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Cheap flights from Portsmouth to London Heathrow Airport from £76

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 20/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
29 Mar — 5 Apr1
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 27 February 2026.

Fri 27/317:35
SOU
-
LHR
1 stop3h 15m
KLM
Fri 3/420:55
LHR
-
SOU
1 stop11h 50m
KLM
Deal found 27/2£248
Sat 11/409:10
SOU
-
LHR
1 stop6h 50m
Aer Lingus
Sat 18/421:10
LHR
-
SOU
1 stop11h 25m
Aer Lingus
Deal found 25/2£278
Tue 24/308:50
SOU
-
LHR
1 stop7h 15m
KLM
Tue 31/319:15
LHR
-
SOU
1 stop13h 20m
KLM
Deal found 24/2£284
Sat 21/309:25
SOU
-
LHR
1 stop11h 25m
KLM
Mon 23/320:25
LHR
-
SOU
1 stop11h 55m
KLM
Deal found 26/2£286
Fri 10/420:00
SOU
-
LHR
1 stop12h 05m
Aer Lingus
Thu 16/421:10
LHR
-
SOU
1 stop11h 30m
Aer Lingus
Deal found 25/2£287
Thu 9/706:50
SOU
-
LHR
1 stop14h 10m
Multiple Airlines
Mon 13/706:45
LHR
-
SOU
1 stop14h 00m
Multiple Airlines
Deal found 26/2£289
Mon 13/409:10
SOU
-
LHR
1 stop4h 45m
Aer Lingus
Mon 20/409:50
LHR
-
SOU
1 stop7h 00m
Aer Lingus
Deal found 27/2£289
Wed 25/308:50
SOU
-
LHR
1 stop10h 25m
KLM
Wed 1/419:15
LHR
-
SOU
1 stop13h 20m
KLM
Deal found 25/2£300
Sat 14/317:15
SOU
-
LHR
1 stop14h 45m
Multiple Airlines
Sat 21/306:55
LHR
-
SOU
1 stop9h 50m
Multiple Airlines
Deal found 25/2£302
Wed 25/308:25
SOU
-
LHR
1 stop3h 20m
Multiple Airlines
Wed 1/406:55
LHR
-
SOU
1 stop6h 00m
Multiple Airlines
Deal found 25/2£303
Wed 4/316:05
SOU
-
LHR
1 stop5h 00m
Aer Lingus
Sun 8/320:45
LHR
-
SOU
1 stop12h 00m
Aer Lingus
Deal found 24/2£313
Fri 6/320:10
SOU
-
LHR
1 stop11h 55m
Aer Lingus
Sun 8/319:45
LHR
-
SOU
1 stop13h 00m
Aer Lingus
Deal found 27/2£315

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 27 February 2026.

Round-trip from

£248

One-way from

£76
KLM
  • KLM
  • 27/3-3/4
  • 2 total stops
  • 15h 05m total
  • Portsmouth to London
Search Deals
20/4
  • 20/4
  • 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 27 February 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

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 27/3

17:35-20:50

1 stop3h 15m

London Heathrow

Fri 3/4

20:55-08:45

1 stop11h 50m

£248

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 27/3

16:05-21:05

1 stop5h 00m

London Heathrow

Fri 3/4

21:10-08:40

1 stop11h 30m

£284

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 21/3

09:25-20:50

1 stop11h 25m

London Heathrow

Mon 23/3

20:25-08:20

1 stop11h 55m

£286

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 10/4

20:00-08:05

1 stop12h 05m

London Heathrow

Thu 16/4

21:10-08:40

1 stop11h 30m

£287

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Thu 9/7

06:50-21:00

1 stop14h 10m

London Heathrow

Mon 13/7

06:45-20:45

1 stop14h 00m

£289

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 25/3

08:25-11:45

1 stop3h 20m

London Heathrow

Wed 1/4

06:55-12:55

1 stop6h 00m

£303

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 11/3

20:50-11:00

1 stop14h 10m

London Heathrow

Thu 12/3

20:30-09:45

1 stop13h 15m

£444

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 11/4

10:15-19:25

2 stops9h 10m

London Heathrow

Sat 18/4

15:10-19:30

1 stop4h 20m

£568

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 21/3

10:15-21:05

2 stops10h 50m

London Heathrow

Mon 23/3

14:15-19:40

1 stop5h 25m

£622

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 30/3

19:20-09:10

1 stop13h 50m

£105

Flights are sorted by cheapest return flights first.

Deals found on 24/2

Showing 1-10 of 15 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 27 February 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 evening, which can drop the price by up to 67% versus a flight in the morning.

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 21 February 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 £248, KLM can have you in London Heathrow Airport from Portsmouth in 3h 15m. 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
Croydon
Wembley
Luton
Northampton
Gatwick
Slough
Hounslow
Ilford
Hayes
Brentford
Colchester
Watford
Guildford
Kingston upon Thames
Eastbourne
Ipswich
Chelmsford
Swindon
Bedford

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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