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Cheap flights from Portsmouth to London Heathrow Airport from £110

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 25/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
10 Mar — 17 Mar1
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 8 February 2026.

Mon 23/319:55
SOU
-
LHR
1 stop13h 15m
Multiple Airlines
Thu 26/320:50
LHR
-
SOU
1 stop22h 30m
Multiple Airlines
Deal found 6/2£220
Tue 24/312:25
SOU
-
LHR
1 stop7h 25m
Aer Lingus
Tue 31/315:10
LHR
-
SOU
1 stop4h 20m
Aer Lingus
Deal found 7/2£226
Wed 25/216:05
SOU
-
LHR
1 stop16h 00m
Aer Lingus
Sat 28/220:45
LHR
-
SOU
1 stop12h 00m
Aer Lingus
Deal found 7/2£252
Fri 6/317:35
SOU
-
LHR
1 stop20h 50m
KLM
Fri 13/317:50
LHR
-
SOU
1 stop15h 00m
KLM
Deal found 5/2£256
Thu 5/316:05
SOU
-
LHR
1 stop5h 00m
Aer Lingus
Thu 12/307:50
LHR
-
SOU
1 stop7h 45m
Aer Lingus
Deal found 5/2£266
Sat 7/317:30
SOU
-
LHR
1 stop17h 15m
KLM
Sat 14/317:50
LHR
-
SOU
1 stop15h 00m
KLM
Deal found 7/2£268
Sat 21/213:55
SOU
-
LHR
2 stops18h 10m
Multiple Airlines
Wed 25/207:50
LHR
-
SOU
1 stop7h 45m
Multiple Airlines
Deal found 6/2£270
Wed 25/209:25
SOU
-
LHR
2 stops7h 25m
Multiple Airlines
Sat 28/220:45
LHR
-
SOU
1 stop12h 00m
Multiple Airlines
Deal found 7/2£278
Sun 8/309:30
SOU
-
LHR
1 stop22h 10m
KLM
Sun 15/311:45
LHR
-
SOU
1 stop20h 35m
KLM
Deal found 8/2£281
Tue 10/308:25
SOU
-
LHR
1 stop9h 40m
Multiple Airlines
Tue 17/308:40
LHR
-
SOU
1 stop10h 40m
Multiple Airlines
Deal found 8/2£287
Sun 8/312:15
SOU
-
LHR
1 stop6h 10m
British Airways
Sun 15/307:45
LHR
-
SOU
1 stop4h 05m
British Airways
Deal found 8/2£305

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 8 February 2026.

Round-trip from

£220

One-way from

£110
23/3-26/3
  • 23/3-26/3
  • 2 total stops
  • 35h 45m total
  • Portsmouth to London
Search Deals
Aer Lingus
  • Aer Lingus
  • 25/3
  • 1 total stop
  • 8h 40m 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 8 February 2026.
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

Tue 24/3

12:25-19:50

1 stop7h 25m

London Heathrow

Tue 31/3

15:10-19:30

1 stop4h 20m

£226

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 25/2

16:05-08:05

1 stop16h 00m

London Heathrow

Sat 28/2

20:45-08:45

1 stop12h 00m

£252

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 6/3

17:35-14:25

1 stop20h 50m

London Heathrow

Fri 13/3

17:50-08:50

1 stop15h 00m

£256

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Thu 5/3

16:05-21:05

1 stop5h 00m

London Heathrow

Thu 12/3

07:50-15:35

1 stop7h 45m

£266

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 7/3

17:30-10:45

1 stop17h 15m

London Heathrow

Sat 14/3

17:50-08:50

1 stop15h 00m

£268

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 21/2

13:55-08:05

2 stops18h 10m

London Heathrow

Wed 25/2

07:50-15:35

1 stop7h 45m

£270

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 25/2

09:25-16:50

2 stops7h 25m

London Heathrow

Sat 28/2

20:45-08:45

1 stop12h 00m

£278

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 23/3

19:55-09:10

1 stop13h 15m

London Heathrow

Thu 26/3

08:50-17:30

2 stops8h 40m

£286

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Tue 10/3

08:25-18:05

1 stop9h 40m

London Heathrow

Tue 17/3

08:40-19:20

1 stop10h 40m

£287

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sun 8/3

12:15-18:25

1 stop6h 10m

London Heathrow

Sun 15/3

07:45-11:50

1 stop4h 05m

£305

Flights are sorted by cheapest return flights first.

Deals found on 7/2

Showing 1-10 of 16 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 8 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 69% 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 31 January 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 £226, Aer Lingus can have you in London Heathrow Airport from Portsmouth in 7h 25m. 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
Luton
Northampton
Wembley
Gatwick
Slough
Ilford
Hounslow
Brentford
Hayes
Colchester
Watford
Guildford
Swindon
Bedford
Chelmsford
Eastbourne
Crawley
Kingston upon Thames

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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