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Cheap flights from London Heathrow Airport to Portsmouth from £81

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 20/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
18 Oct — 25 Oct1
1 adult
1 adult, Economy

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 18 September 2025.

Round-trip from

£211

One-way from

£81
Aer Lingus
  • Aer Lingus
  • 2/10-8/10
  • 2 total stops
  • 24h 35m total
  • London to Portsmouth
Search Deals
Aer Lingus
  • Aer Lingus
  • 20/10
  • 1 total stop
  • 12h 05m 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 18 September 2025.

Fri 26/915:05LHR - SOU
1 stop3h 50mMultiple Airlines
Mon 29/908:05SOU - LHR
1 stop6h 10mMultiple Airlines
Deal found 17/9£178
Thu 2/1021:10LHR - SOU
1 stop11h 30mAer Lingus
Wed 8/1020:00SOU - LHR
1 stop13h 05mAer Lingus
Deal found 16/9£211
Fri 31/1019:45LHR - SOU
1 stop13h 00mAer Lingus
Fri 7/1116:05SOU - LHR
1 stop5h 00mAer Lingus
Deal found 16/9£238
Sat 4/1020:10LHR - SOU
1 stop12h 25mAer Lingus
Sat 11/1009:40SOU - LHR
1 stop10h 40mAer Lingus
Deal found 16/9£240
Thu 2/1014:20LHR - SOU
1 stop5h 10mMultiple Airlines
Mon 6/1008:05SOU - LHR
1 stop6h 10mMultiple Airlines
Deal found 17/9£248
Wed 1/1021:10LHR - SOU
1 stop11h 30mMultiple Airlines
Fri 3/1019:25SOU - LHR
1 stop18h 50mMultiple Airlines
Deal found 17/9£279
Sun 21/915:05LHR - SOU
1 stop16h 30mMultiple Airlines
Wed 24/909:10SOU - LHR
1 stop5h 45mMultiple Airlines
Deal found 16/9£295
Wed 1/1015:10LHR - SOU
1 stop4h 20mMultiple Airlines
Sat 4/1008:25SOU - LHR
2 stops11h 55mMultiple Airlines
Deal found 17/9£304
Mon 22/921:10LHR - SOU
1 stop11h 05mAer Lingus
Tue 23/920:00SOU - LHR
1 stop17h 55mAer Lingus
Deal found 16/9£306
Sat 1/1119:35LHR - SOU
1 stop13h 10mAer Lingus
Sat 8/1109:30SOU - LHR
1 stop6h 05mAer Lingus
Deal found 17/9£308
Wed 1/1015:50LHR - SOU
1 stop16h 50mAer Lingus
Sat 4/1009:40SOU - LHR
1 stop10h 40mAer Lingus
Deal found 17/9£311
Sun 21/915:05LHR - SOU
1 stop16h 30mMultiple Airlines
Sat 4/1009:40SOU - LHR
1 stop10h 40mMultiple Airlines
Deal found 17/9£312

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 18 September 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

Thu 2/10

21:10-08:40

1 stop11h 30m

Southampton Eastleigh

Wed 8/10

20:00-09:05

1 stop13h 05m

£211

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 31/10

19:45-08:45

1 stop13h 00m

Southampton Eastleigh

Fri 7/11

16:05-21:05

1 stop5h 00m

£238

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sat 4/10

20:10-08:35

1 stop12h 25m

Southampton Eastleigh

Sat 11/10

09:40-20:20

1 stop10h 40m

£240

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Thu 2/10

14:20-19:30

1 stop5h 10m

Southampton Eastleigh

Mon 6/10

08:05-14:15

1 stop6h 10m

£248

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Wed 1/10

21:10-08:40

1 stop11h 30m

Southampton Eastleigh

Fri 3/10

19:25-14:15

1 stop18h 50m

£279

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Wed 1/10

15:10-19:30

1 stop4h 20m

Southampton Eastleigh

Sat 4/10

08:25-20:20

2 stops11h 55m

£304

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sat 1/11

19:35-08:45

1 stop13h 10m

Southampton Eastleigh

Sat 8/11

09:30-15:35

1 stop6h 05m

£308

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Wed 1/10

15:50-08:40

1 stop16h 50m

Southampton Eastleigh

Sat 4/10

09:40-20:20

1 stop10h 40m

£311

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Wed 11/2

07:00-11:45

1 stop4h 45m

Southampton Eastleigh

Wed 18/2

08:55-12:55

1 stop4h 00m

£322

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sat 4/10

07:40-17:30

2 stops9h 50m

Southampton Eastleigh

Sat 11/10

09:40-18:20

1 stop8h 40m

£322

Flights are sorted by cheapest return flights first.

Deals found on 16/9

Showing 1-10 of 18 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 18 September 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 30m. Aer Lingus provides one of the quickest options available for as low as £211. 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

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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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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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