Getting to Mont Saint Michel by car
Driving is by far and away the most efficient way of visiting Mont Saint Michel. Within the region of Normandy, drive from Caen along the A84 south-west to Pontorson, then continue a few more kilometres to Avranches. Merge with the D43, following the signs to its Mont-St-Michel at its end. Parking costs €4.
From Paris the total driving time is about 4.5 hours.

Getting to Mont Saint Michel by train and bus
There are no direct train services between Paris and Mont St Michel, but rail travel to the island is nonetheless feasible. The best option is the TGV from Gare Montparnasse to Rennes, where a bus run by "Keolis Emeraude (ex Courriers Bretons)"( www.keolis-emeraude.com ) provides a 90 minute transfer to the island (there are 2-5 departures from Rennes per day, depending on seasonal demand - most departures are timed to match to the arrival of the TGV in Rennes). The bus station is immediately outside the Rennes train station, at a bus terminal building on your right, after leaving the station by the north exit. The bus costs around €11, with a reduction to around €9 for people under 25 or older than 60, a reduction to around €6 for children under 12, and it's free for children under 4. Bus tickets are sold by the driver when boarding the bus, not in advance at the bus terminal.

When returning with the bus, the driver might ask if you have a reservation for the TGV to Paris and give priority to people who have one.

Note: the bus stops at the entrance to the Mont St Michel itself. You can also ask the driver if you want to stop to the hostel before Mont St Michel.

Another option is to take a TGV train to the Pontorson-Mont St Michel train station (up to 4 a day), with a stopover in Rennes. The Pontorson train station is no more than 15 minutes from Mont St. Michel. Buses are available several times a day. You can get a schedule from the Pontorson train station.

There are also two buses daily from Saint-Malo to Pontorson (line 17, 1 hour, around €3.50 single trip), which are timed to connect to buses to Mont St Michel (€2.50 single trip).

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Based on a work at Wikitravel.org & Traveldudes.org.