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Cheap flights from London to Portland, Maine from £539

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 31/10. Fares are subject to change and may not be available on all flights or dates of travel.
LON — PWM
15 Nov — 22 Nov1
1 adult
1 adult, Economy

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 16 October 2025.

Round-trip from

£551

One-way from

£539

Popular in

October

Cheapest in

September

Average price

£842
United Airlines
  • United Airlines
  • 11/12-16/12
  • 3 total stops
  • 31h 54m total
  • London to Portland
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31/10
  • 31/10
  • 3 total stops
  • 46h 55m total
  • London to Portland
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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 October 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 16 October 2025.

Thu 11/1206:35LHR - PWM
2 stops21h 34mUnited Airlines
Tue 16/1206:00PWM - LHR
1 stop10h 20mUnited Airlines
Deal found 16/10£551
Thu 13/1111:10LHR - PWM
2 stops17h 07mUnited Airlines
Fri 28/1115:20PWM - LHR
2 stops14h 55mUnited Airlines
Deal found 14/10£580
Thu 13/1108:00LHR - PWM
1 stop14h 48mAustrian Airlines
Fri 28/1110:45PWM - LHR
1 stop17h 25mAustrian Airlines
Deal found 14/10£592
Sun 30/1109:00LHR - PWM
2 stops43h 17mAir Canada
Sun 7/1206:00PWM - LHR
2 stops44h 10mAir Canada
Deal found 16/10£628
Thu 11/1206:30LHR - PWM
2 stops20h 53mVirgin Atlantic
Tue 16/1206:03PWM - LHR
2 stops23h 47mVirgin Atlantic
Deal found 16/10£637
Sun 30/1109:00LHR - PWM
2 stops43h 17mMultiple Airlines
Sun 7/1210:35PWM - LHR
1 stop17h 35mMultiple Airlines
Deal found 16/10£642
Fri 14/1110:00LHR - PWM
2 stops18h 54mDelta
Sat 22/1106:35PWM - LHR
1 stop19h 20mDelta
Deal found 15/10£664
Fri 14/1110:15LHR - PWM
1 stop12h 55mMultiple Airlines
Sat 22/1115:37PWM - LHR
1 stop11h 13mMultiple Airlines
Deal found 15/10£669
Fri 14/1113:25LHR - PWM
2 stops38h 52mAir Canada
Sat 22/1119:44PWM - LHR
2 stops30h 26mAir Canada
Deal found 15/10£673
Sat 29/1115:10LHR - PWM
1 stop13h 07mUnited Airlines
Sat 6/1206:00PWM - LHR
1 stop10h 20mUnited Airlines
Deal found 15/10£821

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 16 October 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

Thu 11/12

06:35-23:09

2 stops21h 34m

Portland

Tue 16/12

06:00-21:20

1 stop10h 20m

£551

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 13/11

11:10-23:59

2 stops17h 49m

Portland

Fri 28/11

19:44-11:05

1 stop10h 21m

£580

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sun 30/11

09:00-23:17

2 stops43h 17m

Portland

Sun 7/12

06:00-07:10

2 stops44h 10m

£628

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Thu 11/12

06:30-22:23

2 stops20h 53m

Portland

Tue 16/12

06:03-10:50

2 stops23h 47m

£637

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sun 30/11

09:00-23:17

2 stops43h 17m

Portland

Sun 7/12

10:35-09:10

1 stop17h 35m

£642

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 14/3

20:00-21:59

2 stops29h 59m

Portland

Thu 26/3

05:30-09:00

1 stop23h 30m

£655

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 14/11

10:00-23:54

2 stops18h 54m

Portland

Sat 22/11

06:35-06:55

1 stop19h 20m

£664

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 14/11

10:15-18:10

1 stop12h 55m

Portland

Sat 22/11

15:37-07:50

1 stop11h 13m

£669

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Fri 14/11

13:25-23:17

2 stops38h 52m

Portland

Sat 22/11

19:44-07:10

2 stops30h 26m

£673

LondonPortland

LHR - PWM

LHRPWM

London Heathrow

Sat 29/11

15:10-23:17

1 stop13h 07m

Portland

Sat 6/12

06:00-21:20

1 stop10h 20m

£821

Flights are sorted by cheapest return flights first.

Deals found on 14/10

Showing 1-10 of 12 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 £124). Flying from London to Portland, Maine in August is currently the most expensive (average of £364). 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 16 October 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 50% 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 £473.

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 50m.

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 16 October 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
1,402 reviews
Check prices

Overall

7.7

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Boarding

7.8

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
1,402 reviews
KLM
7.7
Good
1,402 reviews
Check prices

Overall

7.7

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Boarding

7.8

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
1,332 reviews
KLM
7.7
Good
1,402 reviews
Check prices

Overall

7.7

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Boarding

7.8

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
8,979 reviews
KLM
7.7
Good
1,402 reviews
Check prices

Overall

7.7

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Boarding

7.8

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
2,908 reviews
KLM
7.7
Good
1,402 reviews
Check prices

Overall

7.7

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Boarding

7.8

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
7,491 reviews
KLM
7.7
Good
1,402 reviews
Check prices

Overall

7.7

Food

7.2

Entertainment

7.1

Crew

8.4

Comfort

7.6

Boarding

7.8

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 6 different airlines.

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

    United Airlines, Air Canada, and Virgin Atlantic can get you from London to Portland, Maine in just under 20h 53m. Your travel time can differ by up to 22h 24m. 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 £385, 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 £400 and £473, respectively. Icelandair is 41% cheaper than the average price of flights available within the next 90 days to this destination.

  • 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 £124). Flying from London to Portland, Maine in August is currently the most expensive (average of £364). 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 6 airlines flying from London to Portland

Discover the top 6 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 16 October 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£385Average£594FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
JetBlueCheapest£400Average£544FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Virgin AtlanticCheapest£473Average£643FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£474Average£618FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£502Average£623FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£559Average£739FlexibilityNo 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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