The average bus between Trappes and Orsay takes 1h 3m and the fastest bus takes 50 min. The bus runs at least 2 times per hour 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 every 30 minutes between Trappes and Orsay. The earliest departure is at 5:30 AM in the morning, and the last departure from Trappes is at 10:03 PM which arrives into Orsay at 11:16 PM. All services require a transfer, and take on average 1h 3m. The schedules shown below are for the next available departures.

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52 min • 1 changeWant 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 Lycée Émilie de Breteuil station and arriving at République station via Christ de Saclay station. The journey, including transfers, takes approximately 1h 3m.
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 Paris-Saclay Mobilités, arrive at République station.
The distance between Trappes and Orsay is 15.2 km. The road distance is 19 km.
You can take a bus from Lycée Émilie de Breteuil to République via Christ de Saclay in around 1h 10m.