One way is more expensive than taking a return.
Therefore I would recommend you to take a return ticket including a week-end between your two tickets, even if you don't use your return.
If you plan ahead and buy following the return/week-end rule, you should be able to get a ticket for as little as £70 return.
On average, tickets are around £100 though which is cheaper than flying. (no taxi to airport...)
it is around £100 for adult on return in 1st class
The prices vary depending on what pass you have. Some passes only support one country, and others support up to 22 countries. The prices range from $49 to $509.
About id say maybe 150-300 euros
London is a large city, so it will depend on which part of London you are travelling from.
According to the National Rail Enquiries website, the single fare is £8.30
Eurostar train fare from Paris to Brussels ranges from $82 USD to $137 USD, though that is the price for economy seats. The least expensive fare is for the trains that depart earlier in the morning, while the more expensive ones depart later in the day.
There is a train about every 20 minutes and the fare is around £30
i don't know buddy
Around £25
London St Pancras International - Paris takes about 2hr 15 min
Paris breaksSince November 2007 the departure station in London is St Pancras. That's right next to Kings Cross on the circle line. As with so much of the leisure and transport industry these days, the prices are variable depending on the demand for particular times and dates. The best offers are usually for two people at the price of one and sometimes a Saturday night stay over is obligatory.A full price EuroStar fare can be around £250 return fare. Look at the EuroStar website https://www.eurostar.com/ you can play around with dates and find a decent price. Booking a month or two early also helps lower the cost of your fare.
A RER ticket costs 4.20 €, full fare adult, from Paris centre to Versailles on Jan 2014.
According to the official website - a one-way ticket from Paris to London costs £138.
Anytime off-peak adult single is £8.10. Return from £9.20.
Eurorail is famous for providing affordable train passes to non-European residents for use on trains and ships. Its a great way for students or travelers to explore the the countries without spending too much money.