The Francisco Sá Carneiro in Porto (OPO) airport is the nearest International airport. Many airlines, such as Lufthansa, Air Europa, Iberia, KLM and Aer Lingus, fly into Porto, including the low cost Ryanair and EasyJet.
The conference organisation will provide a bus service from Porto-Bragança and Bragança-Porto (Francisco Sá Carneiro Airport - Porto), on Monday 13th September and on Saturday 18th September (2 hours by bus)
Alternatively, there are daily bus connections from Porto to Bragança. The following bus companies travel to and from Bragança, and you can purchase your tickets online.
Rede Expressos https://www.rede-expressos.pt/
The principal motorway is the estrada A4 connecting the cities of Porto, Penafiel, Amarante, Vila Real, Mirandela and Bragança.