Question 1

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

Accepted Answer

In the last 3 days, the lowest price for a flight from Portland to London Heathrow Airport was £228 for a one-way ticket and £529 for a return. <a href='/flight-routes/Portland-PWM/London-Heathrow-LHR'>Visit our flight page for the latest deals!>/a>

Question 2

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

Accepted Answer

Portland and London are both served by 1 main airport. You will leave Portland from Portland and will be arriving at London Heathrow. <a href='/flight-routes/Portland-PWM/London-Heathrow-LHR'>Visit our flight page for the latest deals!>/a>

Question 3

Which aircraft models fly most regularly from Portland to London?

Accepted Answer

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

Question 4

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

Accepted Answer

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. <a href='/flight-routes/Portland-PWM/London-Heathrow-LHR'>Visit our flight page for the latest deals!>/a>

Question 5

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

Accepted Answer

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 travellers know whether to wait or book now. <a href='/flight-routes/Portland-PWM/London-Heathrow-LHR'>Visit our flight page for the latest deals!>/a>

Question 6

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

Accepted Answer

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 with an airline and back to Portland with another airline. <a href='/flight-routes/Portland-PWM/London-Heathrow-LHR'>Visit our flight page for the latest deals!>/a>

Question 7

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

Accepted Answer

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. <a href='/flight-routes/Portland-PWM/London-Heathrow-LHR'>Visit our flight page for the latest deals!>/a>

Question 8

Which airlines provide the cheapest flights from Portland to London?

Accepted Answer

In the past 3 days, the cheapest return tickets from Portland to London were found on United Airlines (£529) and Scandinavian Airlines (£630).

Question 9

Which airlines provide the cheapest flights from Portland to London?

Accepted Answer

In the past 3 days, the cheapest return tickets from Portland to London were found on United Airlines (£529) and Scandinavian Airlines (£630).

Question 10

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

Accepted Answer

Flight prices are below average for this route right now.Flights to London Heathrow Airport from Portland, Maine usually cost between £786 and £612 in August.
The lowest price found in the past 3 days was £529 on United Airlines (24 Aug-25 Aug).

Question 11

What are the most popular airlines flying to Heathrow?

Accepted Answer

The most popular airline among KAYAK users flying to Heathrow is Virgin Atlantic, followed by British Airways and Iberia.

Low season	October
High season	April
Cheapest flight	£228

PWM - LHR

£228 Find Cheap Flights from Portland to London

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

Everything you should know

Cheap Flights from Portland to Heathrow (PWM-LHR)

Recent return flight deals from Portland to Heathrow

Recent one-way flight deals from Portland to Heathrow

Recent last minute flight deals from Portland to Heathrow

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, Maine to London Heathrow Airport?

Which airlines provide the cheapest flights from Portland to London?

In the past 3 days, the cheapest return tickets from Portland to London were found on United Airlines (£529) and Scandinavian Airlines (£630).

Good to know - Cheap tickets from Portland to London

When to book flights from Portland to Heathrow

FAQs for booking Portland to London 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 £228 for a one-way ticket and £529 for a return.

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

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

Which aircraft models fly most regularly from Portland to London?

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

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 travellers 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 return 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.

Everything you need to know for your flight from Portland to Heathrow

Information on your arrival and departure airports

Cabin class types available on flights to Heathrow

Complete your trip to London with a hotel stay or car hire

Find direct flights to and from Portland and Heathrow

Flights to other popular destinations

Flights from domestic origins to Heathrow

Choose which airport to fly into in London

Find deals for your return flight