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Cheap flights from Portsmouth to London Heathrow Airport from £129

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 31/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
1 Jun — 8 Jun1
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 2 May 2026.

Mon 11/519:20
SOU
-
LHR
1 stop13h 50m
Multiple Airlines
Thu 14/507:40
LHR
-
SOU
1 stop11h 50m
Multiple Airlines
Deal found 27/4£214
Wed 27/509:20
SOU
-
LHR
1 stop5h 40m
Multiple Airlines
Wed 3/608:55
LHR
-
SOU
1 stop6h 05m
Multiple Airlines
Deal found 29/4£264
Fri 11/917:20
SOU
-
LHR
1 stop3h 35m
KLM
Tue 15/911:45
LHR
-
SOU
1 stop5h 05m
KLM
Deal found 27/4£268
Tue 2/620:00
SOU
-
LHR
1 stop12h 05m
Aer Lingus
Thu 4/615:10
LHR
-
SOU
1 stop4h 20m
Aer Lingus
Deal found 30/4£271
Wed 13/509:20
SOU
-
LHR
1 stop4h 35m
Aer Lingus
Fri 15/521:10
LHR
-
SOU
1 stop19h 40m
Aer Lingus
Deal found 1/5£272
Thu 14/509:20
SOU
-
LHR
1 stop5h 40m
Aer Lingus
Sun 17/522:00
LHR
-
SOU
1 stop10h 40m
Aer Lingus
Deal found 30/4£275
Wed 27/509:20
SOU
-
LHR
1 stop5h 40m
Aer Lingus
Wed 3/612:00
LHR
-
SOU
1 stop7h 30m
Aer Lingus
Deal found 29/4£282
Thu 11/609:20
SOU
-
LHR
1 stop10h 05m
Aer Lingus
Thu 18/615:10
LHR
-
SOU
1 stop4h 20m
Aer Lingus
Deal found 27/4£296
Mon 11/509:20
SOU
-
LHR
1 stop9h 35m
Aer Lingus
Thu 14/507:40
LHR
-
SOU
1 stop11h 50m
Aer Lingus
Deal found 27/4£297

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 2 May 2026.

Round-trip from

£264

One-way from

£212
27/5-3/6
  • 27/5-3/6
  • 2 total stops
  • 11h 45m total
  • Portsmouth to London
Search Deals
British Airways
  • British Airways
  • 27/6
  • 1 total stop
  • 5h 15m 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 2 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

Wed 27/5

09:20-15:00

1 stop5h 40m

London Heathrow

Wed 3/6

08:55-15:00

1 stop6h 05m

£264
Fastest return journey

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 11/9

17:20-20:55

1 stop3h 35m

London Heathrow

Tue 15/9

11:45-16:50

1 stop5h 05m

£268

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Tue 2/6

20:00-08:05

1 stop12h 05m

London Heathrow

Thu 4/6

15:10-19:30

1 stop4h 20m

£271

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 13/5

09:20-13:55

1 stop4h 35m

London Heathrow

Fri 15/5

21:10-16:50

1 stop19h 40m

£272

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Thu 14/5

09:20-15:00

1 stop5h 40m

London Heathrow

Sun 17/5

22:00-08:40

1 stop10h 40m

£275

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 12/6

12:20-21:10

1 stop8h 50m

London Heathrow

Fri 19/6

06:45-17:45

1 stop11h 00m

£308

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 16/5

20:00-08:05

1 stop12h 05m

London Heathrow

Thu 21/5

14:20-19:30

1 stop5h 10m

£309

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Thu 23/7

09:20-13:55

1 stop4h 35m

London Heathrow

Fri 24/7

15:10-19:30

1 stop4h 20m

£325

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 5/6

06:45-11:45

1 stop5h 00m

London Heathrow

Sun 7/6

07:35-14:05

1 stop6h 30m

£366
Cheapest one-way

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sun 31/5

20:00-20:20

1 stop24h 20m

£129

Flights are sorted by cheapest return flights first.

Deals found on 2/5

Showing 1-10 of 13 resultsSorted by cheapest first
1
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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 2 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 25% 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 £268, KLM can have you in London Heathrow Airport from Portsmouth in 3h 35m. 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.

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
Wembley
Croydon
Northampton
Hounslow
Luton
Gatwick
Ilford
Slough
Hayes
Brentford
Colchester
Romford
Watford
Kingston upon Thames
Eastbourne
Swindon
Ipswich
Southend-on-Sea
Guildford

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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