Cheap flights from Portsmouth to London Heathrow Airport from £140
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 28/11. Fares are subject to change and may not be available on all flights or dates of travel.
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 16 October 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 16 October 2025.
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 16 October 2025.
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
Tue 11/11
08:15-14:25
1 stop6h 10m
London Heathrow
Tue 18/11
18:50-15:35
2 stops20h 45m
SouthamptonLondon
SOU - LHR
SOULHR
Southampton Eastleigh
Wed 12/11
16:05-21:05
1 stop5h 00m
London Heathrow
Wed 19/11
07:50-15:35
1 stop7h 45m
SouthamptonLondon
SOU - LHR
SOULHR
Southampton Eastleigh
Wed 29/10
14:25-19:30
1 stop5h 05m
London Heathrow
Sun 2/11
05:50-16:50
1 stop11h 00m
SouthamptonLondon
SOU - LHR
SOULHR
Southampton Eastleigh
Sat 29/11
09:25-17:00
1 stop7h 35m
London Heathrow
Sat 6/12
11:15-17:00
1 stop5h 45m
SouthamptonLondon
SOU - LHR
SOULHR
Southampton Eastleigh
Sat 15/11
09:30-16:35
1 stop7h 05m
London Heathrow
Sun 23/11
06:50-11:50
1 stop5h 00m
SouthamptonLondon
SOU - LHR
SOULHR
Southampton Eastleigh
Sat 8/11
17:30-07:40
1 stop14h 10m
London Heathrow
Mon 10/11
20:25-08:10
1 stop11h 45m
SouthamptonLondon
SOU - LHR
SOULHR
Southampton Eastleigh
Sat 1/11
09:30-16:20
1 stop6h 50m
London Heathrow
Wed 24/12
07:00-10:55
1 stop3h 55m
SouthamptonLondon
SOU - LHR
SOULHR
Southampton Eastleigh
Mon 30/3
12:35-17:55
1 stop5h 20m
London Heathrow
Tue 31/3
14:05-17:40
1 stop3h 35m
SouthamptonLondon
SOU - LHR
SOULHR
Southampton Eastleigh
Thu 30/10
09:30-16:50
1 stop7h 20m
London Heathrow
Mon 3/11
08:50-15:35
1 stop6h 45m
SouthamptonLondon
SOU - LHR
SOULHR
Southampton Eastleigh
Wed 12/11
14:25-21:05
2 stops6h 40m
London Heathrow
Wed 19/11
07:00-18:30
1 stop11h 30m
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 16 October 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 48% 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 12 October 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.
Travelling to a place near London Heathrow Airport?
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Alternative routes for Portsmouth to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.
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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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