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Cheap flights from Portland to London from £187

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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — LON
23 Aug — 30 Aug1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Portland to London are usually found in November or October, booked 81 days in advance, depart on a Saturday or Friday and return on a Thursday

Cheap flight deals from Portland to London

Enter your travel dates to find the best prices.

Cheapest flights from Portland to London
Explore the most affordable flight options available from Portland to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 24 July 2026.

Sun 6/919:00
PDX
-
LHR
1 stop17h 20m
Icelandair
Tue 15/921:25
LHR
-
PDX
1 stop28h 30m
Icelandair
Deal found 19/7£639
Sun 6/919:00
PDX
-
LHR
1 stop17h 20m
Icelandair
Mon 14/921:25
LHR
-
PDX
1 stop28h 30m
Icelandair
Deal found 20/7£640
Sat 10/1015:30
PDX
-
LHR
1 stop12h 25m
Icelandair
Fri 23/1013:05
LHR
-
PDX
1 stop12h 50m
Icelandair
Deal found 20/7£644
Fri 14/807:00
PDX
-
LGW
1 stop19h 00m
Multiple Airlines
Wed 26/814:00
LGW
-
PDX
2 stops30h 52m
Multiple Airlines
Deal found 19/7£645
Sun 1/1110:00
PDX
-
LHR
1 stop17h 50m
Lufthansa
Wed 11/1106:35
LHR
-
PDX
2 stops22h 33m
Lufthansa
Deal found 20/7£647
Mon 5/1015:30
PDX
-
LGW
1 stop15h 10m
Icelandair
Thu 15/1015:40
LGW
-
PDX
1 stop34h 15m
Icelandair
Deal found 19/7£650
Wed 28/1010:00
PDX
-
LHR
2 stops16h 20m
Multiple Airlines
Wed 4/1109:00
LHR
-
PDX
2 stops22h 12m
Multiple Airlines
Deal found 19/7£652
Wed 26/819:00
PDX
-
LHR
1 stop17h 20m
Icelandair
Tue 22/913:05
LHR
-
PDX
1 stop12h 50m
Icelandair
Deal found 19/7£654
Mon 26/1010:00
PDX
-
LHR
2 stops16h 20m
Lufthansa
Tue 10/1106:30
LHR
-
PDX
2 stops22h 32m
Lufthansa
Deal found 20/7£655
Wed 28/1011:39
PDX
-
LHR
1 stop12h 26m
Delta
Wed 4/1106:30
LHR
-
PDX
1 stop12h 50m
Delta
Deal found 19/7£657
Mon 5/1015:30
PDX
-
LGW
2 stops18h 55m
Multiple Airlines
Thu 15/1012:40
LGW
-
PDX
3 stops28h 51m
Multiple Airlines
Deal found 19/7£657
Fri 11/919:00
PDX
-
LGW
1 stop32h 45m
Multiple Airlines
Mon 21/914:00
LGW
-
PDX
1 stop38h 12m
Multiple Airlines
Deal found 19/7£660

Find flight deals from Portland to London

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to London (LON). 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 24 July 2026.

Round-trip from

£639

One-way from

£187

Popular in

July

Cheapest in

November

Average price

£919

Good round-trip deal

£786 or less
Icelandair
  • Icelandair
  • 6/9-15/9
  • 2 total stops
  • 45h 50m total
  • Portland to London
Search Deals
5/10
  • 5/10
  • 2 total stops
  • 15h 20m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£117 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£20 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Portland to London (LON).
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portland to London 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 24 July 2026.
Use the filters below to find and compare flights from Portland to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

PortlandLondon

PDX - LGW

PDXLGW

Portland

Thu 13/8

15:35-18:50

1 stop19h 15m

London Gatwick

Wed 19/8

19:40-13:35

1 stop25h 55m

£681

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 9/12

15:15-11:50

1 stop12h 35m

London Heathrow

Fri 18/12

07:40-23:12

1 stop23h 32m

£683

PortlandLondon

PDX - LCY

PDXLCY

Portland

Mon 7/12

13:20-18:25

1 stop21h 05m

London City

Mon 14/12

07:45-21:27

2 stops21h 42m

£717

PortlandLondon

PDX - LTN

PDXLTN

Portland

Thu 12/11

14:45-23:55

2 stops25h 10m

London Luton

Wed 18/11

07:45-17:00

2 stops17h 15m

£723

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 16/9

07:10-07:40

2 stops16h 30m

London Heathrow

Tue 22/9

06:30-11:10

1 stop12h 40m

£724

PortlandLondon

PDX - LCY

PDXLCY

Portland

Thu 12/11

13:19-17:05

2 stops19h 46m

London City

Wed 18/11

09:15-21:02

2 stops19h 47m

£724

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 8/9

07:10-06:20

1 stop15h 10m

London Heathrow

Fri 25/9

09:55-22:02

2 stops20h 07m

£724

PortlandLondon

PDX - LGW

PDXLGW

Portland

Sat 26/9

23:30-08:25

2 stops48h 55m

London Gatwick

Tue 6/10

18:35-19:06

2 stops32h 31m

£724

PortlandLondon

PDX - LTN

PDXLTN

Portland

Tue 22/9

10:10-22:10

3 stops28h 00m

London Luton

Mon 28/9

19:40-09:31

3 stops45h 51m

£724

PortlandLondon

PDX - LTN

PDXLTN

Portland

Sat 29/8

15:30-21:00

2 stops21h 30m

London Luton

Tue 15/9

07:05-09:31

3 stops34h 26m

£726

Flights are sorted by cheapest return flights first.

Deals found on 22/7

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Portland to London

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

What is the cheapest month to book a flight from Portland to London?

Currently, February is the cheapest month in which you can book a flight from Portland to London (average of £509). Flying from Portland to London in July is currently the most expensive (average of £939). 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 PDX to LON?

Find hourly flight availability from Portland to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 24 July 2026.

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

Weekly flight availability from Portland to London

Explore weekly flight availability from Portland to London. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 24 July 2026.

The most flights from PDX to LON are scheduled on a Tuesday (7 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (2 on average).

How much does it cost for a return flight from Portland to London?

Airfare is typical for this route at the moment.
Portland to London flights typically cost between £579 and £971 in September.
The cheapest return price found within the last 5 days was £639 on Icelandair (6 Sept–15 Sept).

What’s the top stopover airport for flights from Portland to London?

Share of one-stop return flights from Portland to London chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Reykjavik (KEF) – chosen by Cheapflights users on 68% of one-stop itineraries from Portland to London on Cheapflights.

What’s the cheapest stopover airport for flights from Portland to London?

Average return fare for one-stop flights from Portland to London, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £375.

What’s the fastest stopover option from Portland to London?

Shortest average travel time for one-stop one-way flights from Portland to London, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 12h 05m.

Which airport typically offers the quickest stopover for flights from Portland to London?

Average stopover duration for one-stop one-way flights from Portland to London, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 1h 20m.

How far ahead should I book a flight from Portland to London?

Booking 15 days in advance of your planned departure date is, on average, the best time to get cheap flights from Portland to London. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Reviews of airlines servicing London

Get insights into the airlines that provide service to London. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to London. Reviews last updated 24 July 2026.
Read reviews from past customers who have flown with Icelandair and British Airways from Portland to London. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Icelandair
7.0
Good
717 reviews
Check prices

Overall

7.0

Comfort

6.9

Entertainment

6.9

Crew

8.0

Food

6.1

Boarding

7.2

Reviews

1 / 20
6.0
Good

William,Jun 2026

SEA - KEF

First time Iceland Air. Ridiculously small amount of leg room, flight was hotter than hades and people kept requesting for cooler air that never came. You pay for everything, no food of any kind unless you pay which I've never seen on a flight of this length. Just seemed like they are cheap as possible about everything. Won't fly with them again if I can avoid it.
Icelandair
7.0
Good
717 reviews
Icelandair
7.0
Good
717 reviews
Check prices

Overall

7.0

Comfort

6.9

Entertainment

6.9

Crew

8.0

Food

6.1

Boarding

7.2

Reviews

1 / 20
6.0
Good

William,Jun 2026

SEA - KEF

First time Iceland Air. Ridiculously small amount of leg room, flight was hotter than hades and people kept requesting for cooler air that never came. You pay for everything, no food of any kind unless you pay which I've never seen on a flight of this length. Just seemed like they are cheap as possible about everything. Won't fly with them again if I can avoid it.
British Airways
6.7
Okay
8,132 reviews
Icelandair
7.0
Good
717 reviews
Check prices

Overall

7.0

Comfort

6.9

Entertainment

6.9

Crew

8.0

Food

6.1

Boarding

7.2

Reviews

1 / 20
6.0
Good

William,Jun 2026

SEA - KEF

First time Iceland Air. Ridiculously small amount of leg room, flight was hotter than hades and people kept requesting for cooler air that never came. You pay for everything, no food of any kind unless you pay which I've never seen on a flight of this length. Just seemed like they are cheap as possible about everything. Won't fly with them again if I can avoid it.

Related info for your journey

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

    For a flight from Portland to London, you will be flying from Portland. Portland (PDX) is just 6.0 mi from the center of the city. Portland is the only Portland airport and it handles 6 outbound flights to London per day. 1 airline has flights to London from Portland on a regular basis.

  • How long is the flight from Portland to London?

    For as low as £683, Condor can have you in London from Portland in 12h 35m. The distance between Portland and London is about 4896 mi. This flight may include one or multiple stops.

  • What is the cheapest airline to fly from Portland to London round-trip?

    Cheapflights users have booked flights from Portland to London round-trip from £443. British Airways is 30% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the most popular routes from Portland to London?

    When deciding which route to take from Portland to London consider Portland - London Heathrow, Portland - London Gatwick or Portland - London Stansted as they are the most popular.

  • What are the most reliable airlines from Portland to London?

    The top 3 most reliable airlines when flying from Portland to London are American Airlines (73%), Alaska Airlines (73%) and Aer Lingus (73%).

  • What are the cheapest flights from Portland to London?

    Looking at all options, your cheapest flight can be booked for £783. While the most popular route (Portland - London Heathrow) can be booked for £598 on average, our data indicates £844 when flying from Portland to London.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portland to London 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 to London?

    Currently, February is the cheapest month in which you can book a flight from Portland to London (average of £509). Flying from Portland to London in July is currently the most expensive (average of £939). 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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Top airline flying from Portland to London

Discover the top airline that operate flights from Portland to London. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 24 July 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£443Average£811FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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

When you search for this flight from Portland to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

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

Millions of users choose and trust Cheapflights to book the best flight deals from Portland to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Cheapflights does show flights with no change fees to all users. To see these options for flights from Portland to London, users can toggle the no change fees filter when performing a flight search.

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

Of course! You can now track prices for flights from Portland to London and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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