Train
Driving
Caernarfon to Portsmouth
Updated: 30 May 2026
The journey from Caernarfon to Portsmouth covers 420 km. The most efficient route is via the A55, M56, M6, and M3. This journey takes you from the Welsh coast through the heart of England into the naval city of Portsmouth. It is a significant cross-country trip requiring careful planning. Expect a 5.5-hour drive depending on traffic.
Total Distance: Driving distance 420 km, straight-line air distance 350 km.
Fastest Way
Driving is the fastest option.
Cheapest Way
Driving is the most cost-effective for groups.
Compare Caernarfon to Portsmouth Routes
|
Connecting
|
Direct
|
|
|---|---|---|
| Duration | 7 hours 30 mins | 5 hours 30 mins |
| Avg Price | £130 - £220 | £65 - £90 fuel |
| Operator | Transport for Wales and SWR | Personal Vehicle |
| Route | Caernarfon to Bangor, then train to Portsmouth. | A55, M56, M6, M3. |
| Tip | Book in advance for cheaper tickets. | The M3 can be very busy. |
Travel Tips
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DrivingCheck for traffic on the M3.
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ParkingPortsmouth has many car parks.
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WalkingThe city center is walkable.
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BookingNo booking needed for driving.
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WeatherPortsmouth can be windy.
Safety Tips
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DrivingStay alert on the M3.
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GeneralKeep your belongings safe.
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EmergencyDial 999 for help.
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CityBe aware of your surroundings.
People Also Ask
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Is it a long trip?Yes, it is about 5.5 hours.
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Are there trains?Yes, via Bangor.
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Is parking easy?Yes, plenty of options.
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Can I cycle?Not practical for this distance.
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Is it scenic?Yes, especially near the coast.
Quick Info
- From Caernarfon, Gwynedd, United Kingdom
- To Portsmouth, England, United Kingdom
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Modes
Best Time to Travel
Spring and Autumn for mild weather.
Things to Do in Portsmouth
1
Historic Dockyard
A historic site.
2
Spinnaker Tower
A landmark tower.
3
Southsea Castle
A historic castle.
4
Gunwharf Quays
A shopping center.
Tags
Caernarfon to Portsmouth
driving to Portsmouth
A55 and M3
Wales to England
Portsmouth travel
long distance travel
Gwynedd to Hampshire
travel guide
