MAIN OPTIONS BY PLANE: Boston-Madrid-Pamplona Boston-Barcelona-Pamplona Boston has direct flights to Madrid and Barcelona with several airlines. Other options: Boston-Madrid by plane. Then, train or bus to Pamplona. Boston-Barcelona by plane. Then, train or bus to Pamplona. Boston-Madrid- Bilbao by plane. Then, Bus to Pamplona Official website for trains in Spain: https://www.renfe.com/es/en There are other combinations that may be more convenient for you. Ask us if any issue.