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Paris to Brussels?

Is this a do-able day trip?

Is the high speed Thalys train my best option?

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8700 posts

A day trip is certainly feasible. It's a 1hr23min ride on Thalys trains.

A Comfort 2 (2nd class) return (roundtrip) ticket called Mezzo costs 122€. Subject to availability, a Mezzo + ticket costs 90€.

If you book far enough ahead (up to 90 days allowed) at, you can get a Smilys return fare of 55€ or a Mini single fare of 25€ each way. You must book as soon as the 90-day window opens to have any chance of getting those fares.

Right now Thalys is offering a spring special of 41€ each way. Book by 16 April for travel no later than 19 June.

Go to Choose France and English and you'll be able to complete the booking process in English.