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Cheap flights from the United Kingdom to Portland, Maine from £405

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 28/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — PWM
8 Sep — 15 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from United Kingdom to Portland

Enter your travel dates to find the best prices.

Cheapest flights from United Kingdom to Portland
Explore the most affordable flight options available from United Kingdom to Portland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 9 August 2026.

Mon 21/908:15 -
1 stop20h 39m
Mon 28/906:00 -
1 stop22h 30m
Deal found 9/8£628
Wed 30/911:55 -
1 stop16h 59m
Sun 4/1006:00 -
1 stop9h 45m
Deal found 4/8£635
Tue 6/1011:55 -
1 stop16h 59m
Sat 17/1006:00 -
1 stop9h 45m
Deal found 8/8£636
Fri 11/908:15 -
1 stop20h 39m
Tue 15/906:00 -
1 stop9h 45m
Deal found 8/8£648
Thu 8/1011:55 -
1 stop16h 57m
Wed 14/1006:00 -
1 stop9h 45m
Deal found 8/8£661
Mon 21/911:20 -
2 stops17h 34m
Mon 28/906:00 -
2 stops30h 45m
Deal found 9/8£666
Tue 6/1008:00 -
2 stops20h 54m
Mon 12/1006:00 -
2 stops31h 50m
Deal found 5/8£674
Fri 9/1011:55 -
1 stop16h 57m
Sat 17/1006:00 -
1 stop9h 45m
Deal found 8/8£681
Tue 22/909:35 -
2 stops19h 21m
Tue 29/906:02 -
2 stops25h 03m
Deal found 8/8£682
Tue 6/1011:55 -
1 stop16h 59m
Tue 13/1006:00 -
1 stop9h 45m
Deal found 8/8£682
Thu 8/1011:55 -
1 stop16h 57m
Tue 13/1006:00 -
1 stop9h 45m
Deal found 8/8£691
Wed 7/1011:55 -
1 stop16h 59m
Sun 11/1006:00 -
1 stop9h 45m
Deal found 8/8£695

Find flight deals from United Kingdom to Portland

Keep the following information in mind while searching for United Kingdom to Portland flight deals. Data was last updated 9 August 2026.

Round-trip from

£628

One-way from

£405

Popular in

July

Cheapest in

December

Average price

£991
JetBlue
  • JetBlue
  • 25/9-29/9
  • 2 total stops
  • 39h 29m total
  • United Kingdom to Portland
Search Deals
JetBlue
  • JetBlue
  • 28/10
  • 1 total stop
  • 20h 18m total
  • United Kingdom to Portland
Search Deals
Highest demand for flights based on searches. 25% potential increase in price (£184 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£29 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from United Kingdom 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 9 August 2026.
Use the filters below to find and compare flights from the United Kingdom to Portland that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 21/9

11:20-23:54

2 stops17h 34m

Portland

Mon 28/9

06:00-17:45

2 stops30h 45m

£666

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Fri 9/10

11:55-23:52

1 stop16h 57m

Portland

Sat 17/10

06:00-20:45

1 stop9h 45m

£681

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Fri 9/10

11:55-23:52

1 stop16h 57m

Portland

Fri 16/10

06:00-20:45

1 stop9h 45m

£681

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 21/9

11:55-23:54

1 stop16h 59m

Portland

Mon 28/9

06:00-20:45

1 stop9h 45m

£711

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Tue 6/10

12:10-23:28

2 stops16h 18m

Portland

Mon 12/10

10:43-05:55

1 stop14h 12m

£721

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 30/9

07:30-18:12

2 stops15h 42m

Portland

Sun 4/10

18:55-07:15

1 stop31h 20m

£725

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Mon 21/9

07:45-18:29

1 stop15h 44m

Portland

Mon 28/9

10:43-10:25

1 stop18h 42m

£743
Fastest return journey

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Wed 7/10

16:00-23:28

1 stop12h 28m

Portland

Thu 15/10

10:43-05:55

1 stop14h 12m

£751

LondonPortland

LHR London Heathrow - PWM Portland

LHRPWM

London Heathrow

Thu 3/9

07:30-23:32

2 stops21h 02m

Portland

Mon 7/9

15:45-21:25

1 stop24h 40m

£756

ManchesterPortland

MAN Manchester - PWM Portland

MANPWM

Manchester

Mon 5/10

10:35-23:59

2 stops18h 24m

Portland

Wed 14/10

14:32-09:50

2 stops14h 18m

£798

Flights are sorted by cheapest return flights first.

Deals found on 8/8

Showing 1-10 of 30 resultsSorted by cheapest first
1
2
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Best time to book a flight from United Kingdom to Portland

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

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

Currently, December is the cheapest month in which you can book a flight from United Kingdom to Portland, Maine (average of £469). Flying from United Kingdom to Portland, Maine in July is currently the most expensive (average of £991). 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.

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 9 August 2026.
Get a feel of what it's like to fly with KLM and United Airlines from the United Kingdom 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
7.8
Good
1,555 reviews
Check prices

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Crew

8.4

Food

7.3

Overall

7.8

Reviews

1 / 20
4.0
Okay

Subhash,Jul 2026

CDG - ATL

The priority tag for bags were taken out. 1 bag is missing. Food was worst for AVML. The food was dry and burnt.
KLM
7.8
Good
1,555 reviews
KLM
7.8
Good
1,555 reviews
Check prices

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Crew

8.4

Food

7.3

Overall

7.8

Reviews

1 / 20
4.0
Okay

Subhash,Jul 2026

CDG - ATL

The priority tag for bags were taken out. 1 bag is missing. Food was worst for AVML. The food was dry and burnt.
United Airlines
7.4
Good
10,098 reviews
KLM
7.8
Good
1,555 reviews
Check prices

Entertainment

7.2

Comfort

7.7

Boarding

7.8

Crew

8.4

Food

7.3

Overall

7.8

Reviews

1 / 20
4.0
Okay

Subhash,Jul 2026

CDG - ATL

The priority tag for bags were taken out. 1 bag is missing. Food was worst for AVML. The food was dry and burnt.

Related info for your journey

Find useful and relevant information for your journey from United Kingdom 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 United Kingdom?

    If you book a flight to Portland from United Kingdom, 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.

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

    Airlines like JetBlue, United Airlines, and Delta fly from United Kingdom to Portland, Maine in about 16h 57m. The time it takes to get you to your destination can typically vary by up to 16h 06m. The distance between United Kingdom and Portland, Maine is about 3173 mi. This flight may include one or multiple stops.

  • What are the most popular routes from United Kingdom to Portland, Maine?

    While some choose either Manchester - Portland or Edinburgh Turnhouse - Portland, London Heathrow - Portland is the most popular route from United Kingdom to Portland, Maine.

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

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

  • How can I find direct flights from United Kingdom to Portland?

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

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

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

    Currently, December is the cheapest month in which you can book a flight from United Kingdom to Portland, Maine (average of £469). Flying from United Kingdom to Portland, Maine in July is currently the most expensive (average of £991). 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

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from United Kingdom to Portland

Discover the top airline that operate flights from United Kingdom 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 9 August 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest£548Average£764FlexibilityNo cancel feeOn-time75%
Search KLM flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from United Kingdom to Portland?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from United Kingdom to Portland. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from United Kingdom to Portland.

Can Cheapflights find flights from United Kingdom to Portland with no change fees?

Yes! Cheapflights helps users easily find flights from United Kingdom to Portland with no change fees.

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

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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