Cheap flights from London Heathrow Airport to Portsmouth, New Hampshire
Cheap flight deals from Heathrow to Portsmouth
Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Portsmouth (PSM). 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 4 July 2025.
Popular in | August |
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Cheapest in | September |
Average price | £544 |
Best time to book a flight from Heathrow to Portsmouth
Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Heathrow with our price prediction graph.
Related info for your journey
Find useful and relevant information for your journey from Heathrow to Portsmouth. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Heathrow to Portsmouth
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How does Cheapflights help users find flights from Heathrow to Portsmouth?
900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Portsmouth from Heathrow today with Cheapflights!
Why should you use Cheapflights to find cheap flight tickets from Heathrow to Portsmouth?
It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Heathrow to Portsmouth.
Can Cheapflights find flights from Heathrow to Portsmouth with no change fees?
Cheapflights does show flights with no change fees to all users. To see these options for flights from Heathrow to Portsmouth, users can toggle the no change fees filter when performing a flight search.
Can Cheapflights notify me if prices for flights from Heathrow to Portsmouth become cheaper?
Of course! You can now track prices for flights from Heathrow to Portsmouth and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.