20 -

2 stops12h 55m

Fri 1/109:35 -

2 stops17h 05m

Deal found 5/9£1,150

Tue 10/1115:41 -

1 stop13h 44m

Tue 17/1106:50 -

2 stops21h 31m

Deal found 5/9£641

Tue 10/1114:05 -

1 stop11h 35m

Tue 24/1106:50 -

2 stops17h 12m

Deal found 4/9£641

Wed 23/911:50 -

2 stops15h 05m

Wed 21/1009:20 -

2 stops19h 50m

Deal found 3/9£707

Fri 16/1017:35 -

2 stops35h 25m

Fri 23/1014:00 -

1 stop24h 08m

Deal found 1/9£723

Tue 13/1006:00 -

2 stops35h 25m

Wed 21/1007:25 -

2 stops45h 29m

Deal found 2/9£782

Mon 19/1016:15 -

2 stops12h 15m

Mon 26/1009:20 -

2 stops18h 50m

Deal found 5/9£746

Mon 12/1016:15 -

2 stops12h 15m

Wed 28/1008:40 -

2 stops19h 30m

Deal found 2/9£747

Fri 30/1017:30 -

2 stops13h 25m

Sun 1/1111:55 -

2 stops16h 55m

Deal found 5/9£826

Wed 23/906:00 -

2 stops22h 55m

Wed 21/1007:25 -

2 stops45h 29m

Deal found 3/9£892

Thu 8/1006:00 -

2 stops46h 55m

Tue 13/1017:35 -

2 stops35h 19m

Deal found 4/9£914

Sun 4/1006:00 -

2 stops46h 55m

Sun 11/1007:30 -

2 stops45h 24m

Deal found 4/9£914

Wed 23/1213:20 -

2 stops12h 55m

Sat 2/108:40 -

2 stops19h 20m

Deal found 5/9£1,239

Tue 22/1213:20 -

2 stops12h 55m

Sat 2/108:40 -

2 stops19h 20m

Deal found 5/9£1,239

Thu 8/1012:42 -

2 stops15h 48m

Tue 13/1009:20 -

2 stops19h 15m

Deal found 3/9£3,225

Sun 20/906:00 -

2 stops21h 35m

Thu 24/909:10 -

2 stops19h 44m

Deal found 3/9£7,508

Mon 23/1116:03 -

2 stops12h 27m

Sun 29/1113:45 -

2 stops15h 34m

Deal found 5/9£8,594

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 (£23 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

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

£260

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

Thu 8/10

06:00-15:00

2 stops28h 00m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£358

PortlandLondon

PWM Portland - LCY London City

PWMLCY

Portland

Thu 8/10

06:00-08:40

2 stops21h 40m

London City

Wed 31/12

00:00-18:00

Nonstop0h 00m

£369

PortlandLondon

PWM Portland - SEN London Southend

PWMSEN

Portland

Thu 8/10

12:35-08:40

3 stops39h 05m

London Southend

Wed 31/12

00:00-18:00

Nonstop0h 00m

£428

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 20/10

11:35-06:45

1 stop14h 10m

London Heathrow

Tue 27/10

06:50-19:02

2 stops16h 12m

£641

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

£641

Flights are sorted by cheapest return flights first.

Deals found on 1/9

Showing 1-10 of 34 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 12h 15m. Fly via United Airlines, Delta, or Turkish Airlines to get the fastest option. The distance between Portland, Maine and London is about 3193 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

Hounslow

Milton Keynes

Luton

Gatwick

Wembley

Slough

Ilford

Hayes

Croydon

Colchester

Eastbourne

Brentford

Barnet

Southall

Southend-on-Sea

Enfield

Kingston upon Thames

Watford

Dover

Ipswich

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

Direct flights to England

Flights by cabin class

London flight routes

Other flight options

Popular flights

Alternative routes for Portland to London

Boston to Heathrow flights

Boston to London City flights

Boston to Stansted flights

Boston to Gatwick flights

Boston to Luton flights

Boston to Edinburgh flights

Boston to Manchester flights

Boston to Birmingham flights

Boston to Southampton flights

Boston to Leeds flights

Boston to Liverpool flights

Boston to Bristol flights

Boston to Newcastle upon Tyne flights

Boston to Southend flights

Bangor to Heathrow flights

Portland to Heathrow flights

Portland to Manchester flights

Boston to East Midlands flights

Boston to Doncaster flights

Fly with Cheapflights

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

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 6 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 6 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 6 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 6 September 2026.

Last-minute flights from Portland to LondonDiscover last-minute flight deals from Portland to London. Data last updated 6 September 2026 and is based on user searches.

Discover last-minute flight deals from Portland to London. Data last updated 6 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 6 September 2026.

Search for one-way flight options from Portland to London. Find affordable one-way fares based on user searches. Data last updated 6 September 2026.

Find flight deals from Portland to London

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

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?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portland to London

See prices for flight routes from nearby airports that may be better suited for you.

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

Book a non-stop flight to one of these other cities located in England.

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 6 September 2026.

Portland and London flights

Browse other Portland and London flight options. Last updated on 6 September 2026.

Popular flight searches

Check out other popular destinations found by fellow travellers in 2026

Fly with Cheapflights

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?

100% Free

Book with Flexibility

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 6 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 6 September 2026.

Last-minute flights from Portland to London
Discover last-minute flight deals from Portland to London. Data last updated 6 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 6 September 2026.