Cheap flights from Portland to London from £174

The cheapest month to fly to London from Portland is in January. Flight prices, which tend to average around £524, are often lower during this time because this is during the off-season. The month of February is another great option to travel to London, with average flight prices from Portland averaging around £527.

Our data shows that Monday is the least expensive day to fly to London. Tickets to fly out on this day can be as low as £616. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Portland to London for around £849.

The cheapest time of day to fly to London is in the afternoon when flights can be purchased for as low as £522. Flights in the evening are often more expensive, with an average ticket price of £816.

Fly from Portland to London Heathrow for the best Portland - London flight prices

You are more likely to see cheaper flights to London from Portland when booking weeks ahead of your departure date. In general, you can expect to find flights to London for around £695 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London from Portland for as low as £648 on momondo.

There are 2 cabin classes available to choose from on Portland to London flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 9% on your flight if you consider stops on a Portland to London flight.

As of August 2026, prices for Portland to London flights are approximately 23% cheaper when compared to flights at the same time last year.

As of August 2026, 6 flights take off from Portland and land in London each day. The most common flight departure time for this route is 19:00, with 100% of daily flights taking off in the evening.

As of August 2026, 43 flights take off from Portland and land in London each week. The most common flight departure day for this route is Tue, with 16% of weekly flights taking off on this day.