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Cheap flights from Portsmouth to London Heathrow Airport from £172

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 19/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
10 set — 17 set1
1 adult

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 5 setembro 2025.

Round-trip from

£215

One-way from

£172
19/9-21/9
  • 19/9-21/9
  • 2 total stops
  • 35h 20m total
  • Portsmouth to London
Search Deals
British Airways
  • British Airways
  • 19/10
  • 1 total stop
  • 5h 25m 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 5 setembro 2025.

sex 19/919:25SOU - LHR
1 stop18h 50mMultiple Airlines
dom 21/915:05LHR - SOU
1 stop16h 30mMultiple Airlines
Deal found 3/9£215
seg 20/1008:10SOU - LHR
1 stop6h 05mMultiple Airlines
seg 27/1007:50LHR - SOU
1 stop7h 45mMultiple Airlines
Deal found 5/9£221
ter 7/1020:00SOU - LHR
1 stop13h 05mAer Lingus
qui 9/1015:10LHR - SOU
1 stop4h 20mAer Lingus
Deal found 3/9£226
sáb 4/1009:40SOU - LHR
1 stop10h 40mAer Lingus
sáb 11/1021:10LHR - SOU
1 stop11h 25mAer Lingus
Deal found 4/9£249
sex 3/1009:40SOU - LHR
1 stop9h 45mAer Lingus
sex 10/1021:10LHR - SOU
1 stop11h 30mAer Lingus
Deal found 5/9£285
qui 18/920:00SOU - LHR
1 stop13h 05mAer Lingus
sáb 27/920:10LHR - SOU
1 stop12h 25mAer Lingus
Deal found 5/9£307
sáb 4/1009:40SOU - LHR
1 stop5h 15mMultiple Airlines
sáb 11/1015:10LHR - SOU
2 stops16h 45mMultiple Airlines
Deal found 4/9£316
ter 7/1009:10SOU - LHR
1 stop6h 45mMultiple Airlines
qui 9/1007:40LHR - SOU
2 stops9h 20mMultiple Airlines
Deal found 3/9£336
qua 1/1009:10SOU - LHR
1 stop9h 45mAer Lingus
qua 8/1013:25LHR - SOU
1 stop6h 05mAer Lingus
Deal found 3/9£360

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 5 setembro 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

sex 19/9

19:25-14:15

1 stop18h 50m

London Heathrow

dom 21/9

15:05-07:35

1 stop16h 30m

£215

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

seg 20/10

08:10-14:15

1 stop6h 05m

London Heathrow

seg 27/10

07:50-15:35

1 stop7h 45m

£221

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

ter 7/10

20:00-09:05

1 stop13h 05m

London Heathrow

qui 9/10

15:10-19:30

1 stop4h 20m

£226

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

sáb 4/10

09:40-20:20

1 stop10h 40m

London Heathrow

sáb 11/10

21:10-08:35

1 stop11h 25m

£249

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

sex 3/10

09:40-19:25

1 stop9h 45m

London Heathrow

sex 10/10

21:10-08:40

1 stop11h 30m

£285

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

qui 18/9

20:00-09:05

1 stop13h 05m

London Heathrow

sáb 27/9

20:10-08:35

1 stop12h 25m

£307

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

sáb 4/10

09:40-14:55

1 stop5h 15m

London Heathrow

sáb 11/10

15:10-07:55

2 stops16h 45m

£316

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

ter 7/10

09:10-15:55

1 stop6h 45m

London Heathrow

qui 9/10

07:40-17:00

2 stops9h 20m

£336

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

qua 1/10

09:10-18:55

1 stop9h 45m

London Heathrow

qua 8/10

13:25-19:30

1 stop6h 05m

£360

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

dom 19/10

16:00-21:25

1 stop5h 25m

£172

Flights are sorted by cheapest return flights first.

Deals found on 4/9

Showing 1-10 of 14 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 5 setembro 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 31 August 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 £226, Aer Lingus can have you in London Heathrow Airport from Portsmouth in 13h 05m. Airlines will cover a distance of 53 mi.

  • 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
Gatwick
Slough
Northampton
Luton
Deal
Wembley
Ilford
Crawley
Hayes
Ipswich
Watford
Folkestone
Chichester
Winchester
Swindon
Dartford
Eastbourne

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Alternative routes for Portsmouth to Heathrow

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