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Cheap flights from Portsmouth to London Heathrow Airport from £151

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 20/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
29 Dec — 5 Jan1
1 adult
1 adult, Economy, 0 bags

Find 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 29 November 2025.

Sun 14/1215:25SOU - LHR
1 stop6h 00mMultiple Airlines
Thu 18/1207:00LHR - SOU
1 stop6h 35mMultiple Airlines
Deal found 29/11£265
Fri 26/1216:05SOU - LHR
1 stop5h 00mAer Lingus
Fri 2/120:45LHR - SOU
1 stop12h 00mAer Lingus
Deal found 28/11£308
Tue 16/1208:45SOU - LHR
1 stop9h 20mMultiple Airlines
Wed 17/1208:40LHR - SOU
1 stop10h 40mMultiple Airlines
Deal found 27/11£353
Sun 30/1118:25SOU - LHR
1 stop15h 45mMultiple Airlines
Sun 7/1206:50LHR - SOU
1 stop13h 05mMultiple Airlines
Deal found 29/11£394
Fri 26/1216:05SOU - LHR
1 stop5h 00mMultiple Airlines
Fri 2/110:55LHR - SOU
2 stops8h 25mMultiple Airlines
Deal found 28/11£410
Sat 27/1217:30SOU - LHR
1 stop22h 35mKLM
Sat 3/108:40LHR - SOU
1 stop8h 20mKLM
Deal found 29/11£457
Sat 27/1209:45SOU - LHR
2 stops10h 05mMultiple Airlines
Sat 3/120:45LHR - SOU
1 stop12h 00mMultiple Airlines
Deal found 29/11£1,063

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 29 November 2025.

Round-trip from

£239

One-way from

£151
12/1-3/2
  • 12/1-3/2
  • 2 total stops
  • 10h 50m total
  • Portsmouth to London
Search Deals
British Airways
  • British Airways
  • 20/3
  • 1 total stop
  • 4h 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 29 November 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

Mon 12/1

16:05-21:05

1 stop5h 00m

London Heathrow

Tue 3/2

09:00-14:50

1 stop5h 50m

£239

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 17/1

09:30-15:35

1 stop6h 05m

London Heathrow

Mon 19/1

20:45-11:55

1 stop15h 10m

£258

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 17/1

09:30-15:35

1 stop6h 05m

London Heathrow

Mon 19/1

20:50-11:55

2 stops39h 05m

£262

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sun 14/12

15:25-21:25

1 stop6h 00m

London Heathrow

Thu 18/12

07:00-13:35

1 stop6h 35m

£265

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 9/1

09:30-15:35

1 stop6h 05m

London Heathrow

Fri 9/1

19:45-08:45

1 stop13h 00m

£273

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 2/3

12:00-17:30

1 stop5h 30m

London Heathrow

Thu 5/3

09:50-17:30

1 stop7h 40m

£281

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 26/12

16:05-21:05

1 stop5h 00m

London Heathrow

Fri 2/1

20:45-08:45

1 stop12h 00m

£308

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sun 29/3

08:55-14:30

1 stop5h 35m

London Heathrow

Sun 29/3

21:40-09:25

1 stop11h 45m

£351

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 9/1

09:30-15:35

1 stop6h 05m

London Heathrow

Fri 9/1

22:15-17:45

3 stops43h 30m

£376

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 20/3

12:00-16:15

1 stop4h 15m

£151

Flights are sorted by cheapest return flights first.

Deals found on 28/11

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 29 November 2025.

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 50% 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 25 November 2025.

Travellers seeking maximum savings on their Portsmouth to London Heathrow Airport flight should consider departing on Tuesday mornings when fares are most often at their lowest. Thursday at midday 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 £258, Aer Lingus can have you in London Heathrow Airport from Portsmouth in 6h 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.

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
Slough
Croydon
Hounslow
Northampton
Gatwick
Luton
Ilford
Wembley
Deal
Hayes
Colchester
Watford
Brentford
Winchester
Swindon
Crawley
Romford
Chichester
Bedford

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

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