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Cheap flights from London Heathrow Airport to Portsmouth from £85

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 26/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
1 Sep — 8 Sep1
1 adult

Cheap flight deals from Heathrow to Portsmouth

Keep the following information in mind while searching for Heathrow to Portsmouth flight deals. Data was last updated 27 August 2025.

Round-trip from

£176

One-way from

£85
19/9-26/9
  • 19/9-26/9
  • 2 total stops
  • 22h 40m total
  • London to Portsmouth
Search Deals
26/9
  • 26/9
  • 1 total stop
  • 3h 50m total
  • London to Portsmouth
Search Deals

Find flight deals from Heathrow to Portsmouth

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 27 August 2025.

Fri 19/915:05LHR - SOU
1 stop3h 50mMultiple Airlines
Fri 26/919:25SOU - LHR
1 stop18h 50mMultiple Airlines
Deal found 25/8£176
Sun 14/915:05LHR - SOU
1 stop16h 30mMultiple Airlines
Mon 29/908:05SOU - LHR
1 stop6h 10mMultiple Airlines
Deal found 25/8£185
Tue 7/1007:30LHR - SOU
1 stop7h 45mMultiple Airlines
Tue 14/1015:45SOU - LHR
1 stop5h 55mMultiple Airlines
Deal found 24/8£216
Wed 17/907:40LHR - SOU
1 stop11h 50mMultiple Airlines
Fri 19/919:25SOU - LHR
1 stop18h 50mMultiple Airlines
Deal found 26/8£220
Sat 11/1006:30LHR - SOU
1 stop11h 00mKLM
Sun 12/1009:20SOU - LHR
1 stop10h 10mKLM
Deal found 25/8£230
Thu 2/1020:55LHR - SOU
1 stop11h 50mKLM
Wed 8/1009:20SOU - LHR
1 stop10h 05mKLM
Deal found 25/8£244
Sun 21/920:55LHR - SOU
1 stop11h 50mKLM
Sun 28/909:20SOU - LHR
1 stop11h 35mKLM
Deal found 24/8£258
Wed 24/909:15LHR - SOU
1 stop6h 00mMultiple Airlines
Wed 1/1008:55SOU - LHR
1 stop6h 15mMultiple Airlines
Deal found 25/8£260
Sat 11/1007:30LHR - SOU
1 stop4h 25mBritish Airways
Wed 15/1015:45SOU - LHR
1 stop3h 50mBritish Airways
Deal found 25/8£333

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 27 August 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 19/9

15:05-18:55

1 stop3h 50m

Southampton Eastleigh

Fri 26/9

19:25-14:15

1 stop18h 50m

£176

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sun 14/9

15:05-07:35

1 stop16h 30m

Southampton Eastleigh

Mon 29/9

08:05-14:15

1 stop6h 10m

£185

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Tue 7/10

07:30-15:15

1 stop7h 45m

Southampton Eastleigh

Tue 14/10

15:45-21:40

1 stop5h 55m

£216

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Wed 17/9

07:40-19:30

1 stop11h 50m

Southampton Eastleigh

Fri 19/9

19:25-14:15

1 stop18h 50m

£220

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sat 11/10

06:30-17:30

1 stop11h 00m

Southampton Eastleigh

Sun 12/10

09:20-19:30

1 stop10h 10m

£230

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 16/1

17:20-08:25

1 stop15h 05m

Southampton Eastleigh

Fri 23/1

08:55-20:55

1 stop12h 00m

£240

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Thu 2/10

20:55-08:45

1 stop11h 50m

Southampton Eastleigh

Wed 8/10

09:20-19:25

1 stop10h 05m

£244

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 26/9

15:05-18:55

1 stop3h 50m

£85

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 3/10

15:05-18:55

1 stop3h 50m

£87

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Wed 24/9

13:55-08:25

1 stop18h 30m

£137

Flights are sorted by cheapest return flights first.

Deals found on 24/8

Showing 1-10 of 19 results
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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 27 August 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 11h. KLM provides one of the quickest options available for as low as £230. The distance from London Heathrow Airport to Portsmouth is about 53 mi.

  • 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.

  • What is the cheapest month to book a flight from London Heathrow Airport to Portsmouth?

    Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Portsmouth (average of £112). Flying from London Heathrow Airport to Portsmouth in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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?

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Why should you use Cheapflights to find cheap flight tickets from Heathrow to Portsmouth?

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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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