Search for cheap flights and last-minute deals with Netflights. We've scanned all the flights from London Heathrow to Portland Maine, across the four airlines that offer this route. We've found that 08 / Sep / 2025 is the cheapest date to travel at the moment, but it's best to go through the results to see which flight suits you.
The most popular airlines offering flights to Portland Maine are British Airways, Aer Lingus & Virgin Atlantic. British Airways is the most popular one, but that doesn’t mean their flights will be the cheapest. If you can't find a flight time that suits you, why not look at flying out from a different airport?
The distance between London Heathrow to Portland Maine is 5114 km. Normally, it takes about 13 hrs 35 mins to fly, and you can definitely expect the journey to be at least 11 hrs 40 mins. You can see the various flight times in the results.
Searching by month, for instance, will show you the best time of the week to fly.
