PDX - LHR

£264 Find Cheap Flights from Portland to London Heathrow Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Portland to Heathrow departing on 26/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Portland to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Portland to London, as well as popular online travel agencies
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Flight Deals

Cheap Flights from Portland to Heathrow (PDX-LHR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Portland to Heathrow that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Portland to Heathrow

Wed, 22 Oct - Wed, 29 Oct
United Airlines Logo
05:00 - 12:20PDX-LHR
23h 20m1 stop
United Airlines Logo
18:00 - 22:10LHR-PDX
35h 10m2 stops
£401United Airlines
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Sun, 2 Nov - Wed, 19 Nov
British Airways Logo
17:45 - 11:20PDX-LHR
9h 35mdirect
British Airways Logo
13:45 - 15:55LHR-PDX
10h 10mdirect
£402British Airways
Find Deal
Sun, 16 Nov - Fri, 5 Dec
Air Canada Logo
09:50 - 11:50PDX-LHR
18h 00m1 stop
Air Canada Logo
13:25 - 09:15LHR-PDX
27h 50m2 stops
£403Air Canada
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Mon, 6 Oct - Wed, 22 Oct
United Airlines Logo
16:07 - 12:20PDX-LHR
12h 13m1 stop
United Airlines Logo
14:10 - 23:01LHR-PDX
16h 51m1 stop
£403United Airlines
Find Deal
Mon, 9 Feb - Wed, 18 Feb
KLM Logo
06:15 - 07:05PDX-LHR
16h 50m1 stop
KLM Logo
06:30 - 11:25LHR-PDX
12h 55m1 stop
£406KLM
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Thu, 20 Nov - Sat, 6 Dec
Icelandair Logo
14:45 - 19:30PDX-LHR
20h 45m1 stop
Icelandair Logo
20:35 - 17:00LHR-PDX
28h 25m1 stop
£407Icelandair
Find Deal
Tue, 30 Sep - Wed, 8 Oct
Delta Logo
13:40 - 11:20PDX-LHR
13h 40m1 stop
Delta Logo
08:40 - 19:19LHR-PDX
18h 39m2 stops
£408Delta
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Thu, 11 Dec - Tue, 16 Dec
Icelandair Logo
14:45 - 19:30PDX-LHR
20h 45m1 stop
Icelandair Logo
20:35 - 17:00LHR-PDX
28h 25m1 stop
£414Icelandair
Find Deal
Wed, 22 Oct - Fri, 31 Oct
Delta Logo
17:25 - 14:15PDX-LHR
12h 50m1 stop
Delta Logo
13:05 - 23:53LHR-PDX
17h 48m2 stops
£416Delta
Find Deal
Thu, 30 Oct - Thu, 6 Nov
Air Canada Logo
15:15 - 11:50PDX-LHR
13h 35m1 stop
Air Canada Logo
14:30 - 14:45LHR-PDX
32h 15m1 stop
£419Air Canada
Find Deal

Everything you should know

Our travellers' advice
AI-generated summary based on content written by travel experts
Finnair's Wi-Fi offers good speeds on long-haul flights.
British Airways' premium economy adds 18 cm legroom.
Expert advice
Expert advice
Expert advice
Expert advice
Top airlines
United Airlines
Cheapest • from £401 (return)
Icelandair
Best reviews • 7.0 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
When to book
3 weeks
in advance
Our data shows that travellers who book at least 3 weeks in advance save around 17% compared to booking last minute.
Insights
Insights
Insights
Insights
When to travel
October
Cheapest • 19% price drop
September
Most popular
Good to know
Good to know
+1
+1
Good to know
Good to know
+1
Cheapest return fare
£401
Typical prices: £450-595
United Airlines
Wed 22/10Wed 29/10
PDX - LHR • 1 stop
Cheapest direct flights
£402
Typical prices: £451-594
British Airways
Tue 21/10Fri 31/10
PDX - LHR • Direct
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Heathrow!
Expert advice

Expert advice for your flight from Portland to Heathrow

 
Snippets provided in this section are AI-generated based on a summarisation of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Finnair

Finnair's A350 features lower cabin altitude and higher humidity, enhancing passenger comfort.


Finnair's Wi-Fi is available on most long-haul flights, keeping you connected at good speeds.

Read more about Finnairby Gabriel Leigh
British Airways

Upgrade to premium economy for 18 cm extra legroom, enhancing comfort on long flights.


BA's premium economy offers priority boarding and larger baggage allowance for long-haul comfort.

Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on Finnair

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Duncan Madden

Duncan Madden

Expert on British Airways

Duncan Madden

Duncan Madden

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Read more
Booking Insights

KAYAK's insights & trends for Portland to Heathrow flights

Get data-powered insights and trends into flights from Portland to Heathrow to help you find the cheapest flights, the best time to fly and much more.

How much is a return flight from Portland to London Heathrow Airport?

What’s the cheapest day of the week to fly from Portland to London Heathrow Airport?

The average price of all round-trip flights from Portland to London Heathrow Airport clicked on KAYAK for each day over the last 12 months.

If your flying dates are flexible, you should consider flying to London Heathrow Airport on a Friday, as we generally find the cheapest rates on that day for this route. On the other hand, Saturday is the most expensive day to fly from Portland to London Heathrow Airport. For your return ticket, we recommend flying on a Wednesday and avoiding Sundays for the best deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Portland to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Portland to London Heathrow Airport is October, where tickets cost £499 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £973 and £798 respectively.

Can I save money by flying with a stopover from Portland to London Heathrow Airport?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.

Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 1 stop stopover the cheapest option at £442 on average.

How far in advance should I book a flight from Portland to London Heathrow Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Portland to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Portland to London Heathrow Airport, you should book around 3 weeks before departure, which saves you about 17% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know - Cheap tickets from Portland to London Heathrow Airport

Low seasonJanuary
Cheapest flight£264
Best time to beat the crowds (12% less expensive on average)
Most popular time to fly and prices are also 11% lower on average.
Flight from Portland to London Heathrow Airport

When to book flights from Portland to Heathrow

Are your dates flexible? Find out the best times to travel from Portland to Heathrow based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking Portland to London Heathrow Airport flights

  • What is the cheapest flight from Portland to London Heathrow Airport?

    In the last 3 days, the lowest price for a flight from Portland to London Heathrow Airport was £359 for a one-way ticket and £545 for a return.

  • Which airports will I be using when flying from Portland to London Heathrow Airport?

    Portland and London Heathrow Airport are both served by 1 main airport. You will leave Portland from Portland and will be arriving at London Heathrow.

  • Which airlines offer Wi-Fi service onboard planes from Portland to London Heathrow Airport?

    All the following airlines offer inflight Wi-Fi service on the Portland to London Heathrow Airport flight route: American Airlines, Delta, KLM, Virgin Atlantic, Air France, Vueling, and Iberia.

  • Which aircraft models fly most regularly from Portland to London Heathrow Airport?

    The Boeing 787-10 Dreamliner is the aircraft model that flies most regularly on the Portland to London Heathrow Airport flight route.

  • Which airline alliances offer flights from Portland to London Heathrow Airport?

    oneworld is the only airline alliance operating flights between Portland and London Heathrow Airport.

  • On which days can I fly direct from Portland to London Heathrow Airport?

    There are direct flights from Portland to London Heathrow Airport on a daily basis.

  • Which is the best airline for flights from Portland to London, Iberia or Icelandair?

    The two airlines most popular with KAYAK users for flights from Portland to London are Iberia and Icelandair. With an average price for the route of £539 and an overall rating of 7.0, Iberia is the most popular choice. Icelandair is also a great choice for the route, with an average price of £442 and an overall rating of 7.0.

  • How does KAYAK find such low prices on flights from Portland to London Heathrow Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Portland to London Heathrow Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Portland to London Heathrow Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Portland is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Portland to London Heathrow Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London Heathrow Airport with an airline and back to Portland with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Portland to London Heathrow Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Portland up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

KAYAK’s top tips for finding a cheap flight from Portland to London Heathrow Airport

  • Looking for a cheap flight from London Heathrow Airport to Portland? 25% of our users found flights on this route for London Heathrow Airport or less round-trip.

Prefer to fly direct from Portland to London Heathrow Airport?

 
Direct data is based off flight results for the next 60 days. Find direct flights from all airlines flying direct from Portland to London Heathrow.
Find which airlines fly direct from Portland Airport to London Heathrow Airport, which days they fly and book direct flights.

Direct departures

Portland to London Heathrow

Monday

British Airways

British Airways

Tuesday

British Airways

British Airways

Wednesday

British Airways

British Airways

Thursday

British Airways

British Airways

Friday

British Airways

British Airways

Saturday

British Airways

British Airways

Sunday

British Airways

British Airways

See more direct flights

Direct returns

London Heathrow to Portland

Monday

British Airways

British Airways

Tuesday

British Airways

British Airways

Wednesday

British Airways

British Airways

Thursday

British Airways

British Airways

Friday

British Airways

British Airways

Saturday

British Airways

British Airways

Sunday

British Airways

British Airways

See more direct flights

Reviews of the top 3 airlines flying from Portland to Heathrow

 
See real verified KAYAK customer reviews for airlines flying from Portland to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Portland to Heathrow? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.0
IcelandairOverall score based on 544 reviews
8.0Crew
7.2Boarding
7.0Entertainment
6.2Food
6.9Comfort
Airline reviews

Handling our luggage was the biggest issue - they lost it and we got it almost 3 days later. Really threw off the beginning of our trip and we really had to change our itinerary accordingly.

4.0 OkayAnonymous, Sept 2025IAD - KEF
Read more Icelandair reviews

Handling our luggage was the biggest issue - they lost it and we got it almost 3 days later. Really threw off the beginning of our trip and we really had to change our itinerary accordingly.

Seat was hard and uncomfortable and the temperature too warm and uncomfortable.

I flew Icelandair with my partner from Prague to the US. Overall flight time was around 12 hours, with a connecting flight in Iceland. I have flown internationally for years and with multiple airlines. Every airline serves you a meal when traveling internationally. Icelandair not only did not offer an inclusive meal, but they did not even offer a snack. The only things they served over our long flight was water and coffee. Ridiculous! Never again will I fly with Icelandair.

It was good. The air plane is clean and staff were friendly.

Worst airline I’ve ever flown. Delayed 5.5 hrs, missed connecting flight, and missed an entire day of vacation. Zero customer service

Everything sucked. No food, one small glass of water, a tiny coffee, 5.5 hour delay with no customer service. Would never recommend flying them.

The crew was wonderful at check in, the gate and on board. Felt the luggage had more room than the passengers. The seats were smaller than most domestic U.S. airlines. I'm only 5'2" and I had little legroom. There were only 2 bathrooms in coach. Needed more. The flight was very smooth but not the most comfortable.

There was no lounge at Boston for us to use. Typically flying first class overseas comes with lounge privileges. The seats did not recline even a little. My headset only worked on one side. I felt like I was flying on Ryan Air, not Icelandic Air.

Boarded with no problems. Sat on the tarmac for an hour before taking off. We were the last ones on our connecting flight. Didn't think we were going to make it. Our flight to Iceland was similarly delayed. When we've flown other airlines, pilots have tried to make up time while in the air. This doesn't seem to be something that Icelandair does. We made all of our flights, but it was stressful and we didn't think it was going to happen based on the time we arrived.

The flight was delayed and as a consequence we missed our connecting flight. Were stuck for another 6h in Reykyavik. Appreciated that we got a generous food voucher at least. Would have liked to see more information upon arrival including a person waiting for connecting flight travellers and informing already that we will not catch the flight and directing us to the office dealing with the matter; unfortunately that didnt happen and we hence first needed to find out whether flight had indeed left already and then locate the adequate office to help us with booking us on the next connecting flight. Also my suitcase broke and it is not clear whether it is happened on the leg with Iceland Air from DC to Reykyavik or on the leg with Lufthansa from Reykyavik to Frankfurt. Finally, understood that it is a low cost company but at least provision of earplugs for free would have been nice, instead of making them buy.

It was fortunate that the flight arrived in London in accordance with schedule, and the luggage was promptly transferred to the luggage carousel. However, I find it concerning that even minor issues in economy cabins are prevalent within the industry. American Airlines, in particular, appears to have the least legroom and feels more crowded due to the proximity of neighboring passengers. Additionally, the crew’s adherence to protocol is inconsistent. While they may enforce certain rules set by the FAA on a select few individuals, they often overlook numerous violations, such as failing to reset seat recline during landing.

Easy and organized getting in and out of the flight

We liked the flight but while we purchased an aisle seat, our seats had a different configuration on this flight. A fellow passenger suggested that the airplane had been changed. Too bad we were not informed and had no chance to modify our seat preferences. We were stuck in the window and middle seats with no chance to walk around and go to the bathroom without disturbing our sleeping fellow passenger.

The crew were not very personable. The crew did not serve tea or coffee. The bathroom was not kept clean. Two out of the 5 toilets in the cabin weren't working.

It was extremely cold in the back of the plane. The seats are uncomfortable and space very small. Crew was excellent as usual.

Check in needed to be in person, not nice. Also I won’t do connections in Charlotte again because you need to go through security again and short connections become a problem

Iberia lost my bag, said they found it in another country, said they sent it to me, but never did. Went my whole trip without my stuff, but expecting it to show up because that’s what they said would happen. Their communication sucks, their website sucks, and to top it all off, their seats are small and uncomfortable. They’re bad at their jobs and they should feel bad about themselves. Do not even get me started on the flight home. AVOID!

I described my experience in the previous window. I didn't realize that there would be another opportunity for this flight. Please look at my response in the previous window.

Boarding was 2 1/2 late no explanation Captain said he did not know why, but he rested at home for an extra couple of hours. Food was edible, Nothing more.

I liked the comfort of the plane. It was unexpected from past experiences.

The seating has become ridiculous… like a contest to see how narrow and short they can be made- forcing anyone over 5’1 to pay more to not be twisting oneself into a pretzel. Really insane- would have thought BA was better than this. Frankly- it cancels out a lot of the positive aspects.

flight was delayed from BWI to London - missed my connecting flight & then connecting flight (also British Air) was delayed - food is awful, TV & movie selection is great

Super tight economy class. My knees were hitting the back of seat in front of me (I'm only 5'6"). My small backpack (sized according to their required dimensions) would not fit under the seat in front of me because there is a box (is that the life jacket?) in the way. Over all, extremely uncomfortable. I forgive the tasteless food, but the tight seating was torture

Didn’t fly with them as someone had cancelled my flight

Online check-in 24 hours in advance something seems not so easy to check in to pick seats and to print a boarding pass

I like the crew, very welcoming. Food can be better. The seat arms don’t go up so. I could use the empty seat next to mine to relax better. 3hrs delay 😠

Boarding was efficient and quick, crew was very attentive, seats were comfortable.

Everything was very good! I personally struggled with the heat in the cabin for the first 2 hours

Very caring crew on board. Didn’t have dinner as I was sleeping. Was seating in the emergency row so I had comfortable leg room

Had a nice little suite although I couldn’t close the door (but I didn’t ask anyone to help). 5K is a nice seat and very private (you look in on first class). Enjoyable flight and nice crew.

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