Heathrow only has a train service into London, in the form of Heathrow Express, Heathrow Connect and London Underground (tube, which is metro or subway in other countries). The easiest way to Truro is via Reading on the Railair Bus Service and train. This train is the London Paddington to Truro main line express, Reading is a major station en route. Use the National Rail web-site to check train services and fares and Railair for the bus.
…nationalrail.co.uk/service/…search (Use station RDG)
Your problem won't be finding a train to Truro, but getting the right ticket.
"Advance" fares (in this case, Reading to Truro) can be had for as little as £23. The problem with these is that they are for a specific timed train on a specific day, and if you miss the train they are worthless. An international flight, getting through UK Border Control, and even the road journey from Heathrow Airport to Reading are all sources of potential delay.
If you can manage to fly in on a Saturday or Sunday, you can at least avail yourself of the cheapest "Super Off-Peak" ticket that allows you to take any train that day, this cost £54.50 and is a walk-up ticket that can be bought at Reading Station on the day for immediate travel. Super Off-Peak tickets are also available for travel on Monday-Friday, but only on trains departing Reading between 10.33 and 15.33, or at 19.34. There is also an "Off-Peak" ticket for £71.20 (again, this is a walk-up fare) which is valid on all trains Monday-Friday except for the 07.59 or the 17.30 - if you want to buy an "Anytime" ticket which will allow you to travel on these two trains it will cost you a whopping £139.50
All these are single (one-way) fares in Standard Class, and may be increased slightly in January 2017.
I would recommend not buying an Advance ticket when flying in, and opting instead for a more flexible walk up ticket.
Great! Your input is very much appreciated. I came very close to clicking "buy" for an advance ticket but I have decided not to.
Get a taxi to West Drayton station (around £10, takes 15 minutes) and take a train from there: that way you avoid any problems with the motorway to Reading.
That seems a great idea, Roman, all the times this question has been posted not been suggested before? Need to clarify for visitors: From West Drayton there are local trains to Reading, about 30 minute journey. the ticket to Truro (& return) can be bought at West Drayton. Overall costs and times about the same either method.
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