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Cheap flights from London to Portsmouth from £42

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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — LHR
10 May — 17 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to Portsmouth

Enter your travel dates to find the best prices.

Cheapest flights from London to Portsmouth
Explore the most affordable flight options available from London to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 10 April 2026.

Fri 24/421:40
STN
-
SOU
1 stop14h 05m
Multiple Airlines
Mon 27/419:20
SOU
-
STN
1 stop15h 15m
Multiple Airlines
Deal found 7/4£114
Sat 18/416:55
LTN
-
SOU
1 stop15h 00m
Multiple Airlines
Sun 17/519:30
SOU
-
LTN
1 stop12h 40m
Multiple Airlines
Deal found 10/4£118
Wed 6/513:30
LTN
-
SOU
2 stops19h 05m
Multiple Airlines
Wed 13/508:55
SOU
-
LTN
1 stop12h 25m
Multiple Airlines
Deal found 8/4£120
Thu 7/517:30
LTN
-
SOU
1 stop15h 15m
Multiple Airlines
Thu 14/508:55
SOU
-
LTN
1 stop13h 15m
Multiple Airlines
Deal found 9/4£122
Tue 21/407:10
STN
-
SOU
1 stop5h 40m
Multiple Airlines
Sat 25/412:15
SOU
-
STN
1 stop9h 20m
Multiple Airlines
Deal found 6/4£122
Wed 22/419:20
LTN
-
SOU
1 stop13h 15m
Multiple Airlines
Sun 26/419:30
SOU
-
LTN
1 stop12h 40m
Multiple Airlines
Deal found 6/4£123
Fri 24/420:25
LTN
-
SOU
1 stop12h 15m
Multiple Airlines
Mon 27/419:20
SOU
-
LTN
1 stop15h 40m
Multiple Airlines
Deal found 7/4£124
Fri 24/406:35
LGW
-
SOU
1 stop12h 25m
Multiple Airlines
Mon 27/419:20
SOU
-
LGW
1 stop14h 10m
Multiple Airlines
Deal found 7/4£124
Tue 5/506:15
LTN
-
SOU
1 stop12h 45m
Multiple Airlines
Tue 12/519:30
SOU
-
LTN
1 stop12h 40m
Multiple Airlines
Deal found 7/4£126
Sat 18/418:30
STN
-
SOU
1 stop13h 25m
Multiple Airlines
Sun 17/520:45
SOU
-
STN
1 stop10h 50m
Multiple Airlines
Deal found 10/4£127
Sun 3/518:20
LTN
-
SOU
1 stop14h 05m
Multiple Airlines
Sun 10/508:55
SOU
-
LTN
1 stop14h 25m
Multiple Airlines
Deal found 5/4£128
Tue 5/507:40
LGW
-
SOU
1 stop9h 35m
Multiple Airlines
Tue 12/508:55
SOU
-
LGW
1 stop13h 30m
Multiple Airlines
Deal found 7/4£128

Find flight deals from London to Portsmouth

Keep the following information in mind while searching for London to Portsmouth flight deals. Data was last updated 10 April 2026.

Round-trip from

£114

One-way from

£42
24/4-27/4
  • 24/4-27/4
  • 2 total stops
  • 29h 20m total
  • London to Portsmouth
Search Deals
9/5
  • 9/5
  • 1 total stop
  • 15h 25m total
  • London to Portsmouth
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from London 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 10 April 2026.
Use the filters below to find and compare flights from London to Portsmouth that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSouthampton

STN - SOU

STNSOU

London Stansted

Fri 24/4

21:40-11:45

1 stop14h 05m

Southampton Eastleigh

Mon 27/4

19:20-10:35

1 stop15h 15m

£114

LondonSouthampton

LTN - SOU

LTNSOU

London Luton

Thu 7/5

17:30-08:45

1 stop15h 15m

Southampton Eastleigh

Thu 14/5

08:55-22:10

1 stop13h 15m

£122

LondonSouthampton

STN - SOU

STNSOU

London Stansted

Tue 21/4

07:10-12:50

1 stop5h 40m

Southampton Eastleigh

Sat 25/4

12:15-21:35

1 stop9h 20m

£122

LondonSouthampton

LTN - SOU

LTNSOU

London Luton

Sun 3/5

18:20-08:25

1 stop14h 05m

Southampton Eastleigh

Sun 10/5

19:30-08:10

1 stop12h 40m

£123

LondonSouthampton

LTN - SOU

LTNSOU

London Luton

Wed 22/4

19:20-08:35

1 stop13h 15m

Southampton Eastleigh

Sun 26/4

19:30-08:10

1 stop12h 40m

£123

LondonSouthampton

LTN - SOU

LTNSOU

London Luton

Fri 24/4

20:25-08:40

1 stop12h 15m

Southampton Eastleigh

Mon 27/4

19:20-11:00

1 stop15h 40m

£124

LondonSouthampton

LGW - SOU

LGWSOU

London Gatwick

Fri 24/4

06:35-19:00

1 stop12h 25m

Southampton Eastleigh

Mon 27/4

19:20-09:30

1 stop14h 10m

£124

LondonSouthampton

STN - SOU

STNSOU

London Stansted

Thu 7/5

17:00-07:25

1 stop14h 25m

Southampton Eastleigh

Thu 14/5

09:20-23:20

1 stop14h 00m

£127

LondonSouthampton

LTN - SOU

LTNSOU

London Luton

Fri 8/5

22:15-12:05

1 stop13h 50m

Southampton Eastleigh

Fri 15/5

08:55-21:25

1 stop12h 30m

£131

LondonSouthampton

STN - SOU

STNSOU

London Stansted

Fri 22/5

08:05-07:20

1 stop23h 15m

Southampton Eastleigh

Fri 29/5

08:00-22:45

1 stop14h 45m

£132

Flights are sorted by cheapest return flights first.

Deals found on 6/4

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from London to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from London 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 to Portsmouth

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

Find hourly flight availability from London 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 10 April 2026.

One of the essential ways to save on airfare from London to Portsmouth is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight in the evening could potentially save you up to 80% on airfare.

Related info for your journey

Find useful and relevant information for your journey from London 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 to Portsmouth?

    There are many flights that can get you from London to Portsmouth in 4h 20m. Fly via easyJet or Aer Lingus to get the fastest option. The distance from London to Portsmouth is about 53 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What are the most popular routes from London to Portsmouth?

    While some choose either London City - Southampton Eastleigh or London Heathrow - Southampton Eastleigh, London Gatwick - Southampton Eastleigh is the most popular route from London to Portsmouth.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from London 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 London to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
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Manchester to Newquay flights
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Stansted to Newcastle upon Tyne flights
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Southampton to Manchester flights
London City to Newcastle upon Tyne flights
Manchester to Southend flights
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Exeter to Edinburgh flights
Newcastle upon Tyne to Luton flights
Newcastle upon Tyne to Gatwick flights
Newcastle upon Tyne to Stansted flights
Southampton to Newcastle upon Tyne flights
Manchester to Southampton flights
Stansted to Newquay flights
Manchester to Edinburgh flights
Edinburgh to Bristol flights
Gatwick to Newquay flights
Heathrow to Liverpool flights
Gatwick to Birmingham flights
Birmingham to Heathrow flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from London to Portsmouth?

Cheapflights makes it easy to find London to Portsmouth flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Portsmouth from London.

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

Certainly. Search results for flights to Portsmouth from London shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from London 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 London today and book when prices fit your budget.

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