What is the cheapest month to book a flight from Portsmouth to London Heathrow Airport?

Currently, January is the cheapest month in which you can book a flight from Portsmouth to London Heathrow Airport (average of £112). Flying from Portsmouth to London Heathrow Airport in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 40.0 - 70.0 inches per month. January is typically the wettest month, when rainfall can reach 70.0 mm. July is typically the driest time to visit London Heathrow Airport when rainfall is around 40.0 mm.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 17.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).

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.

£94+ Flights from Portsmouth to London Heathrow Airport

Cheap flight deals from Portsmouth to Heathrow

Round-trip from	£261
One-way from	£94

27/8-3/9
2 total stops
13h 10m total
Portsmouth to London

Search Deals

6/10
1 total stop
9h 00m total
Portsmouth to London

Search Deals

Find flight deals from Portsmouth to Heathrow

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 15 July 2025.

Wed 27/809:10SOU - LHR

1 stop4h 45mMultiple Airlines

Wed 3/907:40LHR - SOU

1 stop8h 25mMultiple Airlines

Deal found 13/7£261

Sat 2/809:20SOU - LHR

1 stop4h 30mKLM

Mon 4/806:30LHR - SOU

1 stop11h 20mKLM

Deal found 13/7£322

Thu 28/809:40SOU - LHR

1 stop6h 15mAer Lingus

Thu 4/914:20LHR - SOU

1 stop5h 10mAer Lingus

Deal found 14/7£345

Thu 28/808:30SOU - LHR

1 stop12h 55mBritish Airways

Thu 4/907:30LHR - SOU

1 stop8h 35mBritish Airways

Deal found 14/7£380

Best flights from Portsmouth to Heathrow
Discover carefully curated flight deals from Portsmouth to Heathrow that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 15 July 2025.

Wed 27/809:10SOU - LHR

1 stop4h 45mMultiple Airlines

Wed 3/907:40LHR - SOU

1 stop8h 25mMultiple Airlines

Deal found 13/7£261

Sat 2/809:20SOU - LHR

1 stop4h 30mKLM

Mon 4/806:30LHR - SOU

1 stop11h 20mKLM

Deal found 13/7£322

Thu 28/809:40SOU - LHR

1 stop6h 15mAer Lingus

Thu 4/914:20LHR - SOU

1 stop5h 10mAer Lingus

Deal found 14/7£345

Thu 28/808:30SOU - LHR

1 stop12h 55mBritish Airways

Thu 4/907:30LHR - SOU

1 stop8h 35mBritish Airways

Deal found 14/7£380

Last-minute flights from Portsmouth to Heathrow
Discover last-minute flight deals from Portsmouth to Heathrow. Data last updated 15 July 2025 and is based on user searches.

Sun 20/720:00SOU - LHR

1 stop22h 15mMultiple Airlines

Sun 3/807:35LHR - SOU

1 stop24h 25mMultiple Airlines

Deal found 13/7£418

Sat 2/809:20SOU - LHR

1 stop4h 30mKLM

Mon 4/806:30LHR - SOU

1 stop11h 20mKLM

Deal found 13/7£322

Wed 27/809:10SOU - LHR

1 stop4h 45mMultiple Airlines

Wed 3/907:40LHR - SOU

1 stop8h 25mMultiple Airlines

Deal found 13/7£261

Thu 28/809:40SOU - LHR

1 stop6h 15mAer Lingus

Thu 4/914:20LHR - SOU

1 stop5h 10mAer Lingus

Deal found 14/7£345

Thu 28/808:30SOU - LHR

1 stop12h 55mBritish Airways

Thu 4/907:30LHR - SOU

1 stop8h 35mBritish Airways

Deal found 14/7£380

One-way flights from Portsmouth to Heathrow
Search for one-way flight options from Portsmouth to Heathrow. Find affordable one-way fares based on user searches. Data last updated 15 July 2025.

Mon 6/1011:50SOU - LHR

1 stop9h 00mMultiple Airlines

Deal found 14/7£94

Wed 31/1211:40SOU - LHR

1 stop6h 45mBritish Airways

Deal found 13/7£134

Fri 29/817:35SOU - LHR

1 stop14h 05mKLM

Deal found 15/7£207

Cheapflights Fare Finder

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

Wed 27/8

09:10-13:55

1 stop4h 45m

London Heathrow

Wed 3/9

07:40-16:05

1 stop8h 25m

£261

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Sat 2/8

09:20-13:50

1 stop4h 30m

London Heathrow

Mon 4/8

06:30-17:50

1 stop11h 20m

£322

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Thu 28/8

09:40-15:55

1 stop6h 15m

London Heathrow

Thu 4/9

14:20-19:30

1 stop5h 10m

£345

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Thu 28/8

08:30-21:25

1 stop12h 55m

London Heathrow

Thu 4/9

07:30-16:05

1 stop8h 35m

£380

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Mon 6/10

11:50-20:50

1 stop9h 00m

£94

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Wed 31/12

11:40-18:25

1 stop6h 45m

£134

SouthamptonLondon

SOU - LHR

SOULHR

Southampton Eastleigh

Fri 29/8

17:35-07:40

1 stop14h 05m

£207

Flights are sorted by cheapest return flights first.

Deals found on 14/7

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?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portsmouth to London Heathrow Airport as you normally would.

What is the cheapest day to fly from Portsmouth to London Heathrow Airport?

Travellers seeking maximum savings on their Portsmouth to London Heathrow Airport flight should consider departing on Saturday evenings 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.

Reviews of airlines servicing Heathrow

See what other customers who have flown with KLM, Aer Lingus, andBritish Airways from Portsmouth to London Heathrow Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

KLM

7.8

Good

1,372 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

KLM

7.8

Good

1,372 reviews

KLM

7.8

Good

1,372 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Aer Lingus

7.1

Good

1,165 reviews

KLM

7.8

Good

1,372 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

British Airways

6.6

Okay

7,134 reviews

KLM

7.8

Good

1,372 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Related info for your journey

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.
What is the cheapest month to book a flight from Portsmouth to London Heathrow Airport?
Currently, January is the cheapest month in which you can book a flight from Portsmouth to London Heathrow Airport (average of £112). Flying from Portsmouth to London Heathrow Airport in August is currently the most expensive (average of £164). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Milton Keynes

Croydon

Hounslow

Deal

Northampton

Gatwick

Slough

Luton

Wembley

Crawley

Eastbourne

Ilford

Hayes

Ipswich

Southend-on-Sea

Folkestone

Watford

Winchester

Swindon

Maidstone

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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.

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Cheap flights from Portsmouth to London Heathrow Airport from £94

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 6/10. Fares are subject to change and may not be available on all flights or dates of travel.

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 15 July 2025.

Round-trip from

One-way from

Find flight deals from Portsmouth to Heathrow

Cheapest flights from Portsmouth to HeathrowExplore 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 15 July 2025.

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 15 July 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Portsmouth to London Heathrow Airport that are best for you.

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.

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 15 July 2025.

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 13 July 2025.

Reviews of airlines servicing Heathrow

See what other customers who have flown with KLM, Aer Lingus, andBritish Airways from Portsmouth to London Heathrow Airport have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

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.

Can I find deals for flights from Portsmouth to Heathrow that include hotel bookings?

How can I find direct flights from Portsmouth to Heathrow?

Can I find deals for business class flights from Portsmouth to Heathrow?

What is the cheapest month to book a flight from Portsmouth to London Heathrow Airport?

Travelling to a place near London Heathrow Airport?

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.

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?

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

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

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

100% Free

Book with Flexibility

Travel Smart

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 15 July 2025.