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Cheap flights from Portland, Maine to London Heathrow Airport from £164

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 22/4. Fares are subject to change and may not be available on all flights or dates of travel.
PWM — LHR
8 Feb — 15 Feb1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portland to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PWM) to Heathrow (LHR). 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 9 January 2026.

Round-trip from

£425

One-way from

£164

Popular in

December

Cheapest in

October

Average price

£582
Virgin Atlantic
  • Virgin Atlantic
  • 18/1-3/2
  • 3 total stops
  • 62h 47m total
  • Portland to London
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United Airlines
  • United Airlines
  • 22/4
  • 1 total stop
  • 10h 35m total
  • Portland to London
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Highest demand for flights based on searches. 3% potential increase in price (£19 potential increase over avg. return price).
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Cheapest flight prices on average. 4% potential price decrease (£25 potential savings vs. average return price).
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Average for round-trip flights in January 2026
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Find flight deals from Portland to Heathrow

Enter your travel dates to find the best prices.

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

Sun 18/105:30PWM - LHR
1 stop21h 20mVirgin Atlantic
Tue 3/210:00LHR - PWM
2 stops41h 27mVirgin Atlantic
Deal found 7/1£425
Sun 18/112:20PWM - LHR
2 stops18h 20mDelta
Tue 3/208:55LHR - PWM
2 stops20h 25mDelta
Deal found 7/1£451
Wed 18/306:00PWM - LHR
1 stop20h 30mMultiple Airlines
Wed 25/312:10LHR - PWM
1 stop15h 40mMultiple Airlines
Deal found 8/1£454
Wed 18/312:51PWM - LHR
2 stops16h 09mDelta
Wed 25/320:00LHR - PWM
2 stops20h 09mDelta
Deal found 8/1£457
Tue 31/314:30PWM - LHR
1 stop14h 45mDelta
Tue 14/409:55LHR - PWM
2 stops19h 51mDelta
Deal found 7/1£460
Tue 31/317:40PWM - LHR
1 stop12h 35mAmerican Airlines
Tue 14/409:45LHR - PWM
1 stop18h 25mAmerican Airlines
Deal found 7/1£465
Tue 31/316:48PWM - LHR
1 stop11h 07mKLM
Tue 14/411:45LHR - PWM
1 stop18h 01mKLM
Deal found 8/1£466
Thu 5/214:35PWM - LHR
1 stop11h 20mDelta
Thu 12/209:00LHR - PWM
2 stops20h 18mDelta
Deal found 7/1£466

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portland to Heathrow 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 January 2026.
Use the filters below to find and compare flights from Portland to London Heathrow Airport that are best for you.

Fly from

Portland

Fly to

Heathrow

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 18/3

06:00-06:30

1 stop20h 30m

London Heathrow

Wed 25/3

12:10-23:50

1 stop15h 40m

£454

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 31/3

14:30-10:15

1 stop14h 45m

London Heathrow

Tue 14/4

09:55-00:46

2 stops19h 51m

£460

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 31/3

17:40-11:15

1 stop12h 35m

London Heathrow

Tue 14/4

09:45-23:10

1 stop18h 25m

£465

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 31/3

16:48-08:55

1 stop11h 07m

London Heathrow

Tue 14/4

11:45-00:46

1 stop18h 01m

£466

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 20/2

12:13-08:45

1 stop15h 32m

London Heathrow

Fri 27/2

11:30-00:18

2 stops17h 48m

£467

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 6/3

14:35-06:20

1 stop10h 45m

London Heathrow

Tue 10/3

09:00-23:59

2 stops18h 59m

£467

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 21/2

05:45-05:55

1 stop19h 10m

London Heathrow

Sat 28/2

06:50-21:09

2 stops19h 19m

£469

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 20/2

16:15-11:15

1 stop14h 00m

London Heathrow

Fri 27/2

11:10-23:20

2 stops17h 10m

£469

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 6/2

14:31-06:40

1 stop11h 09m

London Heathrow

Fri 13/2

06:50-14:23

2 stops36h 33m

£469

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 22/4

06:00-21:35

1 stop10h 35m

£164

Flights are sorted by cheapest return flights first.

Deals found on 8/1

Showing 1-10 of 19 results
1
2

Best time to book a flight from Portland to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow 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 Heathrow Airport

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

Currently, October is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of £324). Flying from Portland, Maine to London Heathrow Airport in June is currently the most expensive (average of £441). 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.

Related info for your journey

Find useful and relevant information for your journey from Portland to Heathrow. 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 Heathrow?

    For a flight from Portland to London Heathrow, you will be flying from Portland. Portland (PWM) is just 2.9 mi from the center of the city. Portland is the only Portland airport and it handles 0 outbound flights to London Heathrow per day. 0 airlines have flights to London Heathrow from Portland on a regular basis.

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

    For as low as £460, Delta can have you in London Heathrow Airport from Portland, Maine in 14h 45m. The distance from Portland, Maine to London Heathrow Airport is about 3173 mi.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portland to Heathrow 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 Heathrow Airport?

    Currently, October is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of £324). Flying from Portland, Maine to London Heathrow Airport in June is currently the most expensive (average of £441). 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 London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Luton
Croydon
Northampton
Slough
Hounslow
Gatwick
Ilford
Wembley
Brentford
Hayes
Colchester
Watford
Crawley
Swindon
Kingston upon Thames
Bedford
Chelmsford
Eastbourne
Romford

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Alternative routes for Portland to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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Fly with Cheapflights

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

Deals for Portland to Heathrow flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

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

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 Portland to Heathrow.

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

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

Can Cheapflights notify me if prices for flights from Portland to Heathrow 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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