The RER A, the Eurostar and several TGV lines all stop at the Chessy/Marne-la-Vallée station.
Free shuttle buses run every 20 minutes (40 minutes during off-peak hours), from 8:00 AM until 2 hours after the closing of the Disney parks, to take you to the hotel entrance.
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Check shuttle schedule
Check park opening hours
The bus 2234 also drops you off just a 5-minute walk from the hotel, from 5:00 AM to 2:00 AM
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Check bus schedule