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Cheap flights from London Heathrow Airport to Portsmouth from £93

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 17/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
18 Apr — 25 Apr1
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 19 March 2026.

Thu 23/420:50
LHR
-
SOU
1 stop11h 55m
Multiple Airlines
Mon 27/419:20
SOU
-
LHR
1 stop13h 50m
Multiple Airlines
Deal found 16/3£149
Thu 16/420:50
LHR
-
SOU
1 stop11h 55m
Multiple Airlines
Mon 20/419:20
SOU
-
LHR
1 stop13h 50m
Multiple Airlines
Deal found 14/3£155
Tue 28/406:15
LHR
-
SOU
1 stop6h 35m
Multiple Airlines
Tue 5/513:25
SOU
-
LHR
1 stop7h 25m
Multiple Airlines
Deal found 14/3£238
Mon 19/1020:55
LHR
-
SOU
1 stop11h 40m
KLM
Fri 23/1009:05
SOU
-
LHR
1 stop10h 20m
KLM
Deal found 15/3£246
Fri 20/1120:25
LHR
-
SOU
1 stop12h 25m
KLM
Fri 27/1117:30
SOU
-
LHR
1 stop3h 20m
KLM
Deal found 17/3£247
Thu 23/414:20
LHR
-
SOU
1 stop5h 10m
Aer Lingus
Mon 27/420:00
SOU
-
LHR
1 stop12h 05m
Aer Lingus
Deal found 14/3£258
Thu 30/710:40
LHR
-
SOU
1 stop8h 20m
Multiple Airlines
Fri 31/708:55
SOU
-
LHR
1 stop11h 55m
Multiple Airlines
Deal found 16/3£270
Thu 26/307:45
LHR
-
SOU
1 stop4h 05m
Multiple Airlines
Mon 30/308:55
SOU
-
LHR
1 stop10h 55m
Multiple Airlines
Deal found 16/3£277
Mon 10/820:55
LHR
-
SOU
1 stop11h 50m
KLM
Fri 14/818:05
SOU
-
LHR
1 stop13h 35m
KLM
Deal found 16/3£285
Thu 16/421:50
LHR
-
SOU
1 stop11h 35m
British Airways
Mon 20/418:20
SOU
-
LHR
1 stop15h 30m
British Airways
Deal found 14/3£297

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 19 March 2026.

Round-trip from

£149

One-way from

£93
23/4-27/4
  • 23/4-27/4
  • 2 total stops
  • 25h 45m total
  • London to Portsmouth
Search Deals
17/4
  • 17/4
  • 1 total stop
  • 26h 05m 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 19 March 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Portsmouth that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight
Fastest return journey

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Tue 28/4

06:15-12:50

1 stop6h 35m

Southampton Eastleigh

Tue 5/5

13:25-20:50

1 stop7h 25m

£238

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Mon 10/8

20:55-08:45

1 stop11h 50m

Southampton Eastleigh

Fri 14/8

18:05-07:40

1 stop13h 35m

£285

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Thu 23/4

06:20-16:50

1 stop10h 30m

Southampton Eastleigh

Thu 30/4

09:20-15:15

1 stop5h 55m

£287

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Thu 16/4

21:50-09:25

1 stop11h 35m

Southampton Eastleigh

Mon 20/4

18:20-09:50

1 stop15h 30m

£297

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Mon 30/3

20:55-08:35

1 stop11h 40m

Southampton Eastleigh

Fri 3/4

17:20-20:55

1 stop3h 35m

£299

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Tue 21/4

06:45-20:45

1 stop14h 00m

Southampton Eastleigh

Wed 22/4

06:50-20:50

1 stop14h 00m

£302

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sat 2/5

15:10-19:30

1 stop4h 20m

Southampton Eastleigh

Sat 9/5

20:00-08:05

1 stop12h 05m

£306

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Mon 1/6

06:45-20:45

1 stop14h 00m

Southampton Eastleigh

Thu 11/6

12:35-21:00

1 stop8h 25m

£314

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Thu 28/5

20:50-09:25

1 stop12h 35m

Southampton Eastleigh

Sun 31/5

08:55-21:25

1 stop12h 30m

£335
Cheapest one-way

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 17/4

06:15-08:20

1 stop26h 05m

£93

Flights are sorted by cheapest return flights first.

Deals found on 18/3

Showing 1-10 of 13 resultsSorted by cheapest first
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 19 March 2026.

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 35m. KLM provides one of the quickest options available for as low as £297. 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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Southend to Newcastle upon Tyne flights
Stansted to Birmingham flights
Heathrow to Leeds flights
London City to Leeds flights
Gatwick to Leeds flights
London City to Exeter flights
Southend to Newquay flights
Heathrow to Southampton flights
Luton to Leeds flights
Gatwick to Exeter flights
Stansted to Leeds flights
Stansted to Exeter flights
Gatwick to Southampton flights

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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