Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Billings to Salou as you normally would.
For a flight from Billings to Salou, you will be flying from Billings Logan Intl. Billings Logan Intl (BIL) is just 2.7 mi from the center of the city. Billings Logan Intl is the only Billings airport and it handles 0 outbound flights to Salou per day. 0 airlines have flights to Salou from Billings Logan Intl on a regular basis.
BIL and BCN are unique codes to identify airports used in the aviation industry. They are defined by IATA (International Air Transport Association) and are commonly called IATA codes. BIL to BCN refers to a flight route from Billings Logan Intl Airport to Barcelona-El Prat Airport. This flight route has multiple associated airports, so we think it might be helpful to learn the name and codes of them as well. They are Reus Airport (REU), Castellón de la Plana Airport (CDT), La Seu d'Urgell Aeroport De La Seu Airport (LEU), Lleida-Alguaire Airport (ILD).