Donostia-San Sebastián is located in the northeast of the Spanish Basque Country: 110 km from Bilbao, 500 km from Madrid, and 800 km from Paris. It is a charming medium-size city set in a picturesque countryside, on the edge of the Gulf of Biscay and surrounded by mountains. A city of deep-rooted international tourist traditions dating back to the 19th century, San Sebastián offers quite a few attractions, a varied choice of hotels and, above all, what is now one of the most creative gastronomies in the world.
You can find more information about the city, including detailed instructions on how to get here, at https://www.sansebastiancongress.com/en/mice-city/how-to-get-here#plane
For more general information about the Basque Country see http://www.euskadi.net