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

Flying on Scandinavian Airlines is currently your cheapest option to London Heathrow Airport, with prices starting at £478. Additional return tickets that might be worth considering are offered by JetBlue and United Airlines, with the lowest prices starting at £511 and £531, respectively. Users have found that Scandinavian Airlines is 30% cheaper than the other options available to this destination.

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

£295 is the cheapest one-way deal found within the past few days, from KLM. You may also be able to find cheap deals on JetBlue and TAP AIR PORTUGAL, with prices starting from £323 and £397, respectively.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

What is the cheapest month to fly from Portland, Maine to London Heathrow Airport?

Flights from Portland, Maine to London Heathrow Airport lean towards being more expensive in July. Prices are generally better when you fly from Portland, Maine to London Heathrow Airport in October, with the cheapest ticket starting at £437.

What is the cheapest time of day to fly from PWM to LHR?

When flying from Portland, Maine to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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.

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.

£239+ Flights from Portland, Maine to London Heathrow Airport

Cheap flight deals from Portland to Heathrow

Round-trip from	£478
One-way from	£295
Popular in	June
Cheapest in	April
Average price	£788

Scandinavian Airlines
1/10-15/10
4 total stops
50h 18m total
Portland to London

Search Deals

KLM
10/12
1 total stop
14h 40m total
Portland to London

Search Deals

Highest demand for flights based on searches. 13% potential increase in price (£78 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease (£26 potential savings vs. average return price).

Search Deals

Average for round-trip flights in July 2025

Search Deals

Find flight deals from Portland to Heathrow

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 2 July 2025.

Wed 13/806:10PWM - LHR

1 stop9h 35mJetBlue

Wed 20/811:55LHR - PWM

1 stop17h 22mJetBlue

Deal found 29/6£506

Tue 12/810:48PWM - LHR

2 stops14h 42mUnited Airlines

Wed 20/814:05LHR - PWM

2 stops27h 49mUnited Airlines

Deal found 29/6£532

Tue 12/814:36PWM - LHR

1 stop14h 24mDelta

Wed 20/809:00LHR - PWM

2 stops20h 48mDelta

Deal found 30/6£542

Sat 1/1106:00PWM - LHR

2 stops34h 35mAir Canada

Thu 13/1109:00LHR - PWM

2 stops43h 17mAir Canada

Deal found 1/7£568

Tue 29/718:54PWM - LHR

1 stop13h 36mKLM

Tue 5/816:05LHR - PWM

1 stop13h 52mKLM

Deal found 29/6£578

Thu 21/806:31PWM - LHR

2 stops28h 54mScandinavian Airlines

Mon 25/819:50LHR - PWM

2 stops33h 58mScandinavian Airlines

Deal found 29/6£602

Fri 4/714:19PWM - LHR

2 stops21h 21mTurkish Airlines

Fri 11/722:25LHR - PWM

2 stops30h 52mTurkish Airlines

Deal found 30/6£992

Wed 13/807:28PWM - LHR

3 stops33h 32mMultiple Airlines

Wed 20/806:00LHR - PWM

3 stops22h 03mMultiple Airlines

Deal found 29/6£1,009

Fri 4/714:19PWM - LHR

1 stop14h 11mTAP AIR PORTUGAL

Fri 11/706:00LHR - PWM

2 stops23h 17mTAP AIR PORTUGAL

Deal found 30/6£1,053

Sun 2/1113:06PWM - LHR

1 stop12h 29mAmerican Airlines

Thu 13/1107:50LHR - PWM

2 stops19h 38mAmerican Airlines

Deal found 1/7£1,293

Best flights from Portland to Heathrow
Discover carefully curated flight deals from Portland to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 2 July 2025.

Wed 1/1006:33PWM - LHR

2 stops28h 52mScandinavian Airlines

Wed 15/1007:05LHR - PWM

2 stops21h 26mScandinavian Airlines

Deal found 2/7£478

Thu 4/914:17PWM - LHR

1 stop14h 13mJetBlue

Sun 7/908:15LHR - PWM

1 stop18h 47mJetBlue

Deal found 2/7£511

Wed 1/1014:25PWM - LHR

1 stop15h 15mUnited Airlines

Wed 15/1017:40LHR - PWM

2 stops28h 15mUnited Airlines

Deal found 2/7£531

Tue 12/814:36PWM - LHR

1 stop14h 24mDelta

Wed 20/809:00LHR - PWM

2 stops20h 48mDelta

Deal found 30/6£542

Sat 1/1106:00PWM - LHR

2 stops34h 35mAir Canada

Thu 13/1109:00LHR - PWM

2 stops43h 17mAir Canada

Deal found 1/7£568

Tue 29/718:54PWM - LHR

1 stop13h 36mKLM

Tue 5/816:05LHR - PWM

1 stop13h 52mKLM

Deal found 29/6£578

Sun 2/1113:06PWM - LHR

1 stop12h 29mAmerican Airlines

Tue 11/1107:50LHR - PWM

2 stops19h 38mAmerican Airlines

Deal found 1/7£1,293

Last-minute flights from Portland to Heathrow
Discover last-minute flight deals from Portland to Heathrow. Data last updated 2 July 2025 and is based on user searches.

Fri 4/714:19PWM - LHR

2 stops21h 21mTurkish Airlines

Fri 11/722:25LHR - PWM

2 stops30h 52mTurkish Airlines

Deal found 30/6£992

Fri 4/714:19PWM - LHR

1 stop14h 11mTAP AIR PORTUGAL

Fri 11/706:00LHR - PWM

2 stops23h 17mTAP AIR PORTUGAL

Deal found 30/6£1,053

Tue 12/810:48PWM - LHR

2 stops14h 42mUnited Airlines

Wed 20/814:05LHR - PWM

2 stops27h 49mUnited Airlines

Deal found 29/6£532

Tue 12/814:36PWM - LHR

1 stop14h 24mDelta

Wed 20/809:00LHR - PWM

2 stops20h 48mDelta

Deal found 30/6£542

Tue 12/814:36PWM - LHR

1 stop13h 14mKLM

Wed 20/815:15LHR - PWM

1 stop13h 48mKLM

Deal found 1/7£548

Wed 13/806:10PWM - LHR

1 stop9h 35mJetBlue

Wed 20/811:55LHR - PWM

1 stop17h 22mJetBlue

Deal found 29/6£506

Wed 13/807:28PWM - LHR

3 stops18h 02mAir Canada

Wed 20/808:30LHR - PWM

3 stops19h 33mAir Canada

Deal found 29/6£758

Wed 13/807:28PWM - LHR

3 stops33h 32mMultiple Airlines

Wed 20/806:00LHR - PWM

3 stops22h 03mMultiple Airlines

Deal found 29/6£1,009

Thu 21/806:31PWM - LHR

2 stops28h 54mScandinavian Airlines

Mon 25/819:50LHR - PWM

2 stops33h 58mScandinavian Airlines

Deal found 29/6£602

One-way flights from Portland to Heathrow
Search for one-way flight options from Portland to Heathrow. Find affordable one-way fares based on user searches. Data last updated 2 July 2025.

Wed 10/1214:35PWM - LHR

1 stop14h 40mKLM

Deal found 30/6£295

Thu 10/706:05PWM - LHR

1 stop9h 40mJetBlue

Deal found 1/7£323

Thu 10/714:19PWM - LHR

2 stops22h 26mTAP AIR PORTUGAL

Deal found 1/7£397

Thu 10/712:40PWM - LHR

3 stops26h 25mMultiple Airlines

Deal found 1/7£503

Cheapflights Fare Finder

Use the filters below to find and compare flights from Portland to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 13/8

06:10-20:45

1 stop9h 35m

London Heathrow

Wed 20/8

11:55-00:17

1 stop17h 22m

£506

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 12/8

10:05-06:55

1 stop15h 50m

London Heathrow

Wed 20/8

14:05-12:54

2 stops27h 49m

£532

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

£542

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

£568

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 29/7

18:54-13:30

1 stop13h 36m

London Heathrow

Tue 5/8

16:05-00:57

1 stop13h 52m

£578

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 21/8

06:31-16:25

2 stops28h 54m

London Heathrow

Mon 25/8

19:50-00:48

2 stops33h 58m

£602

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 13/8

07:28-22:00

3 stops33h 32m

London Heathrow

Wed 20/8

06:00-23:03

3 stops22h 03m

£1,009

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 2/11

13:06-06:35

1 stop12h 29m

London Heathrow

Tue 11/11

07:50-22:28

2 stops19h 38m

£1,293

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 13/8

14:19-09:30

1 stop14h 11m

£239

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 10/12

14:35-10:15

1 stop14h 40m

£295

Flights are sorted by cheapest return flights first.

Deals found on 29/6

Showing 1-10 of 13 results

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, January is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of £112). Flying from Portland, Maine to London Heathrow Airport 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 Heathrow

Check out reviews from past customers who have flown with Delta, KLM, andUnited Airlines from Portland to London Heathrow Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,975 reviews

Check prices

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!

Delta

8.0

Very Good

7,975 reviews

Delta

8.0

Very Good

7,975 reviews

Check prices

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!

KLM

7.8

Good

1,366 reviews

Delta

8.0

Very Good

7,975 reviews

Check prices

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!

United Airlines

7.4

Good

8,858 reviews

Delta

8.0

Very Good

7,975 reviews

Check prices

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!

JetBlue

7.3

Good

2,919 reviews

Delta

8.0

Very Good

7,975 reviews

Check prices

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!

Scandinavian Airlines

7.3

Good

1,414 reviews

Delta

8.0

Very Good

7,975 reviews

Check prices

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

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.
What are the cheapest airlines flying from Portland, Maine to London Heathrow Airport round-trip?
Flying on Scandinavian Airlines is currently your cheapest option to London Heathrow Airport, with prices starting at £478. Additional return tickets that might be worth considering are offered by JetBlue and United Airlines, with the lowest prices starting at £511 and £531, respectively. Users have found that Scandinavian Airlines is 30% cheaper than the other options available to this destination.
What are the cheapest airlines to fly from Portland, Maine to London Heathrow Airport one-way?
£295 is the cheapest one-way deal found within the past few days, from KLM. You may also be able to find cheap deals on JetBlue and TAP AIR PORTUGAL, with prices starting from £323 and £397, respectively.
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, January is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of £112). Flying from Portland, Maine to London Heathrow Airport 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

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Deal

Northampton

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Watford

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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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Cheap flights from Portland, Maine to London Heathrow Airport from £239

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 13/8. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Portland to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Portland to Heathrow

Cheapest flights from Portland to HeathrowExplore 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 2 July 2025.

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 2 July 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Portland to London Heathrow Airport that are best for you.

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.

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?

Reviews of airlines servicing Heathrow

Check out reviews from past customers who have flown with Delta, KLM, andUnited Airlines from Portland to London Heathrow Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

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?

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

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

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

How can I find direct flights from Portland to Heathrow?

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

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

Travelling to a place near Portland?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portland to Heathrow

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

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 Portland to Heathrow?

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

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

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

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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 2 July 2025.