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Cheap flights from Portland, Maine to London from £190

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 25/7. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LON
8 Jul — 15 Jul1
1 adult

Cheap flight deals from Portland to London

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to London (LON). 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 3 July 2025.

Round-trip from

£480

One-way from

£190

Popular in

July

Cheapest in

October

Average price

£919
Scandinavian Airlines
  • Scandinavian Airlines
  • 1/10-15/10
  • 4 total stops
  • 50h 18m total
  • Portland to London
25/7
  • 25/7
  • 1 total stop
  • 34h 55m total
  • Portland to London
Highest demand for flights based on searches. 22% potential increase in price (£130 potential increase over avg. return price).
Cheapest flight prices on average. 4% potential price decrease (£20 potential savings vs. average return price).
Average for round-trip flights in July 2025

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 3 July 2025.

Wed 1/1006:33PWM - LHR
2 stops28h 52mScandinavian Airlines
Wed 15/1007:05LHR - PWM
2 stops21h 26mScandinavian Airlines
Deal found 2/7£480
Wed 24/914:17PWM - LHR
1 stop14h 13mJetBlue
Thu 2/1011:55LHR - PWM
1 stop15h 07mJetBlue
Deal found 2/7£482
Tue 12/814:36PWM - LGW
1 stop14h 24mDelta
Wed 20/812:00LGW - PWM
1 stop17h 48mDelta
Deal found 3/7£519
Wed 1/1014:25PWM - LHR
1 stop15h 15mUnited Airlines
Wed 15/1017:40LHR - PWM
2 stops28h 15mUnited Airlines
Deal found 2/7£534
Tue 12/814:36PWM - LHR
1 stop14h 24mDelta
Wed 20/809:00LHR - PWM
2 stops20h 48mDelta
Deal found 2/7£545
Sun 17/806:00PWM - LHR
1 stop20h 15mVirgin Atlantic
Sun 24/811:20LHR - PWM
1 stop17h 43mVirgin Atlantic
Deal found 3/7£561
Sat 1/1106:00PWM - LHR
2 stops34h 35mAir Canada
Thu 13/1109:00LHR - PWM
2 stops43h 17mAir Canada
Deal found 1/7£571
Wed 24/914:21PWM - LGW
2 stops19h 19mMultiple Airlines
Thu 2/1014:00LGW - PWM
1 stop24h 06mMultiple Airlines
Deal found 2/7£572
Fri 14/1112:50PWM - LCY
2 stops15h 40mDelta
Tue 18/1108:40LCY - PWM
2 stops19h 51mDelta
Deal found 2/7£643
Tue 23/907:09PWM - LGW
2 stops21h 46mTurkish Airlines
Tue 30/914:00LGW - PWM
2 stops37h 01mTurkish Airlines
Deal found 2/7£668
Sun 17/814:08PWM - LCY
2 stops17h 22mMultiple Airlines
Sun 24/819:20LCY - PWM
2 stops29h 09mMultiple Airlines
Deal found 3/7£855
Tue 12/814:19PWM - LGW
2 stops20h 16mTAP AIR PORTUGAL
Wed 20/810:35LGW - PWM
2 stops18h 42mTAP AIR PORTUGAL
Deal found 3/7£881

Cheapflights Fare Finder

Customise your flight search to find flights from Portland to London 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 3 July 2025.
Use the filters below to find and compare flights from Portland to London that are best for you.

Fly from

Portland

Fly to

London

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 1/10

06:33-16:25

2 stops28h 52m

London Heathrow

Wed 15/10

07:05-23:31

2 stops21h 26m

£480

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 24/9

14:17-09:30

1 stop14h 13m

London Heathrow

Thu 2/10

11:55-22:02

1 stop15h 07m

£482

PortlandLondon

PWM - LGW

PWMLGW

Portland

Tue 12/8

14:36-10:00

1 stop14h 24m

London Gatwick

Wed 20/8

12:00-00:48

1 stop17h 48m

£519

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 1/10

14:25-10:40

1 stop15h 15m

London Heathrow

Wed 15/10

17:40-16:55

2 stops28h 15m

£534

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 12/8

14:36-10:00

1 stop14h 24m

London Heathrow

Wed 20/8

09:00-00:48

2 stops20h 48m

£545

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 23/9

14:41-08:50

1 stop13h 09m

London Heathrow

Tue 30/9

13:05-00:11

1 stop16h 06m

£551

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 17/8

06:00-07:15

1 stop20h 15m

London Heathrow

Sun 24/8

11:20-00:03

1 stop17h 43m

£561

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 1/11

06:00-20:35

2 stops34h 35m

London Heathrow

Thu 13/11

09:00-23:17

2 stops43h 17m

£571

PortlandLondon

PWM - LGW

PWMLGW

Portland

Wed 24/9

14:21-14:40

2 stops19h 19m

London Gatwick

Thu 2/10

14:00-09:06

1 stop24h 06m

£572

PortlandLondon

PWM - LCY

PWMLCY

Portland

Fri 14/11

12:50-09:30

2 stops15h 40m

London City

Tue 18/11

08:40-23:31

2 stops19h 51m

£643

Flights are sorted by cheapest return flights first.

Deals found on 3/7

Showing 1-10 of 22 results
1
2
3

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.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. 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 London. Reviews last updated 3 July 2025.
See what other customers who have flown with Delta, KLM, andUnited Airlines from Portland to London have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
8.0
Very Good

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Boarding

8.2

Food

7.3

Entertainment

7.9

Overall

8.0

Comfort

7.9

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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?

    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.

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

    Cheapflights users have booked flights from Portland, Maine to London round-trip from £480. Other airlines that can offer you cheap pricing are JetBlue, from £482, and Delta, from £519. Scandinavian Airlines is currently priced 23% below the average price you’ll pay for this route.

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

    £325 is the cheapest one-way deal found within the past few days, from JetBlue. You may also be able to find cheap deals on Air Canada and Delta, with prices starting from £376 and £379, respectively.

  • 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?

    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

Travelling to a place near Portland?

Book flights to Portland if you plan to visit one of these locations
Hounslow
Croydon
Milton Keynes
Deal
Gatwick
Luton
Slough
Wembley
Crawley
Eastbourne
Ilford
Hayes
Folkestone
Southend-on-Sea
Watford
Ipswich
Winchester
Maidstone
Guildford
Chichester

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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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