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

Seattle (SEA) is the most affordable one-stop option, with an average return flight price of £727.

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

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

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

Flights via Seattle (SEA) offer the fastest connection on this route, with an average stopover time of 1h 37m.

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

Reykjavik (KEF) – chosen by Cheapflights users on 53% of one-stop itineraries from Portland to London Heathrow Airport on Cheapflights.

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

For as low as £400, United Airlines can have you in London Heathrow Airport from Portland in 16h 35m. The distance between Portland and London Heathrow Airport is about 4896 mi. This flight may include one or multiple stops.

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

According to our current data, British Airways (£377), Icelandair (£432), and Iberia (£447) 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 cheapest airlines to fly from Portland to London Heathrow Airport one-way?

For one-way options, check prices for Scandinavian Airlines. According to our data, you can fly for as low as £263. Users have also found prices from £289 and £289 on United Airlines and Air Canada, respectively.

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

Travellers seeking maximum savings on their Portland to London Heathrow Airport flight should consider departing on Friday evenings when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Portland to London Heathrow Airport

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

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

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 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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

On average you can expect to pay £1,343 for a flight from Portland to London Heathrow Airport. The cheapest flight overall is £374 while the most popular route, (Portland - London Heathrow) is currently priced at £345.

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 most popular airlines that fly from Portland to London Heathrow Airport?

Consider British Airways, Icelandair or Iberia when booking your flight. These represent the most popular airlines when flying from Portland to London Heathrow Airport.

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 7 outbound flights to London Heathrow per day.

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.

£263+ Flights from Portland to London Heathrow Airport

Q: How much does it cost for a return flight from Portland to London Heathrow Airport?

Airfare is below average for this route at the moment. Portland to London Heathrow Airport flights typically cost between £490 and £653 in October. The cheapest return flight price found within the last 3 days was £400 on United Airlines (22 Oct-29 Oct).

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 Friday or Tuesday and return on a Wednesday

Cheap flight deals from Portland to Heathrow

Round-trip from	£400
One-way from	£263
Popular in	June
Cheapest in	October
Average price	£547
Good round-trip deal	£434 or less
Good one-way deal	£3,122 or less

United Airlines
22/10-29/10
3 total stops
58h 30m total
Portland to London

Search Deals

Scandinavian Airlines
26/10
2 total stops
28h 17m total
Portland to London

Search Deals

Highest demand for flights based on searches. 23% potential increase in price (£141 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 September 2025

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

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 16 September 2025.

Wed 22/1015:15PDX - LHR

1 stop15h 00mKLM

Wed 29/1006:30LHR - PDX

1 stop12h 55mKLM

Deal found 16/9£400

Sun 2/1117:45PDX - LHR

Nonstop9h 35mBritish Airways

Wed 19/1113:45LHR - PDX

Nonstop10h 10mBritish Airways

Deal found 15/9£400

Wed 19/1115:15PDX - LHR

1 stop12h 35mAir Canada

Thu 27/1114:30LHR - PDX

1 stop32h 15mAir Canada

Deal found 16/9£401

Mon 6/1016:07PDX - LHR

1 stop12h 13mUnited Airlines

Wed 22/1014:10LHR - PDX

1 stop16h 51mUnited Airlines

Deal found 14/9£402

Fri 3/1019:35PDX - LHR

2 stops54h 05mUnited Airlines

Thu 16/1014:10LHR - PDX

1 stop32h 36mUnited Airlines

Deal found 13/9£403

Wed 24/916:07PDX - LHR

1 stop12h 13mUnited Airlines

Wed 1/1007:45LHR - PDX

2 stops20h 35mUnited Airlines

Deal found 14/9£403

Wed 1/1007:02PDX - LHR

1 stop20h 33mUnited Airlines

Wed 8/1014:10LHR - PDX

1 stop32h 36mUnited Airlines

Deal found 16/9£404

Mon 6/1019:25PDX - LHR

Nonstop9h 35mBritish Airways

Wed 22/1008:20LHR - PDX

1 stop16h 44mBritish Airways

Deal found 14/9£405

Thu 20/1114:45PDX - LHR

1 stop20h 45mIcelandair

Sat 6/1220:35LHR - PDX

1 stop28h 25mIcelandair

Deal found 14/9£405

Mon 6/1011:10PDX - LHR

1 stop19h 05mDelta

Wed 22/1006:15LHR - PDX

2 stops18h 30mDelta

Deal found 16/9£406

Tue 23/911:18PDX - LHR

1 stop13h 47mBritish Airways

Tue 14/1015:10LHR - PDX

1 stop16h 19mBritish Airways

Deal found 14/9£407

Best flights from Portland to Heathrow
Discover carefully curated flight deals from Portland to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 September 2025.

Tue 14/1015:50PDX - LHR

2 stops35h 20mUnited Airlines

Tue 4/1114:30LHR - PDX

1 stop32h 15mUnited Airlines

Deal found 16/9£400

Sun 5/1013:40PDX - LHR

1 stop16h 35mVirgin Atlantic

Tue 14/1019:15LHR - PDX

1 stop24h 05mVirgin Atlantic

Deal found 16/9£400

Mon 9/206:15PDX - LHR

1 stop16h 50mKLM

Wed 18/206:30LHR - PDX

1 stop12h 55mKLM

Deal found 14/9£405

Thu 20/1114:45PDX - LHR

1 stop20h 45mIcelandair

Thu 4/1220:35LHR - PDX

1 stop28h 25mIcelandair

Deal found 14/9£405

Mon 6/1011:10PDX - LHR

1 stop19h 05mDelta

Wed 22/1006:15LHR - PDX

2 stops18h 30mDelta

Deal found 16/9£406

Mon 6/1015:50PDX - LHR

2 stops35h 20mUnited Airlines

Wed 22/1014:10LHR - PDX

1 stop27h 10mUnited Airlines

Deal found 16/9£400

Wed 8/1013:30PDX - LHR

2 stops16h 20mDelta

Thu 16/1011:30LHR - PDX

2 stops20h 27mDelta

Deal found 15/9£429

Wed 8/1005:30PDX - LHR

2 stops21h 40mUnited Airlines

Wed 22/1014:10LHR - PDX

1 stop16h 51mUnited Airlines

Deal found 15/9£404

Mon 2/309:50PDX - LHR

1 stop18h 00mUnited Airlines

Mon 16/311:05LHR - PDX

2 stops40h 20mUnited Airlines

Deal found 13/9£410

Wed 15/1005:30PDX - LHR

1 stop24h 40mUnited Airlines

Mon 3/1114:30LHR - PDX

1 stop26h 45mUnited Airlines

Deal found 16/9£432

Direct flights from Portland to Heathrow
Explore direct flight options from Portland to Heathrow based on user searches, and compare prices and availability for your desired travel dates. Data last updated 16 September 2025.

Tue 21/1019:25PDX - LHR

Nonstop9h 35mBritish Airways

Fri 31/1013:45LHR - PDX

Nonstop10h 10mBritish Airways

Deal found 15/9£400

Wed 29/1018:45PDX - LHR

Nonstop9h 35mBritish Airways

Wed 5/1113:45LHR - PDX

Nonstop10h 10mBritish Airways

Deal found 14/9£401

Mon 6/1019:25PDX - LHR

Nonstop9h 35mAmerican Airlines

Wed 22/1015:40LHR - PDX

Nonstop9h 55mAmerican Airlines

Deal found 14/9£402

Mon 16/217:45PDX - LHR

Nonstop9h 35mBritish Airways

Sun 22/213:45LHR - PDX

Nonstop10h 10mBritish Airways

Deal found 14/9£433

Thu 16/1019:25PDX - LHR

Nonstop9h 35mBritish Airways

Thu 23/1015:40LHR - PDX

Nonstop9h 55mBritish Airways

Deal found 16/9£433

Wed 22/1019:25PDX - LHR

Nonstop9h 35mBritish Airways

Sun 2/1113:45LHR - PDX

Nonstop10h 10mBritish Airways

Deal found 15/9£437

Mon 16/217:45PDX - LHR

Nonstop9h 35mBritish Airways

Mon 23/213:45LHR - PDX

Nonstop10h 10mBritish Airways

Deal found 16/9£438

Tue 14/1019:25PDX - LHR

Nonstop9h 35mBritish Airways

Wed 5/1113:45LHR - PDX

Nonstop10h 10mBritish Airways

Deal found 16/9£466

Wed 15/1019:25PDX - LHR

Nonstop9h 35mAmerican Airlines

Wed 22/1015:40LHR - PDX

Nonstop9h 55mAmerican Airlines

Deal found 14/9£467

Thu 16/1019:25PDX - LHR

Nonstop9h 35mBritish Airways

Mon 3/1113:45LHR - PDX

Nonstop10h 10mBritish Airways

Deal found 14/9£469

Sun 2/1117:45PDX - LHR

Nonstop9h 35mBritish Airways

Fri 21/1113:45LHR - PDX

Nonstop10h 10mBritish Airways

Deal found 15/9£470

Mon 17/1117:45PDX - LHR

Nonstop9h 35mBritish Airways

Wed 26/1113:45LHR - PDX

Nonstop10h 10mBritish Airways

Deal found 16/9£471

Last-minute flights from Portland to Heathrow
Discover last-minute flight deals from Portland to Heathrow. Data last updated 16 September 2025 and is based on user searches.

Sun 21/915:20PDX - LHR

1 stop12h 35mIcelandair

Tue 30/921:25LHR - PDX

1 stop28h 30mIcelandair

Deal found 16/9£404

Mon 22/907:15PDX - LHR

1 stop16h 00mDelta

Fri 3/1011:30LHR - PDX

2 stops19h 12mDelta

Deal found 16/9£405

Tue 23/905:30PDX - LHR

2 stops20h 05mAir Canada

Tue 30/910:15LHR - PDX

2 stops20h 46mAir Canada

Deal found 14/9£400

Tue 23/919:35PDX - LHR

2 stops26h 55mAir Canada

Thu 2/1014:05LHR - PDX

2 stops16h 56mAir Canada

Deal found 16/9£401

Tue 23/911:18PDX - LHR

1 stop13h 47mBritish Airways

Tue 14/1015:10LHR - PDX

1 stop16h 19mBritish Airways

Deal found 14/9£407

Tue 23/908:30PDX - LHR

1 stop13h 50mUnited Airlines

Tue 30/908:30LHR - PDX

2 stops23h 58mUnited Airlines

Deal found 16/9£411

Tue 23/911:08PDX - LHR

2 stops18h 37mDelta

Tue 30/912:25LHR - PDX

1 stop16h 40mDelta

Deal found 16/9£426

Wed 24/916:07PDX - LHR

1 stop12h 13mUnited Airlines

Wed 1/1007:45LHR - PDX

2 stops20h 35mUnited Airlines

Deal found 14/9£403

Wed 24/905:38PDX - LHR

1 stop23h 07mBritish Airways

Wed 1/1012:00LHR - PDX

1 stop17h 27mBritish Airways

Deal found 15/9£411

Fri 26/912:59PDX - LHR

1 stop34h 41mUnited Airlines

Tue 7/1014:10LHR - PDX

1 stop27h 10mUnited Airlines

Deal found 15/9£433

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 16 September 2025.

Sun 26/1010:23PDX - LHR

2 stops28h 17mScandinavian Airlines

Deal found 14/9£263

Wed 8/1006:15PDX - LHR

3 stops21h 50mMultiple Airlines

Deal found 14/9£265

Sat 28/207:20PDX - LHR

2 stops21h 30mMultiple Airlines

Deal found 15/9£269

Wed 1/1007:15PDX - LHR

3 stops30h 45mMultiple Airlines

Deal found 14/9£271

Sat 4/1013:45PDX - LHR

3 stops41h 10mMultiple Airlines

Deal found 15/9£272

Tue 30/911:03PDX - LHR

3 stops41h 02mMultiple Airlines

Deal found 14/9£273

Sun 28/909:28PDX - LHR

3 stops53h 27mMultiple Airlines

Deal found 14/9£274

Mon 22/910:30PDX - LHR

2 stops19h 45mMultiple Airlines

Deal found 16/9£274

Sun 26/1015:15PDX - LHR

1 stop13h 35mAir Canada

Deal found 15/9£275

Sun 1/310:40PDX - LHR

2 stops18h 10mMultiple Airlines

Deal found 15/9£284

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

PDX - LHR

PDXLHR

Portland

Tue 14/10

15:50-11:10

2 stops35h 20m

London Heathrow

Tue 4/11

14:30-14:45

1 stop32h 15m

£400

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 5/10

13:40-14:15

1 stop16h 35m

London Heathrow

Tue 14/10

19:15-11:20

1 stop24h 05m

£400

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 6/10

15:50-11:10

2 stops35h 20m

London Heathrow

Wed 22/10

14:10-09:20

1 stop27h 10m

£400

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 8/10

05:30-11:10

2 stops21h 40m

London Heathrow

Wed 22/10

14:10-23:01

1 stop16h 51m

£404

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 9/2

06:15-07:05

1 stop16h 50m

London Heathrow

Wed 18/2

06:30-11:25

1 stop12h 55m

£405

PortlandLondon

PDX - LHR

PDXLHR

Portland

Thu 20/11

14:45-19:30

1 stop20h 45m

London Heathrow

Thu 4/12

20:35-17:00

1 stop28h 25m

£405

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 6/10

11:10-14:15

1 stop19h 05m

London Heathrow

Wed 22/10

06:15-16:45

2 stops18h 30m

£406

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 2/3

09:50-11:50

1 stop18h 00m

London Heathrow

Mon 16/3

11:05-20:25

2 stops40h 20m

£410

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 8/10

13:30-13:50

2 stops16h 20m

London Heathrow

Thu 16/10

11:30-23:57

2 stops20h 27m

£429

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 15/10

05:30-14:10

1 stop24h 40m

London Heathrow

Mon 3/11

14:30-09:15

1 stop26h 45m

£432

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 20 results

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

Prices

Airlines

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

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, January is the cheapest month in which you can book a flight from Portland to London Heathrow Airport (average of £112). Flying from Portland to London Heathrow Airport in August is currently the most expensive (average of £164). 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 LHR?

One of the essential ways to save on airfare from Portland to London Heathrow Airport is to remain as flexible as possible. Flights that are at midday tend to be the most expensive. A flight in the evening could potentially save you up to 27% on airfare.

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

Reviews of airlines servicing Heathrow

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

7.0

Good

544 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Aug 2025

GVA - KEF

Terrible customer service when dealing with phone representatives. Baggage was lost.

Icelandair

7.0

Good

544 reviews

Icelandair

7.0

Good

544 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Aug 2025

GVA - KEF

Terrible customer service when dealing with phone representatives. Baggage was lost.

Iberia

7.0

Good

2,924 reviews

Icelandair

7.0

Good

544 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Aug 2025

GVA - KEF

Terrible customer service when dealing with phone representatives. Baggage was lost.

British Airways

6.7

Okay

7,363 reviews

Icelandair

7.0

Good

544 reviews

Check prices

Reviews

1 / 20

6.0

Good

Anonymous,Aug 2025

GVA - KEF

Terrible customer service when dealing with phone representatives. Baggage was lost.

Related info for your journey

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 7 outbound flights to London Heathrow per day.
How long is the flight from Portland to London Heathrow Airport?
For as low as £400, United Airlines can have you in London Heathrow Airport from Portland in 16h 35m. The distance between Portland and London Heathrow Airport is about 4896 mi. This flight may include one or multiple stops.
What are the cheapest airlines flying from Portland to London Heathrow Airport round-trip?
According to our current data, British Airways (£377), Icelandair (£432), and Iberia (£447) 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 cheapest airlines to fly from Portland to London Heathrow Airport one-way?
For one-way options, check prices for Scandinavian Airlines. According to our data, you can fly for as low as £263. Users have also found prices from £289 and £289 on United Airlines and Air Canada, respectively.
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 £1,343 for a flight from Portland to London Heathrow Airport. The cheapest flight overall is £374 while the most popular route, (Portland - London Heathrow) is currently priced at £345.
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, January is the cheapest month in which you can book a flight from Portland to London Heathrow Airport (average of £112). Flying from Portland to London Heathrow Airport in August is currently the most expensive (average of £164). 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 3 airlines flying from Portland to Heathrow

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest£377	Average£530	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Icelandair	Cheapest£432	Average£441	FlexibilityNo cancel fee	On-time76%	Search Icelandair flights
Iberia	Cheapest£447	Average£537	FlexibilityNo cancel fee	On-time77%	Search Iberia flights

Fly with Cheapflights

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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Cheap flights from Portland to London Heathrow Airport from £263

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 26/10. Fares are subject to change and may not be available on all flights or dates of travel.

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 Friday or Tuesday and return on a Wednesday

Cheap flight deals from Portland to Heathrow

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

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 16 September 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 16 September 2025.

Cheapflights Fare Finder

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

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

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

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

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

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

Weekly flight availability from Portland to London Heathrow Airport

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

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

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

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

Reviews of airlines servicing Heathrow

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.

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?

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

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What are the cheapest airlines to fly from Portland to London Heathrow Airport one-way?

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

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

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Travelling to a place near London Heathrow Airport?

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Alternative routes for Portland to Heathrow

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Top 3 airlines flying from Portland to Heathrow

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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 16 September 2025.