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Cheap flights from Portland to London Heathrow Airport from £208

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 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
PDX — LHR
5 Mar — 12 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Portland to London Heathrow are usually found in October or April, booked 86 days in advance, depart on a Saturday or Friday and return on a Wednesday

Cheap flight deals from Portland to Heathrow

Enter your travel dates to find the best prices.

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 3 February 2026.

Tue 7/415:30
PDX
-
LHR
1 stop12h 25m
Icelandair
Fri 24/413:05
LHR
-
PDX
1 stop12h 55m
Icelandair
Deal found 31/1£439
Mon 2/309:50
PDX
-
LHR
1 stop18h 00m
Lufthansa
Wed 18/311:10
LHR
-
PDX
2 stops20h 25m
Lufthansa
Deal found 2/2£439
Tue 31/315:30
PDX
-
LHR
1 stop12h 25m
Icelandair
Tue 7/421:25
LHR
-
PDX
1 stop28h 35m
Icelandair
Deal found 2/2£442
Sat 18/415:30
PDX
-
LHR
1 stop12h 25m
Icelandair
Wed 29/413:05
LHR
-
PDX
1 stop12h 55m
Icelandair
Deal found 2/2£443
Tue 28/415:15
PDX
-
LHR
1 stop14h 05m
Multiple Airlines
Tue 5/508:45
LHR
-
PDX
2 stops18h 20m
Multiple Airlines
Deal found 1/2£445
Tue 3/309:50
PDX
-
LHR
1 stop18h 00m
Lufthansa
Thu 12/320:15
LHR
-
PDX
2 stops31h 55m
Lufthansa
Deal found 1/2£446
Tue 21/415:15
PDX
-
LHR
1 stop14h 05m
Multiple Airlines
Thu 7/506:00
LHR
-
PDX
2 stops21h 05m
Multiple Airlines
Deal found 1/2£447
Wed 30/910:10
PDX
-
LHR
2 stops17h 40m
Multiple Airlines
Thu 15/1008:40
LHR
-
PDX
2 stops18h 26m
Multiple Airlines
Deal found 1/2£448
Mon 20/415:30
PDX
-
LHR
1 stop12h 25m
Icelandair
Fri 1/513:05
LHR
-
PDX
1 stop12h 55m
Icelandair
Deal found 2/2£449
Tue 28/415:15
PDX
-
LHR
1 stop14h 05m
Lufthansa
Tue 5/507:25
LHR
-
PDX
2 stops21h 44m
Lufthansa
Deal found 1/2£450
Mon 4/515:30
PDX
-
LHR
1 stop12h 25m
Icelandair
Thu 14/521:25
LHR
-
PDX
1 stop28h 35m
Icelandair
Deal found 1/2£451

Find flight deals from Portland to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Portland (PDX) to Heathrow (LHR). 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 3 February 2026.

Round-trip from

£439

One-way from

£208

Popular in

June

Cheapest in

October

Average price

£513

Good round-trip deal

£1,336 or less

Good one-way deal

£3,113 or less
Icelandair
  • Icelandair
  • 7/4-24/4
  • 2 total stops
  • 25h 20m total
  • Portland to London
Search Deals
4/5
  • 4/5
  • 2 total stops
  • 21h 50m total
  • Portland to London
Search Deals
Highest demand for flights based on searches. 23% potential increase in price (£136 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (£24 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals
Price to beat on a round-trip flight from Portland to London Heathrow.
Search Deals
Price to beat on a one-way flight from Portland to London Heathrow.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portland to Heathrow 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 3 February 2026.
Use the filters below to find and compare flights from Portland to London Heathrow Airport that are best for you.

Fly from

Portland

Fly to

Heathrow

Route

Depart

Return

Price

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 11/3

05:30-07:25

1 stop18h 55m

London Heathrow

Wed 25/3

13:45-23:04

1 stop16h 19m

£475

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 17/3

19:49-21:20

2 stops18h 31m

London Heathrow

Tue 31/3

17:50-20:42

2 stops34h 52m

£477

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 13/4

15:15-13:20

1 stop14h 05m

London Heathrow

Thu 30/4

14:05-15:03

2 stops32h 58m

£480

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 1/3

15:15-11:50

1 stop12h 35m

London Heathrow

Wed 11/3

12:05-23:11

1 stop18h 06m

£482

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 18/3

13:39-16:50

2 stops20h 11m

London Heathrow

Tue 7/4

09:00-00:44

2 stops23h 44m

£491

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 1/4

05:00-09:35

2 stops20h 35m

London Heathrow

Fri 10/4

12:05-11:44

2 stops31h 39m

£493

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 26/4

19:05-13:20

1 stop34h 15m

London Heathrow

Wed 6/5

11:25-21:09

1 stop17h 44m

£494

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 17/3

11:40-09:00

1 stop14h 20m

London Heathrow

Fri 3/4

08:40-19:25

2 stops18h 45m

£497

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 13/5

05:20-07:25

1 stop18h 05m

London Heathrow

Wed 20/5

11:05-18:45

1 stop15h 40m

£497

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sat 9/5

23:55-06:45

1 stop22h 50m

London Heathrow

Tue 19/5

11:25-17:44

1 stop14h 19m

£497

Flights are sorted by cheapest return flights first.

Deals found on 1/2

Showing 1-10 of 23 results
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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

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

Use this chart to determine the optimal time to book a return flight from Portland to Heathrow. Price data was last updated on 30 January 2026.

The best time to book flights from Portland to London Heathrow Airport is 86 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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

Currently, December is the cheapest month in which you can book a flight from Portland to London Heathrow Airport (average of £378). Flying from Portland to London Heathrow Airport in June is currently the most expensive (average of £602). 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

Get insights into the airlines that provide service to Heathrow. 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 Heathrow. Reviews last updated 3 February 2026.
Get a feel of what it's like to fly with Icelandair, Iberia, andBritish Airways from Portland to London Heathrow Airport by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Icelandair
7.1
Good
606 reviews
Check prices

Boarding

7.2

Entertainment

7.0

Overall

7.1

Food

6.2

Comfort

7.0

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Nov 2025

AMS - KEF

We paid a total of 328.00 for specific seats and we were not assigned to any of the seats for which we paid.
Icelandair
7.1
Good
606 reviews
Icelandair
7.1
Good
606 reviews
Check prices

Boarding

7.2

Entertainment

7.0

Overall

7.1

Food

6.2

Comfort

7.0

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Nov 2025

AMS - KEF

We paid a total of 328.00 for specific seats and we were not assigned to any of the seats for which we paid.
Iberia
7.0
Good
3,102 reviews
Icelandair
7.1
Good
606 reviews
Check prices

Boarding

7.2

Entertainment

7.0

Overall

7.1

Food

6.2

Comfort

7.0

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Nov 2025

AMS - KEF

We paid a total of 328.00 for specific seats and we were not assigned to any of the seats for which we paid.
British Airways
6.7
Okay
7,711 reviews
Icelandair
7.1
Good
606 reviews
Check prices

Boarding

7.2

Entertainment

7.0

Overall

7.1

Food

6.2

Comfort

7.0

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Nov 2025

AMS - KEF

We paid a total of 328.00 for specific seats and we were not assigned to any of the seats for which we paid.

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?

    Portland (PDX), located 6.0 mi from the city center, is the airport you fly out of when you book flights from Portland to London Heathrow. 3 airlines have flights from Portland to London Heathrow on a regular basis. Booking flights from Portland to London Heathrow should not be difficult; the airport handles an average of 0 outbound flights to London Heathrow per day.

  • How long is the flight from Portland to London Heathrow Airport?

    For as low as £475, United Airlines can have you in London Heathrow Airport from Portland in 18h 55m. The distance between Portland and London Heathrow Airport is about 4896 mi.

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

    According to our current data, British Airways (£376), Iberia (£424), and Icelandair (£431) offers the cheapest pricing from Portland to London Heathrow Airport. These flights start at 38% lower than the current average price 3 months from now.

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

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Portland to London Heathrow Airport on time: American Airlines (77%), Alaska Airlines (77%), Aer Lingus (77%).

  • What are the cheapest flights from Portland to London Heathrow Airport?

    On average you can expect to pay £2,233 for a flight from Portland to London Heathrow Airport. The cheapest flight overall is £1,335 while the most popular route, (Portland - London Heathrow) is currently priced at £371.

  • 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 to London Heathrow Airport?

    Currently, December is the cheapest month in which you can book a flight from Portland to London Heathrow Airport (average of £378). Flying from Portland to London Heathrow Airport in June is currently the most expensive (average of £602). 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

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Croydon
Luton
Northampton
Wembley
Gatwick
Slough
Ilford
Hounslow
Brentford
Hayes
Colchester
Watford
Guildford
Swindon
Bedford
Chelmsford
Eastbourne
Crawley
Kingston upon Thames

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.

Top 3 airlines flying from Portland to Heathrow

Discover the top 3 airlines that operate flights from Portland to Heathrow. 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 3 February 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£376Average£529FlexibilityNo cancel feeOn-time70%
Search British Airways flights
IberiaCheapest£424Average£508FlexibilityNo cancel feeOn-time77%
Search Iberia flights
IcelandairCheapest£431Average£439FlexibilityNo cancel feeOn-time76%
Search Icelandair flights

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?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Portland to Heathrow. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Heathrow from Portland.

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Portland to Heathrow flexibly with Cheapflights today.

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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