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Cheap flights from London Heathrow Airport to Portsmouth from £91

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 26/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — LHR
18 Jun — 25 Jun1
1 adult

Cheap flight deals from Heathrow to Portsmouth

Keep the following information in mind while searching for Heathrow to Portsmouth flight deals. Data was last updated 13 June 2025.

Round-trip from

£255

One-way from

£91
KLM
  • KLM
  • 27/9-8/10
  • 2 total stops
  • 15h 50m total
  • London to Portsmouth
Search Deals
26/6
  • 26/6
  • 1 total stop
  • 24h 35m total
  • London to Portsmouth
Search Deals

Find flight deals from Heathrow to Portsmouth

Cheapest flights from Heathrow to Portsmouth
Explore the most affordable flight options available from Heathrow to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 June 2025.

Sat 27/911:45LHR - SOU
1 stop5h 45mKLM
Wed 8/1009:20SOU - LHR
1 stop10h 05mKLM
Deal found 11/6£255
Thu 10/714:20LHR - SOU
1 stop5h 10mMultiple Airlines
Sat 19/708:25SOU - LHR
1 stop10h 25mMultiple Airlines
Deal found 11/6£298
Mon 29/1212:30LHR - SOU
1 stop3h 45mBritish Airways
Mon 12/111:40SOU - LHR
1 stop4h 20mBritish Airways
Deal found 12/6£319
Sat 5/720:10LHR - SOU
1 stop12h 25mAer Lingus
Wed 9/709:10SOU - LHR
1 stop4h 45mAer Lingus
Deal found 11/6£360

Cheapflights Fare Finder

Customise your flight search to find flights from Heathrow to Portsmouth 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 13 June 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Portsmouth that are best for you.

Fly from

Heathrow

Fly to

Portsmouth

Route

Depart

Return

Price

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sat 27/9

11:45-17:30

1 stop5h 45m

Southampton Eastleigh

Wed 8/10

09:20-19:25

1 stop10h 05m

£255

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Thu 10/7

14:20-19:30

1 stop5h 10m

Southampton Eastleigh

Sat 19/7

08:25-18:50

1 stop10h 25m

£298

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Mon 15/9

07:45-12:40

1 stop4h 55m

Southampton Eastleigh

Mon 15/9

16:45-20:50

1 stop4h 05m

£321

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sat 5/7

20:10-08:35

1 stop12h 25m

Southampton Eastleigh

Wed 9/7

09:10-13:55

1 stop4h 45m

£360

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Thu 26/6

15:05-15:40

1 stop24h 35m

£91

LondonSouthampton

LHR - SOU

LHRSOU

London Heathrow

Sun 27/7

08:00-12:40

1 stop4h 40m

£164

Flights are sorted by cheapest return flights first.

Deals found on 12/6

Best time to book a flight from Heathrow to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Heathrow 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 London Heathrow Airport to Portsmouth

What is the cheapest time of day to fly from LHR to P0R?

Find hourly flight availability from Heathrow to Portsmouth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 13 June 2025.

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

Rainfall in Portsmouth by month

Plan your trip to Portsmouth by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Portsmouth ranges from 25.0 - 76.0 inches per month. December is typically the wettest month, when rainfall can reach 76.0 mm. July is typically the driest time to visit Portsmouth when rainfall is around 25.0 mm.

Temperature in Portsmouth by month

Plan your trip to Portsmouth by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Portsmouth, 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 18.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 4.0 C).

Reviews of airlines servicing Portsmouth

Get insights into the airlines that provide service to Portsmouth. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portsmouth. Reviews last updated 13 June 2025.
KLM
7.8
Good
1,358 reviews
Check prices

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
KLM
7.8
Good
1,358 reviews
KLM
7.8
Good
1,358 reviews
Check prices

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
Aer Lingus
7.1
Good
1,118 reviews
KLM
7.8
Good
1,358 reviews
Check prices

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.
British Airways
6.6
Okay
7,011 reviews
KLM
7.8
Good
1,358 reviews
Check prices

Entertainment

7.1

Boarding

7.8

Comfort

7.7

Food

7.2

Overall

7.8

Crew

8.4

Reviews

1 / 20
8.0
Excellent

Allan,Jun 2025

YYZ - AMS

I always enjoy flying KLM. Service is attentive, friendly and professional. The seat, when fully reclined is a little hard; some kind of mattress or topper would be helpful here. The dinner was really not very good …. “Meatless meatballs” tasted quite peculiar. Breakfast which consisted of an egg white omelette in flour tortilla was also rather tasteless.

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Portsmouth. 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 Heathrow to Portsmouth that include hotel bookings?

    Yes. In addition to deals on Heathrow to Portsmouth flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Portsmouth?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Portsmouth.

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

    Yes. Cheapflights offers flight deals from Heathrow to Portsmouth 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 London Heathrow Airport to Portsmouth?

    Currently, January is the cheapest month in which you can book a flight from London Heathrow Airport to Portsmouth (average of £112). Flying from London Heathrow Airport to Portsmouth 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

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