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PWM - LON

$455 Find cheap flights from Portland to London

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 London departing on 9/19. 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
0 bags
Wed 7/10
Wed 7/17

Search hundreds of travel sites at once for deals on flights to London

 
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
In the last 7 days travelers have searched 42,898,604 times on KAYAK, and here is why:

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Cheap flight deals from Portland to London (PWM-LON)

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Portland to London 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 and deals for you by selecting your travel dates.
Choose your dates
2:52 pm - 10:00 amPWM-LGW
14h 08m1 stop
12:00 pm - 11:38 pmLGW-PWM
16h 38m1 stop
$612Delta
Find Deal
Wed, Sep 25 - Tue, Oct 8
1:06 pm - 9:30 amPWM-LHR
15h 24m1 stop
11:55 am - 9:29 pmLHR-PWM
14h 34m1 stop
$612JetBlue
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Tue, Sep 24 - Tue, Oct 1
12:58 pm - 10:00 amPWM-LGW
16h 02m2 stops
12:00 pm - 11:38 pmLGW-PWM
16h 38m1 stop
$616Delta
Find Deal
Wed, Sep 25 - Tue, Oct 8
7:26 am - 7:45 amPWM-LHR
19h 19m1 stop
8:20 am - 9:16 pmLHR-PWM
17h 56m2 stops
$617American Airlines
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Tue, Sep 24 - Tue, Oct 1
4:09 pm - 11:10 amPWM-LHR
14h 01m2 stops
9:50 am - 9:16 pmLHR-PWM
16h 26m2 stops
$620American Airlines
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Tue, Sep 24 - Tue, Oct 1
6:00 am - 7:10 amPWM-LHR
21h 10m2 stops
6:00 pm - 11:11 pmLHR-PWM
34h 11m2 stops
$632Air Canada
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Mon, Oct 28 - Thu, Nov 7
3:15 pm - 6:55 amPWM-LHR
11h 40m1 stop
11:10 am - 11:48 pmLHR-PWM
17h 38m2 stops
$634United Airlines
Find Deal
Mon, Oct 28 - Thu, Nov 7
6:00 am - 8:40 pmPWM-LHR
9h 40m1 stop
6:50 am - 7:46 pmLHR-PWM
17h 56m2 stops
$640United Airlines
Find Deal
Tue, Oct 8 - Tue, Oct 22
1:06 pm - 7:55 amPWM-LGW
13h 49m1 stop
10:30 am - 9:29 pmLGW-PWM
15h 59m1 stop
$658JetBlue
Find Deal
Wed, Sep 25 - Sun, Sep 29
11:28 am - 10:00 amPWM-LHR
17h 32m3 stops
6:00 pm - 2:31 pmLHR-PWM
25h 31m3 stops
$738Air Canada
Find Deal
Wed, Sep 25 - Tue, Oct 8

Flights from Portland to London - Travel Insights & Trends

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

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights from Portland to London, 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 is March, where tickets cost $686 on average. On the other hand, the most expensive months are June and July, where the average cost of tickets is $3,871 and $1,212 respectively.

Which airlines provide the cheapest flights from Portland to London?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 3 days, KLM offered the best one-way deal for that route, at $455. KAYAK users also found Portland to London round-trip flights on JetBlue from $612 and on Delta from $612.

Good to know

Low season

November

High season

October

Cheapest flight

$455
Best time to beat the crowds with an average 4% drop in price.
Most popular time to fly and prices are also 23% lower on average.
Flight from Portland to London Heathrow Airport

When to book flights from Portland to London

Are your dates flexible? Find out the best times to travel from Portland to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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 flights from Portland to London

  • What is the cheapest flight from Portland to London?

    In the last 3 days, the lowest price for a flight from Portland to London was $455 for a one-way ticket and $612 for a round-trip.

  • Do I need a passport to fly between Portland and London?

    Yes

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

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Portland to London?

    SkyTeam, Star Alliance, and oneworld are the airline alliances operating flights between Portland and London, with Star Alliance being the most commonly used for this route.

  • Which is the best airline for flights from Portland to London, Delta or JetBlue?

    The two airlines most popular with KAYAK users for flights from Portland to London are Delta and JetBlue. With an average price for the route of $769 and an overall rating of 8.0, Delta is the most popular choice. JetBlue is also a great choice for the route, with an average price of $919 and an overall rating of 7.6.

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

    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.

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

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

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

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London 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?

    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 from Portland up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top 4 airlines serving from Portland to London

 
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 London? 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.
8.0
DeltaOverall score based on 10295 reviews
8.2Boarding
8.6Crew
7.9Comfort
7.4Food
8.0Entertainment
Airline reviews

3 hours late and all they have is was a $12 meal voucher. That’s not even enough to cover fast food.

2.0 MediocreCraig, Jun 2024CVG - LGA
Read more about Delta reviews

3 hours late and all they have is was a $12 meal voucher. That’s not even enough to cover fast food.

Among the poorest flights I’ve had with Delta in a while. Entertainment system failed completely on a 7.5 hr flight. Crew seemed distracted and not the normal friendly crew. Flight overbooked it seemed… very crowded.

If I can, I always fly Delta. I’ve found their service to always be reliable and pleasant.

You could have not cancelled the flight (AA, which I will be flying from now on) left for BOS despite the fictitious weather issues (that no one in my Boston family could see). You could have rebooked my direct flight to another direct flight instead of sending me though JFK, the worst US airport after O’Hara You could have rebooked me on a Main Cabin seat (like the one I paid for in my original ticket instead of putting me a the last row on JFK->BOS leg, pocketing the difference in ticket price But I do not really care whether you will ever do that in a future because in a future neither I nor anyone from my company (unless they pay out of pocket) nor an of my clients and partners (if they heed my advice) will ever be caught dead on any of Delta flights

Really bad baggage handling. Had my Rimowa bag badly damaged at the latches.

It was pretty good I was worried with the short Layover that I might not catch my connection but the gate was there

It was good until there was a 3 hour delay because there was not any pilots to fly the plane.

There was plenty of overhead room but half of the passengers were told they had to check their carryon bags. My partner and I checked in as early as possible and our seats were split across the aisle.

Friendly flight attendants. Comfort plus seats were very comfortable and had lots of leg room. 10A and 10 B.

I've flown many many times on Northwest and then Delta. The crew on this flight were absolutely the best I've had the pleasure of being looked after by.

terrible. Because I felt very unwell during the flight. How do they leave a woman alone in the middle of 2 men? an obese man who was falling on top of me.

They put me on a chair in between two men, one overweight who was almost falling on top of me, and the other was even uncomfortable because I was half falling because of what the other was pushing me. I stayed with. my feet were swollen from fluid retention and from being unable to accommodate myself. it was very uncomfortable. I asked for help but they told me that the flight was full and they couldn't help me. I got off the plane almost unable to walk due to the inflammation. and then at FLL airport I asked for help because I couldn't go to my next flight, which was a connection.

The walk from baggage claim to the taxi is very difficult for older people I will never fly into JFK again. It is physically challenging

Overall fine but both ways for this trip was delayed.

Flight was delayed by almost 5 hours. Suitcase was not loaded despite the flight being near empty (my colleagues’ suitcases did reach JFK, unlike mine). Had to argue on phone to get JetBlue to deliver the case to my hotel. Never again

The flight was excellent. The crew was welcoming and attentive.

Great! I love Jet Blue. My favorite airline! Very efficient, clean and timely.

Run out of snack choices. Why are the seats not padded for your butt? Are we sitting on blocks of wood or metal for $250-300 a pop? This ain’t spirit. Let’s get it together people

We were told that our flight would be delayed for 90+ minutes because of weather, so we went to get something to eat only to have them randomly start boarding 15 minutes after the announcement, with no warning.

Entertainment... No earphones passed out. Many including me couldn't use the TV. Legroom was good. Crew was indifferent and a bit surly. Free wifi was a nice convenience. Check in desk location was unknown. Gate number on the boarding passes was wrong.

Why does it have to be painful to fly long distances?

It is a modern tragedy that any airline expects you to travel for 14 hours in such discomfort and that the only way to add comfort is exorbitant prices. I was in pain by the time we landed. Shameful.

Original plane sidelined. Had to wait an hour for replacement.

Crew was very cooperative and professional. Passenger's first checked in bag should be free.

No real agent onsite helping you for missing luggage there. Not like the other airline next to UA desk, they have staff attending in their desk assisting answer/helping luggage issue, even after midnight.

Horrible, the flights kept delaying, so it is obvious that we won't be able to make it to the next connection. No easier/real agent on site to help you figure this out. UA agent on other counters refuse to assist you and direct us to use the QR code/call customer service. So inefficient and poor. While technology seems convenient, but it's not the best interest/experience for customers need help while there is active issue need assistance.

Food is very bad and entertint not too many options ... flight attendet service is not good

After the morning frenzy of 35 min wait through CLT security at 4;30 AM, it was nice to have a smooth pleasant boarding experience. This 6:30 AM flight was not full. We were able to get seated swiftly and took off promptly. Nice touch they distributed the old fashioned headsets with 8 mm jacks. Snacks were decent and arrival was uneventful.

My window shade didn’t work. So I missed coming into my city. ☹️

Flight was delayed in the gate by 5 hours and ultimately cancelled- rebooking service by United agents was terrible

Information when booking said the flight would be with American Airlines but the flight was actualy with British Airways. Check in from Orlando was nice and quick. I agreed to put my cabin case in the checked luggage as it was a full flight. Case came back damaged (unable to put the handle down) so will have to dispose of it. Seats were quite cramped with very little leg room, even for economy. This was the experience of both the outgoing and return flight. Cabin crew were ok and flight time was punctual.

Missed this flight due to the first AA flight delay

Missed connection from Philadelphia to London because flight from DC was seriously delayed. Was re-routed the next day (had to pay for hotel) to Zurich and was given a main cabin middle seat while I had paid for premium. Great job AA!!!

Original flight delayed several times and finally canceled at 2:30 in the morning. Staff at the gate was not very helpful in resolving problems or communicating why there were delays. I spent 34 hours at the airport before I could leave, they couldn't book me on another early flight even after canceling my original flight. Next flight available after my original flight was canceled was 22 hours later. I will never fly American Airlines again.

very very tight seats unfriendly crew who do not seem to care about the comfort of their passengers and do not know how to smile poor ground staff support at LHR and PHX

So uncomfortable to sit in the tiny space on a long, international. Food was rough. Please, less white flour and processed food.

Our flight was delayed 2.5 hrs due to plane being too hot! After 1.5 hrs, airline decided to use another plane but had to wait for gate, baggage transfer & beverage transfer. Anyone could tell after first half hour that another plane was required and although did not affect us many would miss connecting flights at Heathrow. I have found the stewards are not the friendliest in the industry and the food is questionable, even as I like airplane food normally, the best of the 2 flights was the yogurt & granola for breakfast.

Terrible boarding , Business class seats are sub standard. As usual crew will miss your food too

Just get Economy Plus for international flights, so worth it the extra room, bigger seats…

The return trip was a customer service disaster. American Airlines needs an overhaul of how they treat their customers.

Book cheap flights from Portland to London

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Portland to London found on KAYAK in the last 72 hours.
9/19Thu
1 stopKLM
12h 13mPWM-LHR
$455
9/19Thu
3 stopsAir Canada
17h 32mPWM-LHR
$484
7/13Sat
3 stops
27h 38mPWM-LHR
$503
7/7Sun
2 stopsAir Canada
23h 00mPWM-LHR
$508
7/13Sat
1 stopUnited Airlines
32h 05mPWM-LHR
$509
7/8Mon
3 stopsAir Canada
17h 25mPWM-LHR
$514
7/13Sat
2 stopsAir Canada
52h 30mPWM-LHR
$520
9/18Wed
3 stops
26h 28mPWM-LHR
$562
7/7Sun
3 stops
57h 43mPWM-LHR
$604
7/8Mon
1 stopDelta
15h 06mPWM-LHR
$608

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Last minute flights from Portland to London

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Portland to London that are departing in the next 10 days.
6/14Fri
multi-stopAir Canada
33h 50mPWM-LHR
6/21Fri
multi-stopAir Canada
41h 36mLHR-PWM
$1,664
6/14Fri
multi-stopUnited Airlines
18h 55mPWM-LHR
6/21Fri
multi-stopUnited Airlines
19h 08mLHR-PWM
$1,668
6/14Fri
multi-stopAir France
18h 35mPWM-LHR
6/21Fri
multi-stopAir France
15h 23mLHR-PWM
$1,682
6/14Fri
multi-stop
30h 46mPWM-LHR
6/21Fri
multi-stop
21h 15mLHR-PWM
$1,961
6/14Fri
multi-stop
17h 50mPWM-LHR
6/21Fri
multi-stop
21h 15mLHR-PWM
$2,343

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Portland - London Flights

Departure:

Portland (PWM)United States

Cabin classes: