Cheap flights from Portsmouth to London from £143
This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/11. Fares are subject to change and may not be available on all flights or dates of travel.
Cheap flight deals from Portsmouth to London
Keep the following information in mind while searching for Portsmouth to London flight deals. Data was last updated 17 October 2025.
Find flight deals from Portsmouth to London
Cheapest flights from Portsmouth to LondonExplore the most affordable flight options available from Portsmouth to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 October 2025.
Explore the most affordable flight options available from Portsmouth to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 October 2025.
Cheapflights Fare Finder
Use the filters below to find and compare flights from Portsmouth to London that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
SouthamptonLondon
SOU - LGW
SOULGW
Southampton Eastleigh
Wed 12/11
08:55-19:50
1 stop10h 55m
London Gatwick
Wed 19/11
11:15-19:40
1 stop8h 25m
SouthamptonLondon
SOU - LTN
SOULTN
Southampton Eastleigh
Wed 12/11
08:55-18:00
1 stop9h 05m
London Luton
Wed 19/11
06:50-15:35
1 stop8h 45m
SouthamptonLondon
SOU - STN
SOUSTN
Southampton Eastleigh
Sat 29/11
15:20-08:55
2 stops17h 35m
London Stansted
Sat 6/12
18:45-08:45
1 stop14h 00m
SouthamptonLondon
SOU - STN
SOUSTN
Southampton Eastleigh
Wed 12/11
12:25-18:20
1 stop5h 55m
London Stansted
Wed 19/11
06:30-15:35
1 stop9h 05m
SouthamptonLondon
SOU - LGW
SOULGW
Southampton Eastleigh
Sat 29/11
15:20-08:40
2 stops17h 20m
London Gatwick
Sat 6/12
17:45-08:45
1 stop15h 00m
SouthamptonLondon
SOU - STN
SOUSTN
Southampton Eastleigh
Tue 4/11
16:05-21:20
1 stop5h 15m
London Stansted
Thu 13/11
08:30-19:40
1 stop11h 10m
SouthamptonLondon
SOU - LTN
SOULTN
Southampton Eastleigh
Sat 15/11
13:55-21:55
1 stop8h 00m
London Luton
Sun 23/11
14:35-19:20
2 stops28h 45m
SouthamptonLondon
SOU - STN
SOUSTN
Southampton Eastleigh
Sat 15/11
15:20-07:15
2 stops15h 55m
London Stansted
Sun 23/11
20:00-19:20
2 stops23h 20m
SouthamptonLondon
SOU - STN
SOUSTN
Southampton Eastleigh
Thu 13/11
20:10-07:50
1 stop11h 40m
London Stansted
Thu 20/11
18:15-08:45
1 stop14h 30m
SouthamptonLondon
SOU - LTN
SOULTN
Southampton Eastleigh
Thu 13/11
16:05-23:05
1 stop7h 00m
London Luton
Thu 20/11
09:00-15:35
1 stop6h 35m
Best time to book a flight from Portsmouth to London
Have a flexible travel schedule? Discover the best time to fly to London from Portsmouth with our price prediction graph.
Cheapflights Insights
Everything you need to know about your flight from Portsmouth to London
What is the cheapest time of day to fly from P0R to LON?
Find hourly flight availability from Portsmouth to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 17 October 2025.
One of the essential ways to save on airfare from Portsmouth to London is to remain as flexible as possible. Flights that are in the afternoon tend to be the most expensive. A flight in the evening could potentially save you up to 37% on airfare.
What is the cheapest day to fly from Portsmouth to London?
Use this chart to determine the cheapest time to fly return from Portsmouth to London. Price data was last updated on 12 October 2025.
Travellers seeking maximum savings on their Portsmouth to London flight should consider departing on Monday 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 London. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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