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

JetBlue, at $644, was found to be the cheapest airline from Portland, Maine to London Heathrow Airport.Alternate airlines to your destination round-trip include Scandinavian Airlines and Air Canada. These flights start at 33% lower than the current average price 3 months from now.

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

Travelers seeking maximum savings on their Portland, Maine to London Heathrow Airport flight should consider departing on Thursday afternoons when fares are most often at their lowest. Wednesday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

What are the most popular airlines that fly from Portland, Maine to London Heathrow Airport?

Consider JetBlue, Delta or United Airlines when booking your flight. These represent the most popular airlines when flying from Portland, Maine to London Heathrow Airport.

What is the cheapest day to fly round-trip from Portland, Maine to London Heathrow Airport?

It’s generally more expensive to depart on a Saturday, if you have to leave on this day you can still search on Cheapflights to find great options that meet your needs.

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

November can be a great time to fly to London Heathrow Airport from Portland, Maine with a flight ticket averaging about $864. Cheapflights users have found deals in the month of November for as cheap as $696. The most expensive prices can be found in the month of June.

Most accurate provider : When it comes to deals on Portland, Maine-London Heathrow Airport flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Portland, Maine-London Heathrow Airport flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from Portland, Maine-London Heathrow Airport flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Portland, Maine-London Heathrow Airport flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland, Maine-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

What airport do you fly from for flights from Portland to London Heathrow?

Portland (PWM) is the airport you will fly out of if you book a flight from Portland to London Heathrow. You should not have trouble finding flights to London Heathrow from Portland; the airport handles an average of 0 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 3 airlines have flights from the Portland airport to London Heathrow. It is only a 2.9 mi journey to Portland (PWM) from Portland’s city center.

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 vacation 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.

$530+ Flights from Portland, ME to London Heathrow Airport

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Portland to Heathrow with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Portland to Heathrow

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$644 (JetBlue)
One-way from	$530 (JetBlue)
Popular in	June
Cheapest in	April
Average price	$721

Provider with most accurate pricing for Portland-London Heathrow flight deals.

Search Deals

Provider most trusted by Cheapflights users for Portland-London Heathrow flights.

Search Deals

From Portland to London Heathrow

Search Deals

One-way flight from Portland to London Heathrow

Search Deals

Highest demand for flights based on searches. 12% potential increase in price ($140 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($45 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in April 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 April 29, 2025.

Mon 5/123:35 pmPWM - LHR

1 stop12h 55mJetBlue

Thu 5/1511:55 amLHR - PWM

1 stop16h 04mJetBlue

Deal found 4/28

$644

Wed 9/172:35 pmPWM - LHR

2 stops22h 05mScandinavian Airlines

Mon 9/2210:20 amLHR - PWM

2 stops18h 11mScandinavian Airlines

Deal found 4/28

$682

Tue 11/256:00 amPWM - LHR

2 stops20h 10mAir Canada

Wed 12/36:00 pmLHR - PWM

2 stops34h 17mAir Canada

Deal found 4/28

$771

Tue 11/256:00 amPWM - LHR

1 stop9h 35mUnited Airlines

Wed 12/37:40 amLHR - PWM

2 stops16h 44mUnited Airlines

Deal found 4/28

$773

Tue 11/2512:30 pmPWM - LHR

1 stop12h 55mKLM

Wed 12/312:30 pmLHR - PWM

1 stop14h 29mKLM

Deal found 4/28

$788

Tue 11/256:00 amPWM - LHR

3 stops19h 30mMultiple Airlines

Wed 12/39:00 amLHR - PWM

2 stops19h 17mMultiple Airlines

Deal found 4/28

$794

Fri 5/163:35 pmPWM - LHR

2 stops19h 25mTurkish Airlines

Sat 5/246:30 amLHR - PWM

2 stops21h 29mTurkish Airlines

Deal found 4/28

$963

Wed 7/302:34 pmPWM - LHR

1 stop14h 41mDelta

Wed 8/611:45 amLHR - PWM

2 stops18h 12mDelta

Deal found 4/28

$1,044

Fri 9/512:11 pmPWM - LHR

1 stop12h 44mAustrian Airlines

Sat 9/67:30 pmLHR - PWM

2 stops27h 56mAustrian Airlines

Deal found 4/28

$1,640

Sat 6/142:19 pmPWM - LHR

1 stop14h 11mTAP AIR PORTUGAL

Thu 6/198:00 amLHR - PWM

2 stops20h 52mTAP AIR PORTUGAL

Deal found 4/28

$5,474

Fri 5/165:30 amPWM - LHR

1 stop20h 15mVirgin Atlantic

Sat 5/249:00 amLHR - PWM

2 stops19h 59mVirgin Atlantic

Deal found 4/28

$5,522

Fri 5/1612:08 pmPWM - LHR

1 stop13h 42mAmerican Airlines

Sat 5/241:10 pmLHR - PWM

2 stops14h 35mAmerican Airlines

Deal found 4/28

$10,025

Best flights from Portland to Heathrow
Discover carefully curated flight deals from Portland to Heathrow that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 29, 2025.

Mon 5/123:35 pmPWM - LHR

1 stop12h 55mJetBlue

Thu 5/1511:55 amLHR - PWM

1 stop16h 04mJetBlue

Deal found 4/28

$644

Wed 9/172:35 pmPWM - LHR

2 stops22h 05mScandinavian Airlines

Mon 9/2210:20 amLHR - PWM

2 stops18h 11mScandinavian Airlines

Deal found 4/28

$682

Fri 8/153:04 pmPWM - LHR

2 stops48h 56mAir Canada

Mon 8/255:40 pmLHR - PWM

2 stops29h 46mAir Canada

Deal found 4/28

$827

Fri 8/156:00 amPWM - LHR

1 stop9h 40mUnited Airlines

Mon 8/259:30 amLHR - PWM

2 stops30h 27mUnited Airlines

Deal found 4/28

$865

Fri 8/1512:59 pmPWM - LHR

1 stop12h 46mKLM

Mon 8/254:05 pmLHR - PWM

1 stop12h 40mKLM

Deal found 4/28

$888

Fri 8/158:00 amPWM - LHR

3 stops17h 30mMultiple Airlines

Mon 8/259:30 amLHR - PWM

2 stops13h 56mMultiple Airlines

Deal found 4/28

$894

Fri 5/163:35 pmPWM - LHR

2 stops19h 25mTurkish Airlines

Sat 5/246:30 amLHR - PWM

2 stops21h 29mTurkish Airlines

Deal found 4/28

$963

Wed 7/302:34 pmPWM - LHR

1 stop14h 41mDelta

Wed 8/611:45 amLHR - PWM

2 stops18h 12mDelta

Deal found 4/28

$1,044

Fri 9/512:11 pmPWM - LHR

1 stop12h 44mAustrian Airlines

Sat 9/67:30 pmLHR - PWM

2 stops27h 56mAustrian Airlines

Deal found 4/28

$1,640

Sat 6/142:19 pmPWM - LHR

1 stop14h 11mTAP AIR PORTUGAL

Thu 6/198:00 amLHR - PWM

2 stops20h 52mTAP AIR PORTUGAL

Deal found 4/28

$5,474

Fri 5/165:30 amPWM - LHR

1 stop20h 15mVirgin Atlantic

Sat 5/249:00 amLHR - PWM

2 stops19h 59mVirgin Atlantic

Deal found 4/28

$5,522

Fri 5/1612:08 pmPWM - LHR

1 stop13h 42mAmerican Airlines

Sat 5/241:10 pmLHR - PWM

2 stops14h 35mAmerican Airlines

Deal found 4/28

$10,025

Last-minute flights from Portland to Heathrow
Discover last-minute flight deals from Portland to Heathrow. Data last updated April 29, 2025 and is based on user searches.

Mon 5/123:35 pmPWM - LHR

1 stop12h 55mJetBlue

Thu 5/1511:55 amLHR - PWM

1 stop16h 04mJetBlue

Deal found 4/28

$644

Fri 5/1611:50 amPWM - LHR

1 stop15h 30mUnited Airlines

Mon 6/22:25 pmLHR - PWM

2 stops33h 52mUnited Airlines

Deal found 4/28

$941

Fri 5/163:35 pmPWM - LHR

2 stops19h 25mTurkish Airlines

Sat 5/246:30 amLHR - PWM

2 stops21h 29mTurkish Airlines

Deal found 4/28

$963

Fri 5/165:30 amPWM - LHR

1 stop20h 15mVirgin Atlantic

Sat 5/249:00 amLHR - PWM

2 stops19h 59mVirgin Atlantic

Deal found 4/28

$5,522

Fri 5/1612:08 pmPWM - LHR

1 stop13h 42mAmerican Airlines

Sat 5/241:10 pmLHR - PWM

2 stops14h 35mAmerican Airlines

Deal found 4/28

$10,025

Mon 5/262:30 pmPWM - LHR

1 stop13h 20mKLM

Mon 6/23:15 pmLHR - PWM

1 stop13h 44mKLM

Deal found 4/28

$1,164

Tue 5/276:35 amPWM - LHR

2 stops22h 00mScandinavian Airlines

Tue 6/37:05 amLHR - PWM

2 stops22h 09mScandinavian Airlines

Deal found 4/28

$1,056

Tue 5/276:10 amPWM - LHR

3 stops19h 20mAir Canada

Tue 6/38:45 amLHR - PWM

3 stops19h 42mAir Canada

Deal found 4/28

$1,098

Tue 5/276:10 amPWM - LHR

3 stops19h 20mMultiple Airlines

Tue 6/32:05 pmLHR - PWM

2 stops14h 22mMultiple Airlines

Deal found 4/28

$1,110

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 April 29, 2025.

Wed 6/186:10 amPWM - LHR

1 stop9h 35mJetBlue

Deal found 4/28

$530

Wed 6/186:20 amPWM - LHR

3 stops19h 10mAir Canada

Deal found 4/28

$838

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

Mon 5/12

3:35 pm-9:30 am

1 stop12h 55m

London Heathrow

Thu 5/15

11:55 am-10:59 pm

1 stop16h 04m

$644

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 9/17

2:35 pm-5:40 pm

2 stops22h 05m

London Heathrow

Mon 9/22

10:20 am-11:31 pm

2 stops18h 11m

$682

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 8/15

3:04 pm-9:00 pm

2 stops48h 56m

London Heathrow

Mon 8/25

5:40 pm-6:26 pm

2 stops29h 46m

$827

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 8/15

6:00 am-8:40 pm

1 stop9h 40m

London Heathrow

Mon 8/25

9:30 am-10:57 am

2 stops30h 27m

$865

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 8/15

12:59 pm-6:45 am

1 stop12h 46m

London Heathrow

Mon 8/25

4:05 pm-11:45 pm

1 stop12h 40m

$888

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 8/15

8:00 am-6:30 am

3 stops17h 30m

London Heathrow

Mon 8/25

9:30 am-6:26 pm

2 stops13h 56m

$894

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 5/16

3:35 pm-4:00 pm

2 stops19h 25m

London Heathrow

Sat 5/24

6:30 am-10:59 pm

2 stops21h 29m

$963

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 7/30

2:34 pm-10:15 am

1 stop14h 41m

London Heathrow

Wed 8/6

11:45 am-12:57 am

2 stops18h 12m

$1,044

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 9/5

12:11 pm-5:55 am

1 stop12h 44m

London Heathrow

Sat 9/6

7:30 pm-6:26 pm

2 stops27h 56m

$1,640

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 6/14

2:19 pm-9:30 am

1 stop14h 11m

London Heathrow

Thu 6/19

8:00 am-11:52 pm

2 stops20h 52m

$5,474

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 14 results

Compare providers for flights from Portland to Heathrow

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Heathrow in April.

Provider	Price Accuracy	Trust Score*
FlightHub	Price Accuracy3 stars	Trust Score*2 stars
eDreams	Price Accuracy3 stars	Trust Score*3 stars
AranGrant	Price Accuracy3 stars	Trust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

Most accurate provider: When it comes to deals on Portland, Maine-London Heathrow Airport flights, users find the pricing of AranGrant to be most consistent on Cheapflights vs. AranGrant Users can find the same prices on Portland, Maine-London Heathrow Airport flight deals on Cheapflights vs. AranGrant >95% of the time. Price accuracy is based on data collected from Portland, Maine-London Heathrow Airport flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Portland, Maine-London Heathrow Airport flights, Cheapflights users trust AranGrant the most. AranGrant has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Portland, Maine-London Heathrow Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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 round-trip 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, November is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of $661). Flying from Portland, Maine to London Heathrow Airport in June is currently the most expensive (average of $1,110). 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 PWM to LHR?

It’s typically best to fly out from Portland, Maine to London Heathrow Airport in the afternoon. Doing so could potentially save you 10% on the flight price compared to flying in the morning, which is usually more expensive.

Rainfall in Heathrow by month

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Temperature in Heathrow by month

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 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

Reviews of airlines servicing Heathrow

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very good

7,929 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

KLM

7.8

Good

1,333 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Austrian Airlines

7.6

Good

780 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines

7.4

Good

8,696 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Virgin Atlantic

7.4

Good

642 reviews

Delta

8.0

Very good

7,929 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

What airport do you fly from for flights from Portland to London Heathrow?
Portland (PWM) is the airport you will fly out of if you book a flight from Portland to London Heathrow. You should not have trouble finding flights to London Heathrow from Portland; the airport handles an average of 0 outbound flights to London Heathrow per day. You should also have plenty of airline options to choose from since 3 airlines have flights from the Portland airport to London Heathrow. 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 Heathrow Airport round-trip?
JetBlue, at $644, was found to be the cheapest airline from Portland, Maine to London Heathrow Airport.Alternate airlines to your destination round-trip include Scandinavian Airlines and Air Canada. These flights start at 33% lower than the current average price 3 months from now.
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 vacation 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, November is the cheapest month in which you can book a flight from Portland, Maine to London Heathrow Airport (average of $661). Flying from Portland, Maine to London Heathrow Airport in June is currently the most expensive (average of $1,110). 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

Hayes

Hounslow

Thornton Heath

Luton

Horley

Canterbury

Harrow

Wembley

Dover

Stratford-upon-Avon

Gatwick

Orpington

Watford

Northampton

Croydon

Borehamwood

Folkestone

Ilford

Broadway

Aylesbury

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Portland to Heathrow

Boston to Heathrow flights

Boston to Gatwick flights

Boston to London City flights

Boston to Stansted flights

Boston to Luton flights

Portland to Gatwick flights

Bangor to Heathrow flights

Portland to London City flights

Boston to Southend flights

Other flights to Heathrow

Orlando to Heathrow flights

John F Kennedy Intl to Heathrow flights

Boston to Heathrow flights

Dulles Intl to Heathrow flights

Newark to Heathrow flights

Los Angeles to Heathrow flights

London Heathrow Airport to Paris Orly Airport flights

London Heathrow Airport to Manchester flights

London Heathrow Airport to Edinburgh flights

London Heathrow Airport to Belfast City Airport flights

London Heathrow Airport to Aberdeen flights

London Heathrow Airport to Glasgow Intl Airport flights

London Heathrow Airport to Inverness flights

London Heathrow Airport to Duesseldorf Intl Airport flights

London Heathrow Airport to Barcelona-El Prat Airport flights

London Heathrow Airport to Geneva flights

London Heathrow Airport to Brussels Bruxelles-National Airport flights

London Heathrow Airport to Luxembourg flights

London Heathrow Airport to Newcastle upon Tyne flights

London Heathrow Airport to Paris Charles de Gaulle Airport flights

London Heathrow Airport to Amsterdam flights

London Heathrow Airport to Milan Linate Airport flights

London Heathrow Airport to Prague flights

London Heathrow Airport to Milan Malpensa Airport flights

Top 3 airlines flying from Portland to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
JetBlue	Cheapest$586	Average$678	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$715	Average$951	FlexibilityNo cancel fee	On-time69%
Delta	Cheapest$789	Average$963	FlexibilityNo cancel fee	On-timeN/A

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$530+ Cheap flights from Portland, ME (PWM) to Heathrow (LHR)

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 6/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Portland to Heathrow with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Portland to Heathrow

Most accurate provider

Most trusted provider

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 April 29, 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 April 29, 2025.

Cheapflights Fare Finder

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

Compare providers for flights from Portland to Heathrow

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.

Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Portland to Heathrow in April.

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?

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

Find hourly flight availability from Portland to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated April 29, 2025.

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

Reviews of airlines servicing Heathrow

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?

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?

Traveling 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.

Top 3 airlines flying from Portland to Heathrow

100% Free

Book with Flexibility

Travel Smart

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 April 29, 2025.