Fastest€19.59
- South Western Railway SW684006:2351m07:14London St Pancras InternationalPortsmouth Harbour
Door to door 1h 35mCO2 3.6 kgChanges 0Refundable
London to Portsmouth train
Trains from London to Portsmouth start at €15.74 and take 1h 35m at their fastest.
Check dates and fares
Fares and seats move by the day. Price London to Portsmouth on the date you actually want, rather than on the date this page was built.
The Trains from London to Portsmouth starts at €15.74 and takes 1h 35m door to door, run by 2 operators over 109 km, with around 4 departures a day. Fares bottom out about 90 days before departure.
- 1h 35mDoor to door
- 51mMoving
- €15.74 to €28.94From
- 06:23 to 14:36First and last departure
- 4Per day
- 3.6 kgCO2
First and last are taken from the services we sell on 29 September 2026. The return direction keeps its own timetable and is not these times reversed.
€15.74 to €28.94 for one passenger across the 14 departure dates priced here. The low end is one day, not every day. Typical for this corridor. The operator sets the price on the day.
Departure times on this route
12Go lists the departures it sells between London and Portsmouth.
Partner link. We earn nothing from this one.
South Western Railway runs this service and does not sell it here. Bookaway takes the payment.
Buying this journey
Bookaway lists departures for London to Portsmouth on your date, and you pay on their side.
See London to Portsmouth on Bookaway
Or compare on TrainlineOr compare on Trip.com
Partner link. We earn nothing from this one.
Fares by date
What this journey usually costs, by departure date. It shows which days run dearer.
Typical fares
- about €28.94Mon21
- about €22.89Tue22
- about €25.09Wed23
- about €25.09Thu24
- about €22.89Fri25
- about €24.54Sat26
- about €25.09Sun27
- about €19.59Mon28
- about €15.74Tue29
- about €16.29Wed30
- about €19.59Thu1
- about €17.94Fri2
- about €17.94Sat3
- about €17.94Sun4
Based on what this route has cost recently. The live fare is confirmed when you book.
The cheapest and the fastest on 29 September 2026
Train operators
| Operator | From |
|---|---|
| Great Western Railway | €12.44 |
 South Western Railway | €11.89 |
The train gets you into Portsmouth. These two partners take it from there, and the bed is theirs to book.
A room in Portsmouth for the night the train gets in
Sort by distance from Portsmouth Harbour and you can see which places are ten minutes on foot and which are not.
Search Portsmouth on Booking.comOr compare on Expedia
Partner links. We earn a commission when a booking completes, and it never changes what you pay.
When to book London to Portsmouth
The same search run across the whole booking window, so the shape of the curve is visible rather than described.
- €11.8890 days
- €11.8860 days
- €11.8845 days
- €11.8830 days
- €11.8821 days
- €11.8814 days
- €13.547 days
- €14.643 days
- €18.491 days
- Cheapest lead time
- Fares bottom out around 90 days ahead, at €11.88.
- How much it moves
- The gap between the cheapest and dearest lead time is 56 percent. The dearest point is €18.49, 1 days out.
- What that means
- Today sits inside the cheap window, which closes about 90 days before departure. Waiting from here has usually cost money on this corridor rather than saved it.
Which departure day costs least
Median cheapest fare for each weekday, taken across the next three weeks of real prices.
- €11.88Sun
- €12.44Mon
- €11.88Tue
- €11.88Wed
- €11.89Thu
- €12.44Fri
- €11.89Sat
Where you leave from and where you arrive
London
Rail
- London St Pancras International
- London Euston
- London Victoria
Portsmouth
Rail
- Portsmouth Harbour
- Fratton
- Portsmouth & Southsea
What the journey looks like
- Direct or connecting
- 60% of the services we sell on this corridor run through without a change. The remaining 40% involve one connection.
- How far it really runs
- The route covers 109 km against 104 km in a straight line, a detour of 5 percent. Track and road geometry account for the difference.
- Where the change is
- Connections are made at Weybridge, Surbiton, East Molesey, Hounslow. The gap between arriving and leaving is 53 minutes, of which about 5 is walking.
- If the connection is missed
- The tightest connection we sell here has a 18 percent chance of not being made on the timetable alone. Both legs are sold on one booking, so a missed connection is ours to fix and you are rebooked at no charge.
- First and last departure
- The first service of the day leaves London at 06:23 and the last at 14:36, across 4 departures The return direction keeps its own timetable, so the times back are not these times reversed.
Trains against the other ways to make this journey
| Mode | Door to door | Moving | At the ends | From | CO2 | Per day |
|---|---|---|---|---|---|---|
| Train | 1h 35m | 51m | 44m | €15.74 | 3.6 kg | 4 |
| Ferry | 5h 5m | 3h 35m | 1h 30m | €11.88 | 2.5 kg | 6 |
Questions about London to Portsmouth
The questions people actually ask about this journey, answered from the same prices and times the page above is built on rather than written once and left to go stale.
How long does the Train from London to Portsmouth take?
The Train from London to Portsmouth takes 1h 35m door to door, of which 51m is spent moving. The route runs 109 km. The difference between the two times is reaching the terminal and leaving it at the far end, which every time on this page includes.
How much does the Train from London to Portsmouth cost?
The Train from London to Portsmouth starts at €15.74 for one passenger, as of 20 September 2026. A typical fare is €18.49. Both are the total including taxes, supplier fees and our service fee, so the price here is the price at checkout.
Who runs the Train from London to Portsmouth?
2 operators run the Train from London to Portsmouth: Great Western Railway, South Western Railway. Between them they file around 4 departures a day. The operator table on this page compares them on fare, journey time, cruising speed, fare conditions and what is provided on board.
Which terminal does the Train from London to Portsmouth use?
The Train from London to Portsmouth leaves from London St Pancras International and arrives at Portsmouth Harbour. Allow about 44m for reaching the departure terminal and leaving the arrival one. That time is already inside every door to door figure quoted on this page.
Is the Train the best way from London to Portsmouth?
Travelling from London to Portsmouth by Ferry costs €11.88 and takes 5h 5m door to door, against 1h 35m by Train. Which is better depends on whether the money or the hours matter more on this trip. The comparison table on this page shows every mode side by side.
When should I book the Train from London to Portsmouth?
Fares for the Train from London to Portsmouth bottom out around 90 days ahead, at €11.88. The gap between the cheapest and dearest lead time across the window is 56 percent, measured on 20 September 2026. Booking inside the final week has consistently cost more.
How much CO2 does the Train from London to Portsmouth produce?
The Train from London to Portsmouth produces about 3.6 kg of CO2 per passenger over 109 km, which works out at roughly 33 grams per passenger kilometre. That figure is for the whole journey and for one traveller, not for the vehicle.
What is provided on board the Train from London to Portsmouth?
Operators on the Train from London to Portsmouth publish Power sockets, Wi-Fi. That is what 2 carriers on this corridor state about their own fleets, across a journey of 1h 35m door to door. Where a carrier publishes nothing, this page lists nothing for it.
Where these numbers come from
Places, coordinates, operators, which operator serves which pair, and every distance on this page are real and come from open data. Where a corridor has a filed timetable the departure times are real too, and ferry fares are the prices the operators publish themselves.
Observed service A carrier record names this operator on this pair, carried through unchanged.
Prices come from the supplier wherever we hold a live quote. Elsewhere we show an indicative price built from the real distance, the real operator and a fare curve over lead time, day of the week and season. Those are labelled Estimated fare and cannot be booked.
Defined in full at Door to door, Fares, The booking window, Carbon
- On this page
- Every figure above was computed for London to Portsmouth on 20 September 2026: 109 km of route against 104 km in a straight line, 4 services a day, 2 operators a cheapest fare of €15.74, and 1h 35m door to door on the fastest mode. The return direction is computed separately and its numbers are not these numbers.
Related journeys
Portsmouth to London trainCompare every mode from London to PortsmouthLondon to Portsmouth ferryArchway to Portsmouth trainBasingstoke to Portsmouth trainBath to Portsmouth trainBirmingham to Portsmouth trainBournemouth to Portsmouth trainBrent to Portsmouth trainBrighton to Portsmouth trainBristol to Portsmouth trainCardiff to Portsmouth trainCity of Westminster to Portsmouth trainCoventry to Portsmouth trainCrawley to Portsmouth train
Being on the water gives Portsmouth a set of days out that do not start at a station.
Day trips out of Portsmouth and across United Kingdom
Day trips that leave Portsmouth in the morning and cover a good part of United Kingdom by evening.
See Portsmouth on GetYourGuideOr browse Viator
Partner links. We earn a commission on a booking, and it never changes the price.