Terminals · BWI
Frontier departs from Terminal D at Baltimore/Washington International Thurgood Marshall Airport (BWI). We verified this against the airport's own sources on June 27, 2026 — airlines do move terminals, so we date every check.

Frontier departs from Terminal D at Baltimore/Washington International Thurgood Marshall Airport (BWI). Concourse D (shared domestic concourse). Verified June 27, 2026.
Ticketing on Main Terminal Upper Level (Departures); proceed via the D/E security checkpoint. Bag drop usually closes 45 minutes before departure, so build that into your morning.
Not that we've found. We confirmed Frontier departs from Terminal D at BWI as of June 27, 2026. Airlines do shuffle terminals, so we re-check and date every change.
Frontier flies non-precleared international routes (e.g., Cancun); such arrivals are processed at BWI's federal inspection facility in Concourse E, but Frontier's departures/check-in are in Concourse D.
Not sure which building that is? See all BWI terminals with the airport map and how to get between them. Then let your Leave-By Time count backward from your flight — today's BWI security wait, your drive, and the walk to your gate — so you leave with room to breathe.