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Cheap flights from London Heathrow Airport to Portsmouth from £127

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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
19 Jan — 26 Jan1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Portsmouth

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Portsmouth
Explore the most affordable flight options available from Heathrow to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 20 December 2025.

Wed 24/1207:00LHR - SOU
1 stop3h 55mBritish Airways
Mon 12/118:05SOU - LHR
1 stop3h 25mBritish Airways
Deal found 19/12£375
Wed 24/1207:00LHR - SOU
1 stop3h 55mBritish Airways
Sun 4/113:40SOU - LHR
1 stop4h 25mBritish Airways
Deal found 19/12£504
Sun 28/1210:40LHR - SOU
1 stop7h 20mBritish Airways
Tue 30/1212:40SOU - LHR
1 stop6h 40mBritish Airways
Deal found 19/12£599
Wed 24/1207:00LHR - SOU
1 stop3h 55mBritish Airways
Sat 27/1216:00SOU - LHR
1 stop4h 40mBritish Airways
Deal found 18/12£767

Find flight deals from Heathrow to Portsmouth

Keep the following information in mind while searching for Heathrow to Portsmouth flight deals. Data was last updated 20 December 2025.

Round-trip from

£215

One-way from

£127
27/2-28/2
  • 27/2-28/2
  • 2 total stops
  • 17h 15m total
  • London to Portsmouth
Search Deals
3/2
  • 3/2
  • 1 total stop
  • 10h 50m total
  • London to Portsmouth
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Portsmouth that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 20 December 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Portsmouth that are best for you.

Fly from

Heathrow

Fly to

Portsmouth

Route

Depart

Return

Price

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 27/2

19:30-06:45

1 stop11h 15m

Southampton Eastleigh

Sat 28/2

15:25-21:25

1 stop6h 00m

£215

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Thu 28/5

11:45-16:50

1 stop5h 05m

Southampton Eastleigh

Sun 7/6

09:15-20:55

1 stop11h 40m

£223

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Mon 2/2

07:00-11:50

1 stop4h 50m

Southampton Eastleigh

Mon 9/2

12:20-20:45

1 stop8h 25m

£245

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 16/1

15:10-19:40

1 stop4h 30m

Southampton Eastleigh

Fri 23/1

20:10-09:05

1 stop12h 55m

£253

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Thu 5/2

11:45-17:05

1 stop5h 20m

Southampton Eastleigh

Mon 9/2

09:25-20:50

1 stop11h 25m

£259

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 16/1

20:25-08:45

1 stop12h 20m

Southampton Eastleigh

Fri 23/1

17:35-07:40

1 stop14h 05m

£259

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sun 4/1

20:45-08:45

1 stop12h 00m

Southampton Eastleigh

Thu 8/1

20:10-08:05

1 stop11h 55m

£265

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sat 17/1

14:45-19:20

1 stop4h 35m

Southampton Eastleigh

Sat 24/1

10:20-18:05

1 stop7h 45m

£274

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 2/1

21:10-12:05

1 stop14h 55m

Southampton Eastleigh

Fri 9/1

08:45-17:55

1 stop9h 10m

£301

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 2/1

21:10-12:05

1 stop14h 55m

Southampton Eastleigh

Tue 6/1

08:45-11:50

1 stop3h 05m

£301

Flights are sorted by cheapest return flights first.

Deals found on 20/12

Showing 1-10 of 16 results
1
2

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.
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 London Heathrow Airport to Portsmouth

What is the cheapest time of day to fly from LHR to P0R?

Find hourly flight availability from Heathrow to Portsmouth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 20 December 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London Heathrow Airport to Portsmouth as you normally would.

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.

  • How long is the flight from London Heathrow Airport to Portsmouth?

    A quick flight from London Heathrow Airport to Portsmouth can take about 4h 30m. KLM provides one of the quickest options available for as low as £253. The distance from London Heathrow Airport to Portsmouth is about 53 mi. This flight may include one or multiple stops.

  • Can I find deals for flights from Heathrow to Portsmouth that include hotel bookings?

    Yes. In addition to deals on Heathrow to Portsmouth flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Portsmouth?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Portsmouth.

  • Can I find deals for business class flights from Heathrow to Portsmouth?

    Yes. Cheapflights offers flight deals from Heathrow to Portsmouth by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Heathrow to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
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Fly with Cheapflights

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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?

Cheapflights simply makes it quick and affordable to book flights from Heathrow to Portsmouth by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Heathrow to Portsmouth with no change fees?

Need flexible booking options for your flight to Portsmouth from Heathrow? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Heathrow to Portsmouth become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Portsmouth from Heathrow today and book when prices fit your budget.

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