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 25m. Fly via Delta, Virgin Atlantic, 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?

A simple way to save on the total cost of your ticket is to fly from Portland, Maine to London at midday. If you’re flexible enough to do this you can expect to save up to 6% on your trip compared to booking a flight in the morning.

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.

£384+ Cheap Flights from Portland, Maine to London

Cheap flight deals from Portland to London

Round-trip from	£384
Popular in	July
Cheapest in	October
Average price	£579

Delta
12/11-19/11
3 total stops
30h 49m total
Portland to London

Search Deals

Highest demand for flights based on searches. 16% potential increase in price (£92 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).

Search Deals

Average for round-trip flights in September 2025

Search Deals

Find flight deals from Portland to London

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 17 September 2025.

Wed 12/1113:25PWM - LHR

1 stop13h 25mDelta

Wed 19/1111:30LHR - PWM

2 stops17h 24mDelta

Deal found 15/9£384

Tue 11/1114:30PWM - LHR

1 stop10h 50mDelta

Thu 20/1111:45LHR - PWM

2 stops17h 09mDelta

Deal found 15/9£385

Wed 24/917:00PWM - LHR

2 stops15h 30mDelta

Tue 30/909:00LHR - PWM

2 stops20h 34mDelta

Deal found 15/9£387

Tue 11/1112:48PWM - LHR

2 stops15h 32mDelta

Wed 19/1111:30LHR - PWM

2 stops17h 24mDelta

Deal found 15/9£388

Tue 11/1116:53PWM - LHR

1 stop10h 52mKLM

Thu 20/1108:55LHR - PWM

1 stop18h 24mKLM

Deal found 15/9£390

Wed 12/1113:25PWM - LHR

2 stops16h 20mVirgin Atlantic

Thu 20/1106:20LHR - PWM

2 stops20h 59mVirgin Atlantic

Deal found 15/9£408

Wed 15/1014:38PWM - LHR

2 stops15h 07mDelta

Fri 24/1006:30LHR - PWM

2 stops22h 35mDelta

Deal found 14/9£408

Thu 30/1013:27PWM - LHR

1 stop12h 58mDelta

Thu 6/1106:20LHR - PWM

2 stops22h 45mDelta

Deal found 15/9£421

Thu 13/1113:25PWM - LHR

1 stop13h 25mKLM

Fri 21/1108:55LHR - PWM

1 stop18h 24mKLM

Deal found 15/9£427

Tue 11/1114:30PWM - LCY

2 stops12h 40mDelta

Fri 21/1109:20LCY - PWM

2 stops19h 34mDelta

Deal found 15/9£427

Wed 8/1012:45PWM - LHR

2 stops15h 05mDelta

Sun 12/1012:55LHR - PWM

1 stop16h 10mDelta

Deal found 15/9£430

Fri 14/1106:35PWM - LCY

2 stops21h 55mDelta

Tue 18/1110:00LCY - PWM

2 stops18h 54mDelta

Deal found 16/9£464

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 17 September 2025.

Wed 12/1113:25PWM - LHR

1 stop13h 25mDelta

Wed 19/1111:30LHR - PWM

2 stops17h 24mDelta

Deal found 15/9£384

Wed 12/1113:25PWM - LHR

1 stop13h 25mVirgin Atlantic

Thu 20/1109:00LHR - PWM

2 stops18h 19mVirgin Atlantic

Deal found 15/9£384

Tue 11/1116:53PWM - LHR

1 stop10h 52mKLM

Thu 20/1108:55LHR - PWM

1 stop18h 24mKLM

Deal found 15/9£390

Wed 12/1114:30PWM - LHR

1 stop12h 35mMultiple Airlines

Wed 19/1112:30LHR - PWM

1 stop14h 49mMultiple Airlines

Deal found 15/9£390

Wed 8/1007:09PWM - LGW

2 stops24h 51mTurkish Airlines

Sun 12/1005:20LGW - PWM

2 stops22h 44mTurkish Airlines

Deal found 15/9£699

Tue 11/1114:30PWM - LHR

1 stop14h 05mDelta

Wed 19/1108:55LHR - PWM

2 stops18h 24mDelta

Deal found 15/9£384

Tue 21/1014:38PWM - LHR

1 stop13h 12mKLM

Wed 29/1012:30LHR - PWM

1 stop13h 49mKLM

Deal found 16/9£390

Tue 11/1114:30PWM - LHR

1 stop10h 50mDelta

Thu 20/1111:45LHR - PWM

2 stops17h 09mDelta

Deal found 15/9£385

Tue 11/1116:53PWM - LHR

1 stop10h 52mKLM

Fri 21/1108:55LHR - PWM

1 stop18h 24mKLM

Deal found 15/9£390

Wed 12/1114:30PWM - LHR

1 stop12h 35mDelta

Fri 21/1111:45LHR - PWM

2 stops17h 09mDelta

Deal found 15/9£385

Wed 15/1014:38PWM - LHR

1 stop15h 47mDelta

Fri 24/1006:30LHR - PWM

2 stops22h 35mDelta

Deal found 14/9£385

Tue 11/1112:48PWM - LHR

2 stops15h 32mDelta

Fri 21/1111:45LHR - PWM

2 stops17h 09mDelta

Deal found 15/9£389

Fri 14/1109:54PWM - LCY

2 stops20h 46mMultiple Airlines

Mon 17/1119:10LCY - PWM

2 stops27h 38mMultiple Airlines

Deal found 15/9£607

Mon 17/1109:46PWM - LGW

1 stop19h 14mMultiple Airlines

Fri 21/1114:00LGW - PWM

1 stop25h 36mMultiple Airlines

Deal found 14/9£623

Wed 12/1114:30PWM - LCY

2 stops11h 45mDelta

Fri 21/1109:20LCY - PWM

2 stops19h 34mDelta

Deal found 15/9£427

Fri 26/907:09PWM - LGW

2 stops21h 46mTurkish Airlines

Fri 10/1014:00LGW - PWM

2 stops38h 04mTurkish Airlines

Deal found 16/9£700

Tue 11/1114:30PWM - LCY

2 stops12h 40mDelta

Fri 21/1109:20LCY - PWM

2 stops19h 34mDelta

Deal found 15/9£427

Tue 11/1112:48PWM - LCY

2 stops13h 27mDelta

Wed 19/1110:00LCY - PWM

2 stops18h 54mDelta

Deal found 15/9£427

Mon 10/1109:46PWM - LGW

1 stop19h 14mMultiple Airlines

Fri 14/1114:00LGW - PWM

1 stop25h 36mMultiple Airlines

Deal found 14/9£689

Tue 11/1114:30PWM - LCY

2 stops13h 20mDelta

Thu 20/1110:00LCY - PWM

2 stops18h 54mDelta

Deal found 15/9£427

Wed 15/1007:09PWM - LGW

2 stops24h 51mTurkish Airlines

Sun 19/1017:15LGW - PWM

2 stops25h 07mTurkish Airlines

Deal found 16/9£846

Mon 13/1014:34PWM - LCY

2 stops20h 51mMultiple Airlines

Mon 20/1008:45LCY - PWM

3 stops19h 28mMultiple Airlines

Deal found 15/9£711

Wed 12/1114:30PWM - LCY

2 stops12h 40mDelta

Wed 19/1109:20LCY - PWM

2 stops19h 34mDelta

Deal found 15/9£427

Mon 13/1009:46PWM - LGW

1 stop19h 14mMultiple Airlines

Mon 20/1013:05LGW - PWM

2 stops50h 31mMultiple Airlines

Deal found 15/9£741

Wed 12/1114:30PWM - LCY

2 stops12h 40mDelta

Thu 20/1110:00LCY - PWM

2 stops18h 54mDelta

Deal found 15/9£427

Wed 8/1011:16PWM - LGW

1 stop17h 44mMultiple Airlines

Sun 12/1014:00LGW - PWM

1 stop24h 06mMultiple Airlines

Deal found 15/9£768

Fri 14/1106:35PWM - LCY

2 stops21h 55mDelta

Tue 18/1110:00LCY - PWM

2 stops18h 54mDelta

Deal found 16/9£464

Thu 5/314:50PWM - LGW

2 stops15h 05mMultiple Airlines

Sat 21/311:55LGW - PWM

2 stops16h 15mMultiple Airlines

Deal found 14/9£821

Wed 12/1115:30PWM - LGW

2 stops14h 25mMultiple Airlines

Thu 20/1111:55LGW - PWM

2 stops15h 20mMultiple Airlines

Deal found 15/9£836

Mon 13/1014:38PWM - LCY

2 stops12h 32mDelta

Mon 20/1008:40LCY - PWM

2 stops20h 25mDelta

Deal found 15/9£644

Last-minute flights from Portland to London
Discover last-minute flight deals from Portland to London. Data last updated 17 September 2025 and is based on user searches.

Wed 24/914:41PWM - LHR

1 stop14h 19mDelta

Tue 30/909:00LHR - PWM

2 stops20h 34mDelta

Deal found 15/9£384

Wed 24/913:35PWM - LHR

1 stop12h 10mKLM

Tue 30/916:05LHR - PWM

1 stop13h 29mKLM

Deal found 15/9£390

Fri 26/913:35PWM - LHR

1 stop12h 10mKLM

Fri 10/1016:05LHR - PWM

1 stop13h 00mKLM

Deal found 16/9£427

Fri 26/912:40PWM - LHR

2 stops14h 00mDelta

Fri 10/1016:50LHR - PWM

1 stop12h 15mDelta

Deal found 16/9£450

Fri 26/907:09PWM - LGW

2 stops21h 46mTurkish Airlines

Fri 10/1014:00LGW - PWM

2 stops38h 04mTurkish Airlines

Deal found 16/9£700

Wed 8/1012:45PWM - LHR

2 stops15h 05mDelta

Sun 12/1012:55LHR - PWM

1 stop16h 10mDelta

Deal found 15/9£430

Wed 8/1007:09PWM - LGW

2 stops24h 51mTurkish Airlines

Sun 12/1005:20LGW - PWM

2 stops22h 44mTurkish Airlines

Deal found 15/9£699

Mon 13/1006:50PWM - LHR

1 stop18h 35mDelta

Mon 20/1008:40LHR - PWM

2 stops20h 25mDelta

Deal found 15/9£451

Mon 13/1014:38PWM - LCY

2 stops12h 32mDelta

Mon 20/1008:40LCY - PWM

2 stops20h 25mDelta

Deal found 15/9£644

Wed 15/1014:38PWM - LHR

1 stop15h 47mDelta

Fri 24/1006:30LHR - PWM

2 stops22h 35mDelta

Deal found 14/9£385

Wed 15/1014:38PWM - LHR

1 stop13h 12mKLM

Fri 24/1016:05LHR - PWM

1 stop13h 00mKLM

Deal found 14/9£494

Thu 30/1013:27PWM - LHR

1 stop12h 58mDelta

Thu 6/1106:20LHR - PWM

2 stops22h 45mDelta

Deal found 15/9£421

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 12/11

13:25-07:50

1 stop13h 25m

London Heathrow

Wed 19/11

11:30-23:54

2 stops17h 24m

£384

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 12/11

13:25-07:50

1 stop13h 25m

London Heathrow

Thu 20/11

09:00-22:19

2 stops18h 19m

£384

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/11

14:30-09:35

1 stop14h 05m

London Heathrow

Wed 19/11

08:55-22:19

2 stops18h 24m

£384

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/11

14:30-06:20

1 stop10h 50m

London Heathrow

Thu 20/11

11:45-23:54

2 stops17h 09m

£385

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 12/11

14:30-08:05

1 stop12h 35m

London Heathrow

Fri 21/11

11:45-23:54

2 stops17h 09m

£385

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 15/10

14:38-11:25

1 stop15h 47m

London Heathrow

Fri 24/10

06:30-00:05

2 stops22h 35m

£385

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/11

12:48-09:20

2 stops15h 32m

London Heathrow

Fri 21/11

11:45-23:54

2 stops17h 09m

£389

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/11

16:53-08:45

1 stop10h 52m

London Heathrow

Thu 20/11

08:55-22:19

1 stop18h 24m

£390

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 12/11

14:30-08:05

1 stop12h 35m

London Heathrow

Wed 19/11

12:30-22:19

1 stop14h 49m

£390

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 21/10

14:38-08:50

1 stop13h 12m

London Heathrow

Wed 29/10

12:30-22:19

1 stop13h 49m

£390

Flights are sorted by cheapest return flights first.

Deals found on 16/9

Showing 1-10 of 31 results

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.

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

What is the cheapest month to book a flight from Portland, Maine to London?

Currently, January is the cheapest month in which you can book a flight from Portland, Maine to London (average of £112). Flying from Portland, Maine to London in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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

Newark (EWR) – chosen by Cheapflights users on 43% of one-stop itineraries from Portland, Maine to London on Cheapflights.

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

Newark (EWR) is the most affordable one-stop option, with an average return flight price of £535.

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 35m.

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 35m.

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 25m. Fly via Delta, Virgin Atlantic, 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.
What is the cheapest month to book a flight from Portland, Maine to London?
Currently, January is the cheapest month in which you can book a flight from Portland, Maine to London (average of £112). Flying from Portland, Maine to London in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Croydon

Hounslow

Slough

Gatwick

Luton

Deal

Wembley

Ilford

Crawley

Hayes

Watford

Winchester

Chichester

Ipswich

Dartford

Guildford

Brentford

Bishop's Stortford

Romford

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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 £384

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 24/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Portland to London

Round-trip from

Popular in

Cheapest in

Average price

Find 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 17 September 2025.

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 17 September 2025.

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

Everything you need to know about your flight from Portland to London

What is the cheapest month to book a flight from Portland, Maine to London?

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.

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.

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.

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.

Related info for your journey

Find useful and relevant information for your journey from Portland to London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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?

What is the cheapest month to book a flight from Portland, Maine to London?

Travelling to a place near London?

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Alternative routes for Portland 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 17 September 2025.