Hi,
@Valery. I just did a quick post of the R2R link because its about the best resource for multiple route planning. There are two companies providing bus services to Pamplona from Bilbao, both listed on R2R if you click on the options on the left hand side of the screen. However you are unlikely to find a bus to Roncesvalles this time of year. The two companies that do run to Roncesvalles, and one onward to St Jean pied de la Porte, have not published timetables for the winter period that I can find. If you are determined to start your camino from Roncesvalles at this time of year then you will need to hire a taxi from Pamplona. Of course you could just start your camino in Pamplona. There are no rules.
If your plane lands Bilbao at 1:00pm then you have a reasonable chance, after Border Control and catching the airport shuttle to Bilbo Termibus (Bilbao Bus Station) to catch the 3:30 bus run by Autobuses La Union that will get you into Pamplona around 5:30pm. If you miss the 3:30 you will need to spend the night in Bilbao, something I would always be happy to do. A taxi to Roncesvalles will take about 45 minutes and cost iro €50.