Find flights
When to book
FAQs

Cheap flights from Portsmouth to London Heathrow Airport from £169

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 29/12. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
14 Dec — 21 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 14 November 2025.

Wed 10/1217:30SOU - LHR
1 stop15h 30mKLM
Wed 17/1220:25LHR - SOU
1 stop11h 55mKLM
Deal found 12/11£256
Wed 10/1216:05SOU - LHR
1 stop5h 00mAer Lingus
Wed 17/1207:50LHR - SOU
1 stop7h 45mAer Lingus
Deal found 12/11£271
Tue 18/1116:05SOU - LHR
1 stop5h 00mAer Lingus
Tue 25/1114:15LHR - SOU
1 stop5h 25mAer Lingus
Deal found 13/11£286
Wed 26/1116:05SOU - LHR
1 stop5h 00mAer Lingus
Thu 27/1115:10LHR - SOU
1 stop4h 30mAer Lingus
Deal found 13/11£299
Thu 27/1114:35SOU - LHR
1 stop5h 55mMultiple Airlines
Mon 1/1209:50LHR - SOU
1 stop7h 35mMultiple Airlines
Deal found 12/11£328
Wed 10/1214:25SOU - LHR
1 stop5h 05mBritish Airways
Wed 17/1207:00LHR - SOU
1 stop6h 55mBritish Airways
Deal found 12/11£334
Wed 10/1214:25SOU - LHR
2 stops6h 40mMultiple Airlines
Wed 17/1207:00LHR - SOU
1 stop11h 30mMultiple Airlines
Deal found 12/11£337

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 14 November 2025.

Round-trip from

£195

One-way from

£169
Aer Lingus
  • Aer Lingus
  • 10/1-24/1
  • 2 total stops
  • 35h 05m total
  • Portsmouth to London
Search Deals
British Airways
  • British Airways
  • 29/12
  • 1 total stop
  • 13h 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 14 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 10/1

15:20-14:25

1 stop23h 05m

London Heathrow

Sat 24/1

20:45-08:45

1 stop12h 00m

£195

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 2/1

17:05-22:30

1 stop5h 25m

London Heathrow

Mon 5/1

06:55-17:30

1 stop10h 35m

£253

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 10/12

17:30-09:00

1 stop15h 30m

London Heathrow

Wed 17/12

20:25-08:20

1 stop11h 55m

£256

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

Thu 27/11

14:35-20:30

1 stop5h 55m

London Heathrow

Mon 1/12

09:50-17:25

1 stop7h 35m

£328

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 10/12

14:25-19:30

1 stop5h 05m

London Heathrow

Wed 17/12

07:00-13:55

1 stop6h 55m

£334

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 10/12

14:25-21:05

2 stops6h 40m

London Heathrow

Wed 17/12

07:00-18:30

1 stop11h 30m

£337

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 29/12

18:10-07:30

1 stop13h 20m

£169

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sun 28/12

20:10-09:05

1 stop12h 55m

£210

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sun 28/12

18:30-07:20

1 stop12h 50m

£223

Flights are sorted by cheapest return flights first.

Deals found on 14/11

Showing 1-10 of 11 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 14 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 £293, KLM can have you in London Heathrow Airport from Portsmouth in 11h 05m. 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portsmouth to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
Edinburgh to Luton flights
Edinburgh to Heathrow flights
Edinburgh to Stansted flights
Edinburgh to Gatwick flights
Edinburgh to London City flights
Manchester to Gatwick flights
Manchester to Heathrow flights
Manchester to Stansted flights
Manchester to Luton flights
Manchester to London City flights
Manchester to Southend flights
Heathrow to Gatwick flights
Newcastle upon Tyne to Heathrow flights
Newquay to Stansted flights
Newquay to Heathrow flights
Newcastle upon Tyne to Luton flights
Newcastle upon Tyne to Stansted flights
Newcastle upon Tyne to Gatwick flights
Newquay to Luton flights
Newquay to Gatwick flights
Gatwick to Heathrow flights
Newcastle upon Tyne to London City flights
Liverpool to London City flights
Newquay to London City flights
Edinburgh to Southend flights
Leeds to Heathrow flights
Birmingham to Gatwick flights
Birmingham to Heathrow flights
Leeds to Gatwick flights
Leeds to London City flights
Liverpool to Heathrow flights
Leeds to Luton flights
Leeds to Stansted flights
Liverpool to Gatwick flights
Birmingham to Luton flights
Liverpool to Luton flights
Liverpool to Stansted flights
Southampton to Gatwick flights
Newcastle upon Tyne to Southend flights
Bristol to Heathrow flights
Bristol to London City flights
Birmingham to London City flights
Birmingham to Stansted flights
Darlington to Heathrow flights
Southampton to Heathrow flights
Southampton to London City flights
Exeter to Heathrow flights
Exeter to London City flights
Norwich to Heathrow flights
Bristol to Gatwick flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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

Cheapflights makes it easy to find Portsmouth to Heathrow flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Heathrow?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Portsmouth to Heathrow.

Can Cheapflights find flights from Portsmouth to Heathrow with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Portsmouth to Heathrow flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Portsmouth to Heathrow become cheaper?

Of course! You can now track prices for flights from Portsmouth to Heathrow and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.