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Cheap flights from London to Portland, Maine from £527

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/12. Fares are subject to change and may not be available on all flights or dates of travel.
LON — PWM
7 Dec — 14 Dec1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to Portland

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to Portland (PWM). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 7 November 2025.

Round-trip from

£561

One-way from

£527

Popular in

October

Cheapest in

September

Average price

£600
United Airlines
  • United Airlines
  • 3/12-10/12
  • 3 total stops
  • 28h 18m total
  • London to Portland
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2/12
  • 2/12
  • 1 total stop
  • 14h 44m total
  • London to Portland
Search Deals
High demand for flights, 1% potential price rise
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Cheapest flight prices on average. 2% potential price decrease (£13 potential savings vs. average return price).
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Average for round-trip flights in November 2025
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Find flight deals from London to Portland

Enter your travel dates to find the best prices.

Cheapest flights from London to Portland
Explore the most affordable flight options available from London to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 November 2025.

Wed 3/1207:30LHR - PWM
2 stops16h 13mUnited Airlines
Wed 10/1215:20PWM - LHR
1 stop12h 05mUnited Airlines
Deal found 5/11£561
Wed 3/1212:00LHR - PWM
1 stop11h 43mAustrian Airlines
Wed 10/1210:35PWM - LHR
1 stop29h 45mAustrian Airlines
Deal found 5/11£571
Wed 3/1211:10LHR - PWM
2 stops16h 59mAir Canada
Wed 10/1206:00PWM - LHR
2 stops19h 30mAir Canada
Deal found 5/11£577
Thu 6/1116:10LHR - PWM
1 stop12h 55mKLM
Wed 12/1114:30PWM - LHR
1 stop12h 35mKLM
Deal found 5/11£863
Wed 3/1206:40LHR - PWM
2 stops22h 19mScandinavian Airlines
Wed 10/1214:34PWM - LHR
3 stops20h 51mScandinavian Airlines
Deal found 5/11£864
Thu 6/1116:10LHR - PWM
1 stop12h 55mAir France
Wed 12/1114:30PWM - LHR
2 stops16h 10mAir France
Deal found 5/11£894
Thu 6/1109:20LHR - PWM
2 stops59h 30mIcelandair
Wed 12/1116:45PWM - LHR
2 stops23h 55mIcelandair
Deal found 5/11£943
Sun 21/1214:45LHR - PWM
1 stop13h 06mMultiple Airlines
Sun 28/1207:17PWM - LHR
1 stop20h 58mMultiple Airlines
Deal found 5/11£1,062
Sun 21/1212:50LHR - PWM
2 stops16h 09mUnited Airlines
Sun 28/1205:30PWM - LHR
1 stop20h 10mUnited Airlines
Deal found 5/11£1,094
Sat 20/1215:10LHR - PWM
1 stop13h 12mUnited Airlines
Sat 27/1205:30PWM - LHR
1 stop20h 10mUnited Airlines
Deal found 5/11£1,132

Cheapflights Fare Finder

 
Customise your flight search to find flights from London to Portland that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 7 November 2025.
Use the filters below to find and compare flights from London to Portland that are best for you.

Fly from

London

Fly to

Portland

Route

Depart

Return

Price

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Wed 3/12

07:30-18:43

2 stops16h 13m

Portland

Wed 10/12

15:20-08:25

1 stop12h 05m

£561

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Wed 3/12

11:10-23:09

2 stops16h 59m

Portland

Wed 10/12

06:00-06:30

2 stops19h 30m

£577

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 13/1

12:05-23:30

2 stops16h 25m

Portland

Sun 18/1

16:10-07:55

1 stop34h 45m

£589

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 13/1

10:10-00:20

1 stop19h 10m

Portland

Sun 18/1

14:35-20:10

1 stop24h 35m

£626

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 13/1

06:40-00:20

3 stops22h 40m

Portland

Sun 18/1

06:00-09:20

2 stops22h 20m

£677

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 13/1

18:00-13:56

3 stops24h 56m

Portland

Sun 18/1

08:35-07:10

3 stops17h 35m

£813

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Wed 3/12

06:40-23:59

2 stops22h 19m

Portland

Wed 10/12

14:34-16:25

3 stops20h 51m

£864

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 28/3

09:10-18:13

1 stop13h 03m

Portland

Tue 31/3

11:17-07:15

1 stop14h 58m

£880

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 28/3

08:00-19:36

2 stops15h 36m

Portland

Tue 31/3

06:00-21:35

1 stop10h 35m

£880

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Tue 2/12

12:15-10:36

2 stops27h 21m

£527

Flights are sorted by cheapest return flights first.

Deals found on 4/11

Showing 1-10 of 14 results
1
2

Best time to book a flight from London to Portland

Have a flexible travel schedule? Discover the best time to fly to Portland from London 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 London to Portland

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

Currently, January is the cheapest month in which you can book a flight from London to Portland, Maine (average of £127). Flying from London to Portland, Maine in August is currently the most expensive (average of £371). 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 is the cheapest time of day to fly from LON to PWM?

Find hourly flight availability from London to Portland. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 7 November 2025.

It’s typically best to fly out from London to Portland, Maine in the evening. Doing so could potentially save you 39% on the flight price compared to flying at midday, which is usually more expensive.

How much does it cost for a return flight from London to Portland, Maine?

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

Share of one-stop return flights from London to Portland, Maine chosen by Cheapflights users in the past 12 months, using the same stopover each way.

New York (JFK) – chosen by Cheapflights users on 49% of one-stop itineraries from London to Portland, Maine on Cheapflights.

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

Average return fare for one-stop flights from London to Portland, Maine, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Chicago (ORD) is the most affordable one-stop option, with an average return flight price of £483.

What’s the fastest stopover option from London to Portland, Maine?

Shortest average travel time for one-stop one-way flights from London to Portland, Maine, 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: 11h 45m.

Which airport typically offers the quickest stopover for flights from London to Portland, Maine?

Average stopover duration for one-stop one-way flights from London to Portland, Maine, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Chicago (ORD) offer the fastest connection on this route, with an average stopover time of 1h 10m.

Reviews of airlines servicing Portland

Get insights into the airlines that provide service to Portland. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portland. Reviews last updated 7 November 2025.
Get a feel of what it's like to fly with KLM, Finnair, andUnited Airlines from London to Portland by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.7
Good
1,405 reviews
Check prices

Comfort

7.7

Overall

7.7

Entertainment

7.1

Food

7.3

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
KLM
7.7
Good
1,405 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Comfort

7.7

Overall

7.7

Entertainment

7.1

Food

7.3

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Finnair
7.6
Good
1,335 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Comfort

7.7

Overall

7.7

Entertainment

7.1

Food

7.3

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
United Airlines
7.4
Good
9,007 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Comfort

7.7

Overall

7.7

Entertainment

7.1

Food

7.3

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
JetBlue
7.2
Good
2,907 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Comfort

7.7

Overall

7.7

Entertainment

7.1

Food

7.3

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.
Lufthansa
6.8
Okay
7,558 reviews
KLM
7.7
Good
1,405 reviews
Check prices

Comfort

7.7

Overall

7.7

Entertainment

7.1

Food

7.3

Boarding

7.8

Crew

8.4

Reviews

1 / 20
2.0
Mediocre

Abisola,Oct 2025

LOS - CDG

The food option was finished and what wa left was vegan pasta so I had to go without food for an 8 hour flight without any sort of empathy from crew that was mean.

Related info for your journey

Find useful and relevant information for your journey from London to Portland. 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 into for flights to Portland from London?

    If you book a flight to Portland from London, you will be flying to Portland, which is the city’s only airport. Portland (PWM) is located 2.9 mi from the center of Portland. There are 0 flights from London to Portland per day from 7 different airlines.

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

    United Airlines, Air Canada, and Delta can get you from London to Portland, Maine in just under 16h 13m. Your travel time can differ by up to 2h 57m. The distance between London and Portland, Maine is about 3173 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What are the cheapest airlines flying from London to Portland, Maine round-trip?

    Currently priced at £393, Icelandair will fly you from London to Portland, Maine and back. In addition to Icelandair, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from JetBlue and Virgin Atlantic - these airlines can fly you to your destination from £409 and £483, respectively. Icelandair is 41% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from London to Portland, Maine one-way?

    The cheapet airlines for a one-way flight from London to Portland, Maine are Air Canada (£619), KLM (£816), and Austrian Airlines (£1,057).

  • Can I find deals for flights from London to Portland that include hotel bookings?

    Yes. In addition to deals on London to Portland flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to Portland?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Portland.

  • Can I find deals for business class flights from London to Portland?

    Yes. Cheapflights offers flight deals from London to Portland 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 London to Portland, Maine?

    Currently, January is the cheapest month in which you can book a flight from London to Portland, Maine (average of £127). Flying from London to Portland, Maine in August is currently the most expensive (average of £371). 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

Travelling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
Bath

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Top 7 airlines flying from London to Portland

Discover the top 7 airlines that operate flights from London to Portland. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 7 November 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£393Average£606FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
JetBlueCheapest£409Average£541FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Virgin AtlanticCheapest£483Average£634FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£484Average£631FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£513Average£636FlexibilityNo cancel feeOn-time75%
Search KLM flights
LufthansaCheapest£525Average£944FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£570Average£754FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

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How does Cheapflights help users find flights from London to Portland?

When you search for this flight from London to Portland, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from London to Portland?

Cheapflights helps you find that perfect flight to Portland from London 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 London to Portland with no change fees?

Need flexible booking options for your flight to Portland from London? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from London to Portland become cheaper?

Of course! You can now track prices for flights from London to Portland and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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