Missoula, Montana · Small hub · #142 of 458 by 12-month departing passengers screened
Missoula Montana Airport (MSO) screened about 606,000 departing passengers at TSA checkpoints in the 12 months to September 30, 2026, up 4.2% on the prior 12 months. That ranks MSO 142nd of 458 US airports by departing passengers screened in Passenger Index's data.
12 months October 1, 2025 to September 30, 2026 · published figures rounded to 3 significant figures. TSA data covers 351 of the 365 days; the annual figure is scaled to a full year.
| Month | Departing passengers screened (TSA) |
|---|---|
| September 2026 | 54,207 |
| August 2026 | 65,163 |
| July 2026 | 77,718 |
| June 2026 | 62,041 |
| May 2026 | 48,526 |
| April 2026 | 40,754 |
| March 2026 | 42,974 |
| February 2026 | 36,107 |
| January 2026 | 39,251 |
| December 2025 | 45,502 |
| November 2025 | 40,521 |
| October 2025 | 48,641 |
Exact monthly totals for complete calendar months. A month with too few reported days shows "—". Year-over-year change by month, the latest 7 and 30 days and weekly data are in the paid plans.
| Year | Departing passengers screened (TSA) | YoY |
|---|---|---|
| 2025 | 584,767 | +5.8% |
| 2024 | 553,408 | +12.1% |
| 2023 | 492,151 | +10.8% |
| 2021 | 410,594 | +79.1% |
| 2020 | 230,002 | -54.4% |
Complete calendar years with a full set of monthly data. Year-over-year compares the same dates, using only days reported in both years.
How these numbers are built and what they do not count →
This page shows 12-month, monthly and annual totals. Premium subscribers get MSO's latest 7- and 30-day passengers with year-over-year change, daily and weekly history back to 2015, the full checkpoint series, Airport Data for every US airport, and CSV and Excel downloads - data through October 3, 2026.
Missoula Montana Airport (MSO) screened about 606,000 departing passengers at TSA checkpoints in the 12 months to September 30, 2026, up 4.2% on the prior 12 months. That ranks MSO 142nd of 458 US airports by departing passengers screened in Passenger Index's data.
In September 2026, 54,207 departing passengers were screened at TSA checkpoints at Missoula Montana Airport (MSO), according to Passenger Index's compilation of TSA FOIA throughput data.
In the 12 months to September 30, 2026, departing passengers screened at MSO were up 4.2% year over year. Year-over-year compares the same 365 days a year earlier, using only days reported in both years.
MSO is a small hub in Passenger Index's FAA-style classification: it handled 0.1% of national TSA checkpoint throughput in the 12 months to September 30, 2026 (0.05% to 0.25% is the small hub band). The FAA's official hub classes use calendar-year enplanements, so they can differ slightly.
No. MSO is not one of the airports in CBP's Airport Wait Times data, so there is no international-arrivals figure. The departing figure still counts passengers bound for international destinations, because TSA screens them like everyone else.
Not from this data. TSA screening does not record where a passenger is flying, and CBP counts international arrivals only, so there is no international-departures figure to subtract. The two series measure opposite directions and are shown side by side, never added.
Airports usually report enplaned plus deplaned passengers, counting every arriving and departing passenger including connections. TSA counts departing passengers once, at screening; arrivals and connecting passengers who stay airside are not screened again, so this measure runs well below airport-reported totals, especially at connecting hubs.
TSA checkpoint throughput by airport from the TSA FOIA reading room and passengers processed from CBP Airport Wait Times, both US federal public-domain data, compiled and validated by Passenger Index. The 12-month headline is rounded to three significant figures; the monthly and annual tables are exact. Passenger Index Premium has the full daily series.
Passenger Index, "Missoula Montana Airport (MSO) passenger traffic", 12 months to September 30, 2026. https://passengerindex.com/web/airports/mso/