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Cheap flights from Portsmouth to London Heathrow Airport from £82

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 14/9. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
30 Jun — 7 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Heathrow

Enter your travel dates to find the best prices.

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 31 May 2026.

Tue 7/714:15
SOU
-
LHR
1 stop5h 50m
Multiple Airlines
Wed 29/715:10
LHR
-
SOU
1 stop4h 20m
Multiple Airlines
Deal found 31/5£241
Wed 24/620:00
SOU
-
LHR
1 stop13h 05m
Aer Lingus
Wed 1/715:10
LHR
-
SOU
1 stop4h 20m
Aer Lingus
Deal found 26/5£270
Thu 25/609:05
SOU
-
LHR
1 stop4h 45m
KLM
Thu 2/719:15
LHR
-
SOU
1 stop13h 20m
KLM
Deal found 28/5£270
Wed 24/617:20
SOU
-
LHR
1 stop17h 25m
KLM
Wed 1/714:45
LHR
-
SOU
1 stop17h 50m
KLM
Deal found 27/5£276
Thu 16/709:15
SOU
-
LHR
1 stop4h 35m
KLM
Wed 22/719:15
LHR
-
SOU
1 stop13h 30m
KLM
Deal found 31/5£288
Tue 9/620:00
SOU
-
LHR
1 stop12h 05m
Aer Lingus
Wed 10/615:10
LHR
-
SOU
1 stop4h 20m
Aer Lingus
Deal found 27/5£293
Wed 15/720:00
SOU
-
LHR
1 stop12h 05m
Aer Lingus
Sat 25/719:40
LHR
-
SOU
1 stop12h 55m
Aer Lingus
Deal found 30/5£295
Wed 1/709:05
SOU
-
LHR
1 stop4h 45m
KLM
Wed 8/708:40
LHR
-
SOU
1 stop8h 55m
KLM
Deal found 28/5£298
Sat 27/609:15
SOU
-
LHR
1 stop7h 00m
KLM
Sat 4/708:40
LHR
-
SOU
1 stop8h 20m
KLM
Deal found 30/5£300
Wed 1/709:20
SOU
-
LHR
1 stop11h 00m
Aer Lingus
Wed 8/714:20
LHR
-
SOU
1 stop5h 10m
Aer Lingus
Deal found 29/5£306

Find flight deals from Portsmouth to Heathrow

Keep the following information in mind while searching for Portsmouth to Heathrow flight deals. Data was last updated 31 May 2026.

Round-trip from

£241

One-way from

£82
Aer Lingus
  • Aer Lingus
  • 7/7-29/7
  • 2 total stops
  • 10h 10m total
  • Portsmouth to London
Search Deals
14/9
  • 14/9
  • 1 total stop
  • 13h 50m total
  • Portsmouth to London
Search Deals

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 31 May 2026.
Use the filters below to find and compare flights from Portsmouth to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Thu 25/6

09:05-13:50

1 stop4h 45m

London Heathrow

Thu 2/7

19:15-08:35

1 stop13h 20m

£270

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 1/7

09:05-13:50

1 stop4h 45m

London Heathrow

Wed 8/7

08:40-17:35

1 stop8h 55m

£298
Fastest return journey

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 1/7

09:20-15:00

1 stop5h 40m

London Heathrow

Wed 8/7

15:10-19:30

1 stop4h 20m

£300

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 27/6

09:15-16:15

1 stop7h 00m

London Heathrow

Sat 4/7

08:40-17:00

1 stop8h 20m

£300

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sun 28/6

09:15-20:55

1 stop11h 40m

London Heathrow

Sun 5/7

20:55-08:45

1 stop11h 50m

£313

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 24/6

09:20-16:00

1 stop6h 40m

London Heathrow

Wed 1/7

15:10-19:30

1 stop4h 20m

£315

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 28/9

06:45-21:15

1 stop14h 30m

London Heathrow

Wed 30/9

06:55-12:55

1 stop6h 00m

£326
Cheapest one-way

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 14/9

19:20-09:10

1 stop13h 50m

£82
Fastest single journey

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 7/8

20:10-09:10

1 stop13h 00m

£130

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 15/8

20:00-09:05

1 stop13h 05m

£134

Flights are sorted by cheapest return flights first.

Deals found on 29/5

Showing 1-10 of 12 resultsSorted by cheapest first
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 31 May 2026.

When flying from Portsmouth to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 31% versus a flight at midday.

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 23 March 2026.

Travellers seeking maximum savings on their Portsmouth to London Heathrow Airport flight should consider departing on Monday mornings when fares are most often at their lowest. Friday mornings 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 £270, KLM can have you in London Heathrow Airport from Portsmouth in 4h 45m. 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.

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
Hounslow
Milton Keynes
Northampton
Wembley
Luton
Gatwick
Croydon
Ilford
Slough
Hayes
Brentford
Colchester
Kingston upon Thames
Eastbourne
Ipswich
Watford
Swindon
Romford
Guildford
Borehamwood

Browse thousands of different options on Cheapflights for your next trip

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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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Fly with Cheapflights

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

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Users can book flights with no change fees policies with our dedicated filters. Book flights from Portsmouth to Heathrow flexibly with Cheapflights today.

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