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 55m. Fly via Delta to get the fastest option. The distance between Portland, Maine and London is about 3173 mi.

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 15 September 2026.

Tue 10/1106:00 -

1 stop19h 25m

Tue 24/1108:55 -

2 stops20h 24m

Deal found 11/9£548

Wed 4/1116:15 -

1 stop13h 15m

Thu 12/1111:45 -

2 stops17h 34m

Deal found 11/9£549

Tue 10/1116:50 -

2 stops13h 50m

Tue 17/1106:30 -

2 stops22h 49m

Deal found 14/9£551

Wed 7/1016:47 -

2 stops14h 18m

Wed 14/1008:55 -

2 stops20h 15m

Deal found 13/9£552

Mon 16/1108:49 -

1 stop19h 21m

Wed 18/1106:50 -

2 stops21h 31m

Deal found 14/9£553

Tue 10/1114:05 -

1 stop13h 55m

Tue 17/1115:50 -

1 stop13h 29m

Deal found 10/9£553

Mon 5/1011:50 -

2 stops14h 50m

Tue 20/1011:45 -

2 stops17h 25m

Deal found 10/9£571

Thu 5/1106:01 -

1 stop19h 24m

Tue 10/1106:20 -

2 stops22h 11m

Deal found 15/9£584

Fri 9/1006:04 -

1 stop20h 11m

Wed 14/1011:30 -

2 stops17h 40m

Deal found 15/9£585

Fri 6/1116:15 -

2 stops18h 30m

Wed 11/1110:00 -

2 stops19h 19m

Deal found 15/9£599

Mon 26/1006:30 -

2 stops22h 40m

Mon 2/1106:30 -

2 stops22h 13m

Deal found 10/9£724

Mon 5/1009:48 -

1 stop19h 12m

Tue 20/1014:00 -

1 stop24h 08m

Deal found 10/9£749

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 15 September 2026.

Tue 10/1114:05 -

1 stop13h 55m

Tue 24/1108:55 -

2 stops20h 24m

Deal found 10/9£548

Mon 16/1110:50 -

1 stop29h 30m

Wed 18/1112:05 -

2 stops16h 16m

Deal found 10/9£570

Thu 5/1114:09 -

1 stop16h 31m

Tue 10/1108:55 -

1 stop19h 36m

Deal found 15/9£590

Mon 26/1006:30 -

2 stops22h 40m

Mon 2/1106:30 -

2 stops22h 13m

Deal found 10/9£724

Mon 12/1006:00 -

2 stops22h 55m

Mon 19/1007:05 -

2 stops45h 49m

Deal found 12/9£857

Tue 10/1112:45 -

1 stop13h 05m

Tue 17/1106:30 -

2 stops22h 49m

Deal found 10/9£548

Wed 7/1016:47 -

2 stops14h 18m

Wed 14/1008:55 -

2 stops20h 15m

Deal found 13/9£552

Mon 5/1016:20 -

1 stop11h 30m

Tue 20/1011:20 -

1 stop17h 50m

Deal found 10/9£553

Thu 29/1006:30 -

2 stops29h 20m

Thu 5/1110:40 -

2 stops18h 03m

Deal found 14/9£773

Mon 12/1016:15 -

1 stop14h 50m

Mon 19/1009:55 -

2 stops19h 15m

Deal found 12/9£585

Fri 6/1112:42 -

2 stops17h 58m

Wed 11/1108:40 -

2 stops19h 51m

Deal found 15/9£588

Fri 9/1006:00 -

2 stops46h 55m

Fri 16/1007:25 -

2 stops45h 29m

Deal found 11/9£866

Mon 5/1006:00 -

2 stops33h 00m

Tue 20/1020:40 -

2 stops32h 14m

Deal found 10/9£852

Fri 6/1116:15 -

2 stops18h 30m

Wed 11/1110:00 -

2 stops19h 19m

Deal found 15/9£599

Sun 11/1006:00 -

2 stops35h 25m

Wed 14/1007:25 -

2 stops45h 29m

Deal found 12/9£924

Sat 26/911:08 -

1 stop17h 52m

Sun 4/1014:00 -

1 stop24h 08m

Deal found 14/9£900

Thu 5/1118:47 -

2 stops14h 03m

Tue 10/1106:50 -

2 stops16h 27m

Deal found 15/9£1,021

Thu 8/1011:55 -

2 stops15h 00m

Tue 13/1010:00 -

2 stops19h 10m

Deal found 13/9£793

Thu 5/1118:47 -

2 stops14h 03m

Wed 11/1106:50 -

2 stops16h 27m

Deal found 11/9£1,021

Thu 8/1011:55 -

2 stops16h 30m

Tue 13/1010:35 -

2 stops18h 35m

Deal found 13/9£811

Sun 27/911:50 -

2 stops16h 35m

Sat 3/1010:25 -

2 stops18h 31m

Deal found 14/9£884

Sun 27/911:50 -

2 stops15h 05m

Sat 3/1008:25 -

2 stops20h 31m

Deal found 14/9£898

Thu 29/1012:42 -

2 stops16h 48m

Thu 5/1107:45 -

2 stops18h 15m

Deal found 14/9£912

Fri 6/1111:55 -

2 stops15h 15m

Wed 11/1109:20 -

2 stops19h 11m

Deal found 15/9£912

Mon 26/1014:09 -

2 stops14h 41m

Mon 2/1107:45 -

2 stops18h 15m

Deal found 10/9£923

Mon 12/1011:55 -

2 stops15h 00m

Mon 19/1009:20 -

2 stops19h 50m

Deal found 12/9£1,041

Wed 4/1116:47 -

2 stops18h 48m

Mon 9/1108:40 -

2 stops19h 51m

Deal found 15/9£1,068

Mon 5/1012:55 -

2 stops14h 00m

Tue 20/1010:00 -

2 stops19h 10m

Deal found 10/9£1,114

Thu 1/1012:55 -

2 stops15h 35m

Wed 7/1010:00 -

2 stops19h 10m

Deal found 11/9£2,934

Find flight deals from Portland to London

Round-trip from	£548
One-way from	£237
Popular in	July
Cheapest in	December
Average price	£556

Delta
10/11-24/11
3 total stops
39h 49m total
Portland to London

Search Deals

JetBlue
5/11-31/12
1 total stop
10h 10m total
Portland to London

Search Deals

Highest demand for flights based on searches. 16% potential increase in price (£94 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

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 5/11

06:30-21:40

1 stop10h 10m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£237

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 4/11

06:30-21:40

1 stop10h 10m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£244

Fastest return journey

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 16/10

06:00-20:45

1 stop9h 45m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£244

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 14/2

06:00-06:20

1 stop19h 20m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£245

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Sun 14/2

10:57-07:00

2 stops15h 03m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£245

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 6/11

06:28-06:20

1 stop18h 52m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£247

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Thu 5/11

05:50-05:55

2 stops19h 05m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£247

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Fri 16/10

06:04-05:20

2 stops18h 16m

London Heathrow

Wed 31/12

00:00-18:00

Nonstop0h 00m

£247

PortlandLondon

PWM Portland - LGW London Gatwick

PWMLGW

Portland

Thu 5/11

11:55-09:00

2 stops16h 05m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£251

PortlandLondon

PWM Portland - LGW London Gatwick

PWMLGW

Portland

Wed 4/11

16:15-15:45

2 stops18h 30m

London Gatwick

Wed 31/12

00:00-18:00

Nonstop0h 00m

£251

Flights are sorted by cheapest return flights first.

Deals found on 11/9

Showing 1-10 of 52 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

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 13h 55m. Fly via Delta to get the fastest option. The distance between Portland, Maine and London is about 3173 mi.
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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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 5/11. 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 15 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 15 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 15 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 15 September 2026.

Last-minute flights from Portland to LondonDiscover last-minute flight deals from Portland to London. Data last updated 15 September 2026 and is based on user searches.

Discover last-minute flight deals from Portland to London. Data last updated 15 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 15 September 2026.

Search for one-way flight options from Portland to London. Find affordable one-way fares based on user searches. Data last updated 15 September 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

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 15 September 2026.

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Browse other Portland and London flight options. Last updated on 15 September 2026.

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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 15 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 15 September 2026.

Last-minute flights from Portland to London
Discover last-minute flight deals from Portland to London. Data last updated 15 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 15 September 2026.