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Cheap flights from Portsmouth to London Heathrow Airport from £94

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 14/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
15 Oct — 22 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Portsmouth to Heathrow

Keep the following information in mind while searching for Portsmouth to Heathrow flight deals. Data was last updated 15 September 2025.

Round-trip from

£162

One-way from

£94
Aer Lingus
  • Aer Lingus
  • 13/10-20/10
  • 2 total stops
  • 18h 15m total
  • Portsmouth to London
Search Deals
Aer Lingus
  • Aer Lingus
  • 14/10
  • 1 total stop
  • 12h 00m total
  • Portsmouth to London
Search Deals

Find flight deals from Portsmouth to Heathrow

Cheapest flights from Portsmouth to Heathrow
Explore the most affordable flight options available from Portsmouth to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 September 2025.

Mon 13/1008:05SOU - LHR
1 stop6h 10mMultiple Airlines
Mon 20/1020:10LHR - SOU
1 stop12h 05mMultiple Airlines
Deal found 15/9£162
Mon 29/908:05SOU - LHR
1 stop6h 10mMultiple Airlines
Fri 3/1015:05LHR - SOU
1 stop3h 50mMultiple Airlines
Deal found 14/9£176
Wed 29/1016:05SOU - LHR
1 stop5h 00mAer Lingus
Wed 5/1108:50LHR - SOU
1 stop6h 45mAer Lingus
Deal found 14/9£195
Thu 30/1009:30SOU - LHR
1 stop6h 05mAer Lingus
Thu 6/1115:10LHR - SOU
1 stop4h 30mAer Lingus
Deal found 15/9£214
Sat 11/1009:20SOU - LHR
1 stop11h 35mKLM
Sun 12/1020:55LHR - SOU
1 stop11h 50mKLM
Deal found 12/9£230
Thu 16/1009:40SOU - LHR
1 stop5h 15mAer Lingus
Wed 22/1014:20LHR - SOU
1 stop5h 10mAer Lingus
Deal found 15/9£251
Sun 12/1009:10SOU - LHR
1 stop4h 45mAer Lingus
Sun 19/1022:00LHR - SOU
1 stop11h 10mAer Lingus
Deal found 14/9£254
Sat 11/1008:55SOU - LHR
1 stop11h 25mMultiple Airlines
Sat 18/1019:20LHR - SOU
1 stop13h 05mMultiple Airlines
Deal found 13/9£271
Wed 29/1014:25SOU - LHR
2 stops6h 40mMultiple Airlines
Wed 5/1113:25LHR - SOU
1 stop5h 05mMultiple Airlines
Deal found 14/9£289
Mon 20/1013:10SOU - LHR
1 stop3h 35mBritish Airways
Fri 14/1106:05LHR - SOU
1 stop5h 45mBritish Airways
Deal found 13/9£316
Thu 30/1014:45SOU - LHR
2 stops7h 00mMultiple Airlines
Thu 6/1112:50LHR - SOU
1 stop5h 40mMultiple Airlines
Deal found 15/9£318

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Heathrow 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 15 September 2025.
Use the filters below to find and compare flights from Portsmouth to London Heathrow Airport that are best for you.

Fly from

Portsmouth

Fly to

Heathrow

Route

Depart

Return

Price

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 13/10

08:05-14:15

1 stop6h 10m

London Heathrow

Mon 20/10

20:10-08:15

1 stop12h 05m

£162

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 29/9

08:05-14:15

1 stop6h 10m

London Heathrow

Fri 3/10

15:05-18:55

1 stop3h 50m

£176

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 29/10

16:05-21:05

1 stop5h 00m

London Heathrow

Wed 5/11

08:50-15:35

1 stop6h 45m

£195

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 11/10

09:20-20:55

1 stop11h 35m

London Heathrow

Sun 12/10

20:55-08:45

1 stop11h 50m

£230

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Thu 16/10

09:40-14:55

1 stop5h 15m

London Heathrow

Wed 22/10

14:20-19:30

1 stop5h 10m

£251

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sun 12/10

09:10-13:55

1 stop4h 45m

London Heathrow

Sun 19/10

22:00-09:10

1 stop11h 10m

£254

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 11/10

08:55-20:20

1 stop11h 25m

London Heathrow

Sat 18/10

19:20-08:25

1 stop13h 05m

£271

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 29/10

14:25-21:05

2 stops6h 40m

London Heathrow

Wed 5/11

13:25-18:30

1 stop5h 05m

£289

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 20/10

13:10-16:45

1 stop3h 35m

London Heathrow

Fri 14/11

06:05-11:50

1 stop5h 45m

£316

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 1/11

09:40-16:20

1 stop6h 40m

London Heathrow

Sun 16/11

06:50-11:50

1 stop5h 00m

£323

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Showing 1-10 of 17 results
1
2

Best time to book a flight from Portsmouth to Heathrow

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

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

Find hourly flight availability from Portsmouth to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 15 September 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portsmouth to London Heathrow Airport as you normally would.

What is the cheapest day to fly from Portsmouth to London Heathrow Airport?

Use this chart to determine the cheapest time to fly return from Portsmouth to Heathrow. Price data was last updated on 14 September 2025.

Travellers seeking maximum savings on their Portsmouth to London Heathrow Airport flight should consider departing on Saturday evenings when fares are most often at their lowest. Saturday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

Related info for your journey

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

    For as low as £195, Aer Lingus can have you in London Heathrow Airport from Portsmouth in 5h. Airlines will cover a distance of 53 mi. This flight may include one or multiple stops.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portsmouth to Heathrow 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 Portsmouth to London Heathrow Airport?

    Currently, January is the cheapest month in which you can book a flight from Portsmouth to London Heathrow Airport (average of £112). Flying from Portsmouth to London Heathrow Airport 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

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Milton Keynes
Croydon
Hounslow
Slough
Gatwick
Northampton
Luton
Deal
Wembley
Ilford
Crawley
Hayes
Watford
Winchester
Chichester
Ipswich
Swindon
Dartford
Guildford
Brentford

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Alternative routes for Portsmouth to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
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