The average bus between Trappes and Orsay takes 56 min and the fastest bus takes 43 min. There is a bus service every few hours from Trappes to Orsay. The journey time may be longer on weekends and holidays; use the search form on this page to search for a specific travel date.
Buses run hourly between Trappes and Orsay. The earliest departure is at 5:30 AM in the morning, and the last departure from Trappes is at 9:10 PM which arrives into Orsay at 9:53 PM. All services require a transfer, and take on average 56 min. The schedules shown below are for the next available departures.

1h 15m • 1 change

1h 14m • 1 change

1h 15m • 1 change

1h 15m • 1 change

1h 15m • 1 change

1h 14m • 1 change

1h 15m • 1 change

1h 15m • 1 change

53 min • 1 change

56 min • 1 change

57 min • 1 change

56 min • 1 change
Want to know about travelling from Trappes to Orsay? We have put together a list of the most frequently asked questions from our users such as: What is the cheapest mode of transport? What is the quickest option? How much do tickets usually cost? and many more.
No, there is no direct bus from Trappes to Orsay. However, there are services departing from Trappes station and arriving at Orsay station via Université Paris-Saclay. The journey, including transfers, takes approximately 56 min.
Trappes to Orsay bus services, operated by Lignes Île-de-France Ouest, depart from Lycée Émilie de Breteuil station.
Trappes to Orsay bus services, operated by Lignes Île-de-France Ouest, arrive at Université Paris-Saclay station.
The distance between Trappes and Orsay is 15.2 km. The road distance is 22 km.
Lignes Île-de-France Ouest operates a bus from Lycée Émilie de Breteuil to Université Paris-Saclay hourly, and the journey takes 36 min.