How to get train and bus tickets?

1. Use the “Ile de France mobilité” app on your smartphone. The download link is available at https://www.iledefrance-mobilites.fr/en/application
   It allows buying tickets directly on your smartphone, or buying tickets that are loaded on your "Navigo Easy" pass

2. If you don't use your smartphone to buy tickets, you can buy a “Navigo Easy” pass at a metro/train station. It is a kind of Metro Card on which you can then load your tickets (bought at the station, 2 €).
   Note that you can always use your smartphone afterwards to reload your “Navigo Easy” pass.

3. If you are lost, do not hesitate to go to the ticket office for assistance.

Tickets to be loaded on your smartphone or on the "Navigo Easy" pass at the airport:

1. Buy only 1 ticket “Paris region Aéroport” to get from Roissy or Orly Airport to any metro-train-RER station: 13 €

2. Buy 3 “bus-tram” tickets (€ 2 each):

   • 1 to take the bus to the residence on the day of your arrival, 

   • 1 to go to the building "Bâtiment 503" on June 9th for the first day of the summer school (see below),

   • 1 to take the return bus from the residence to the train station.

Beware: 

For technical reason you cannot load on your smartphone or pass both a “Paris region Aéroport” ticket and a metro-train-RER ticket. So for example, if you plan to take the RER B train to go to Paris during your stay, don’t buy a “Paris region Aéroport” return ticket, you can buy the return ticket later, no problem.

An application for routes and timetables: citymapper

To find timetables or route information, you can install the citymapper app on your smartphone, which is very useful (also available on the web). 

From airports to Massy-Palaiseau RER B train station (“Paris region Aéroport” ticket, 13 €)

• Roissy Airport: Take south-bound RER B (direction "Saint-Rémy-les-Chevreuses" or "Massy-Palaiseau") to Massy-Palaiseau station 

Work is being carried out on the RER B line, so part of the line is out of service, but there is a replacement bus.

• Orly Airport: Take the "Orlyval" automatic metro to Antony (RER B). Take south-bound train to Massy-Palaiseau.

From Massy-Palaiseau RER B train station to the residence (bus-tram ticket, 2 €) 

• At Massy-Palaiseau, take exit in front of train and follow signs to "gare routière Atlantis-Sud", then to "bus 91.06" (down the stairs).

• Take Bus 91.06 to bus stop "Ferme de la Vauve" for All Suites or "Place Marguerite Perey" for Kley.

On Sundays and holiday, there is only 1 bus per hour, the whole schedule can be dowloaded here.

The address of the IOGS headquarters is:
Institut d'Optique Graduate School - Paris Saclay
2 avenue Augustin Fresnel
91120 Palaiseau, France

It is very close to the residences All Suites Study and Kley.

Directions

1. Take south-bound RER B (direction "Saint-Rémy-les-Chevreuses" or "Massy-Palaiseau") to Massy-Palaiseau station (metro/RER ticket, 2.50 €) 

2. At Massy-Palaiseau, take exit in front of train and follow signs to "gare routière Atlantis-Sud", then to "bus 9106" down the stairs (bus/tram ticket, 2 €)

3. Take bus 91.06

   • For All Suites Study Paris Saclay: bus stop "Ferme de la Vauve" (bus ticket, 2 €) 

   • For Kley or IOGS: bus stop “Place Marguerite Perey”.  The IOGS headquarters is behind you, on the other side of the crossroads. 

On Sundays and holiday, there is only 1 bus per hour, the whole schedule can be dowloaded here.

If you feel like walking 30 mins to avoid taking the bus:

• Take south-bound RER B (direction « Saint-Rémy-les-Chevreuses ») to “Orsay ville” station (RER ticket, 2.50 €) 

• Take the “rue Elisa Desjobert” down to the Yvette river (see map below).

• After crossing the Yvette, take the “rue du Château”. Follow the rue du Château until you cross the “rue de Chevreuse”, then take the “rue du doyen Joseph Pères”.

• After first right turn, take pedestrian path to the left which leads to the “rue du Belvédère”. Follow the rue du Belvédère to Bâtiment 503.

Total walking time from RER station is 25-30 minutes, depending on your physical condition (steep slope!)

⚠️BEWARE: because of holiday, there is only 1 bus per hour to go from the residence to Bâtiment 503 on June 9th morning

So be at the bus stop a few minutes before the schedule given below.

From All Suites Study Paris Saclay: 

1. Take at 8:12 AM the bus 91.06 at bus stop “Palaiseau Campus”, direction “Christ de Saclay”

2. Stop at “Université Paris Saclay”

3. Walk 12 mins to reach Bâtiment 503, map is here.

From Kley:

1. Take at 8:12 AM the bus 91.06 at bus stop “Place Marguerite Perey”, direction “Christ de Saclay”

2. Follow instructions 2 and 3 given above

If you need to go directly to Bâtiment 503 from central Paris:

1. Take the RER B to reach the train station Massy-Palaiseau

2. Take the bus 5154 or 91.06 from "Gare de Massy-Palaiseau" (1 bus per hour)

3. Stop at "Université Paris-Saclay". There is only 1 bus per hour. Use citymapper app or the schedules given below.

   • schedule for bus 5154

   • schedule for bus 91.06

4. Walk 12 mins to reach Bâtiment 503, map is here.