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Cheap flights from London Heathrow Airport to Portsmouth from £90

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 15/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
16 Jul — 23 Jul1
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 11 July 2025.

Round-trip from

£194

One-way from

£90
5/9-9/9
  • 5/9-9/9
  • 2 total stops
  • 20h 20m total
  • London to Portsmouth
15/12
  • 15/12
  • 1 total stop
  • 9h 25m total
  • London to Portsmouth

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 11 July 2025.

Fri 5/920:55LHR - SOU
1 stop11h 00mMultiple Airlines
Tue 9/912:25SOU - LHR
1 stop9h 20mMultiple Airlines
Deal found 9/7£194
Thu 7/820:55LHR - SOU
1 stop11h 50mKLM
Wed 13/809:20SOU - LHR
1 stop6h 55mKLM
Deal found 9/7£227
Wed 20/821:10LHR - SOU
1 stop11h 30mAer Lingus
Wed 27/809:10SOU - LHR
1 stop5h 45mAer Lingus
Deal found 9/7£269
Fri 10/1007:25LHR - SOU
1 stop4h 35mBritish Airways
Thu 16/1016:35SOU - LHR
1 stop4h 10mBritish Airways
Deal found 11/7£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 11 July 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 5/9

20:55-07:55

1 stop11h 00m

Southampton Eastleigh

Tue 9/9

12:25-21:45

1 stop9h 20m

£194

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Thu 7/8

20:55-08:45

1 stop11h 50m

Southampton Eastleigh

Wed 13/8

09:20-16:15

1 stop6h 55m

£227

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Wed 20/8

21:10-08:40

1 stop11h 30m

Southampton Eastleigh

Wed 27/8

09:10-14:55

1 stop5h 45m

£269

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 10/10

07:25-12:00

1 stop4h 35m

Southampton Eastleigh

Thu 16/10

16:35-20:45

1 stop4h 10m

£333

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Mon 15/12

09:55-19:20

1 stop9h 25m

£90

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Fri 5/9

14:20-19:30

1 stop5h 10m

£227

Flights are sorted by cheapest return flights first.

Deals found on 9/7

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 11 July 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.

Reviews of airlines servicing Portsmouth

Get insights into the airlines that provide service to Portsmouth. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portsmouth. Reviews last updated 11 July 2025.
Read through reviews of airlines operating flights from London Heathrow Airport to Portsmouth, such as KLM, Aer Lingus, andBritish Airways. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Crew

8.4

Food

7.3

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Crew

8.4

Food

7.3

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Crew

8.4

Food

7.3

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Crew

8.4

Food

7.3

Comfort

7.7

Boarding

7.8

Entertainment

7.1

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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.
  • 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

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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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