Boise to Madrid (BOI–MAD) — Airlines, Schedules & Connections

US passport holders enter Spain visa-free for stays up to 90 days within any 180-day period. This falls under the Schengen area rules, so the 90-day limit is shared across all Schengen countries. No advance application is needed. Passport must be valid for at least 3 months beyond the planned departure from the Schengen area.

Metro Line 8 from T1/T2/T3 to Nuevos Ministerios takes 12–15 minutes (€6 with airport supplement). T4 travelers take the free inter-terminal shuttle to T2 first. Cercanías C-1 from T4 to Atocha (€2.60, 25 min) is cheaper. Taxis to the city centre have a €30 fixed tariff.

Rental car agencies are at T4. Express Aeropuerto buses run 24 hours to Avenida de América (€5, 25–40 min). Ride-hail apps (Cabify, Uber) typically cost €25–40 depending on destination.

Hot semi-arid climate at 600m altitude. Summers are hot and dry (30–38°C) with almost no rain and very low humidity. Heat rarely disrupts flights but ground crews work in extreme heat. Winters are cold for a southern European capital (1–9°C) with occasional snow. MAD handles light snow well but heavy falls can close runways.

Spring and autumn are pleasant (12–20°C) and offer the most stable weather. Dust storms from the Sahara occasionally reduce visibility in spring. No fog risk comparable to northern European airports.