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Cheap flights from Portsmouth to London Heathrow Airport from £153

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 17/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
7 Dec — 14 Dec1
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 7 November 2025.

Wed 3/1216:05SOU - LHR
1 stop5h 00mAer Lingus
Wed 10/1220:45LHR - SOU
1 stop12h 00mAer Lingus
Deal found 5/11£245
Sat 6/1209:30SOU - LHR
1 stop8h 20mAer Lingus
Sat 13/1218:45LHR - SOU
1 stop14h 00mAer Lingus
Deal found 7/11£257
Tue 18/1116:05SOU - LHR
1 stop5h 00mAer Lingus
Tue 10/220:45LHR - SOU
1 stop15h 10mAer Lingus
Deal found 6/11£267
Wed 3/1212:25SOU - LHR
1 stop8h 40mMultiple Airlines
Wed 10/1208:40LHR - SOU
2 stops6h 55mMultiple Airlines
Deal found 5/11£287
Sat 6/1209:30SOU - LHR
2 stops10h 35mMultiple Airlines
Sat 13/1219:35LHR - SOU
1 stop13h 10mMultiple Airlines
Deal found 7/11£290
Tue 23/1214:45SOU - LHR
1 stop5h 40mMultiple Airlines
Mon 29/1206:55LHR - SOU
1 stop10h 40mMultiple Airlines
Deal found 5/11£296
Thu 4/1208:50SOU - LHR
1 stop8h 10mKLM
Thu 11/1208:40LHR - SOU
1 stop8h 45mKLM
Deal found 6/11£298
Thu 4/1214:35SOU - LHR
1 stop5h 55mMultiple Airlines
Thu 11/1207:45LHR - SOU
1 stop4h 05mMultiple Airlines
Deal found 6/11£302
Tue 2/1214:35SOU - LHR
1 stop5h 50mBritish Airways
Sun 7/1206:50LHR - SOU
1 stop5h 00mBritish Airways
Deal found 6/11£323
Thu 20/1108:50SOU - LHR
1 stop5h 00mKLM
Mon 24/1108:40LHR - SOU
1 stop8h 45mKLM
Deal found 5/11£331
Sat 20/1209:30SOU - LHR
1 stop9h 05mMultiple Airlines
Sat 27/1206:55LHR - SOU
1 stop5h 10mMultiple Airlines
Deal found 5/11£336
Fri 7/1120:10SOU - LHR
1 stop11h 55mAer Lingus
Sat 15/1117:45LHR - SOU
1 stop15h 00mAer Lingus
Deal found 5/11£354

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 7 November 2025.

Round-trip from

£245

One-way from

£153
Aer Lingus
  • Aer Lingus
  • 3/12-10/12
  • 2 total stops
  • 17h 00m total
  • Portsmouth to London
Search Deals
British Airways
  • British Airways
  • 17/4
  • 1 total stop
  • 5h 20m 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 7 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

Sat 6/12

09:30-17:50

1 stop8h 20m

London Heathrow

Sat 13/12

18:45-08:45

1 stop14h 00m

£257

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Tue 18/11

16:05-21:05

1 stop5h 00m

London Heathrow

Tue 10/2

20:45-11:55

1 stop15h 10m

£267

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 2/1

17:05-20:55

1 stop3h 50m

London Heathrow

Mon 5/1

06:55-17:20

1 stop10h 25m

£279

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 3/12

12:25-21:05

1 stop8h 40m

London Heathrow

Wed 10/12

08:40-15:35

2 stops6h 55m

£287

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 6/12

09:30-20:05

2 stops10h 35m

London Heathrow

Sat 13/12

19:35-08:45

1 stop13h 10m

£290

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 30/3

06:50-17:55

1 stop11h 05m

London Heathrow

Tue 31/3

16:50-20:45

1 stop3h 55m

£293

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Tue 23/12

14:45-20:25

1 stop5h 40m

London Heathrow

Mon 29/12

06:55-17:35

1 stop10h 40m

£296

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Thu 4/12

08:50-17:00

1 stop8h 10m

London Heathrow

Thu 11/12

08:40-17:25

1 stop8h 45m

£298

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Thu 4/12

14:35-20:30

1 stop5h 55m

London Heathrow

Thu 11/12

07:45-11:50

1 stop4h 05m

£302

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 17/4

12:35-17:55

1 stop5h 20m

£153

Flights are sorted by cheapest return flights first.

Deals found on 6/11

Showing 1-10 of 11 results
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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 7 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 49% 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 2 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. Saturday afternoons 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 £279, Aer Lingus can have you in London Heathrow Airport from Portsmouth in 3h 50m. 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
Slough
Gatwick
Hounslow
Northampton
Luton
Ilford
Wembley
Deal
Hayes
Colchester
Watford
Winchester
Swindon
Crawley
Brentford
Romford
Chichester
Ipswich

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

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