Billings is served by Billings Logan International Airport (BIL), the largest airport in Montana and a key regional hub. It provides essential air connectivity for the state, with arrivals coming primarily from major domestic hubs and a limited number of direct leisure destinations. Most inbound flights are operated by network carriers, with one low-cost airline offering occasional deals.
The most vital arrival routes into Billings come from major airline hubs in the Western and Central U.S. Key origin cities include Denver (DEN) on United and Frontier, Salt Lake City (SLC) on Delta, Minneapolis (MSP) on Delta, Seattle (SEA) on Alaska, and Chicago (ORD) on United. There are also direct seasonal arrivals from leisure cities like Las Vegas (LAS) and Phoenix (PHX), though these tend to be more expensive and less frequent than hub routes.
Billings Logan is served by major network carriers: Delta Air Lines, United Airlines, and American Airlines (via its partners) all fly into BIL from their respective hubs. Alaska Airlines and Frontier Airlines provide important competition on specific routes — Frontier, in particular, offers a low-cost option primarily from Denver (DEN), which is often the cheapest way to reach Billings if you book at the right time.
To find affordable flights to Billings, book inbound flights from hub cities (e.g., Denver, Salt Lake City, Minneapolis) about 3–6 weeks in advance. For Frontier's low-cost fares from Denver, book 1–2 months ahead but be mindful of their fees for bags and seat selection — the base fare may look cheap but can add up quickly. Use flight comparison tools and check both network carriers and Frontier side by side. Flying into Billings on weekdays (Tuesday–Thursday) is typically cheaper than weekends. For travelers coming from outside the U.S., the most economical strategy is almost always to fly into Denver (DEN) or Salt Lake City (SLC) first — both have extensive intercontinental service — and then book a separate domestic ticket to BIL. Due to limited competition at BIL, fares can be higher than into larger cities, so booking early is essential for the best prices.