17 destinations have scheduled flights from BIL, about 109 departures a week. Weekly frequencies come from airline schedules and observed departures, not live status.
| Destination | Flights per week | Airlines | Typical duration |
|---|---|---|---|
| Sidney - Richland Regional Airport (SDY) | 14 | Hyannis Air Service, Inc. d/b/a Cap | — |
| Dallas Fort Worth International Airport (DFW) | 13 | Envoy Air Inc. | — |
| Portland International Airport (PDX) | 13 | Alaska Airlines | — |
| Glasgow Valley County Airport Wokal Field (GGW) | 11 | Hyannis Air Service, Inc. d/b/a Cap | — |
| Dawson Community Airport (GDV) | 8 | Hyannis Air Service, Inc. d/b/a Cap, LaneXang | — |
| Salt Lake City International Airport (SLC) | 8 | Delta Air Lines, UPS Airlines | — |
| Denver International Airport (DEN) | 7 | Albatross Airlines | — |
| Seattle–Tacoma International Airport (SEA) | 7 | Alaska Airlines | — |
| Havre City County Airport (HVR) | 6 | Hyannis Air Service, Inc. d/b/a Cap | — |
| Great Falls International Airport (GTF) | 5 | Empire Airlines | — |
| L M Clayton Airport (OLF) | 5 | Hyannis Air Service, Inc. d/b/a Cap | — |
| Louisville Muhammad Ali International Airport (SDF) | 5 | UPS Airlines | — |
| Mesa Gateway Airport (AZA) | 3 | Allegiant Air LLC | — |
| Bozeman Yellowstone International Airport (BZN) | 1 | LaneXang | — |
| Cut Bank International Airport (CTB) | 1 | LaneXang | — |
| Glacier Park International Airport (FCA) | 1 | LaneXang | — |
| Northeast Wyoming Regional Airport (GCC) | 1 | LaneXang | — |
GET /routes returns each scheduled flight from BIL: airline, flight number, departure and arrival time, duration, days of operation and aircraft type.
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