Airports › Montana
Airport · 12 months to July 2026
Great Falls International: delays and on-time record
Great Falls, Montana
BTS: A flight is counted as on time if it arrived less than 15 minutes after its scheduled time. Only carriers with at least 0.5 percent of domestic scheduled passenger revenue report. Data through July 2026; this is a monthly history, not live airport status.
Great Falls International (GTF) in Great Falls, Montana had 2,168 scheduled domestic departures by reporting carriers in the 12 months to July 2026, about 6 a day, on 7 routes.
88.2% of those flights left the gate less than 15 minutes late, 12.1 points above the national departure figure of 76.1%. Flights arriving at GTF were on time 86.0% of the time, 10.0 points above the national arrival figure of 76.0%.
0.8% of scheduled departures were cancelled (national: 1.8%), and the average departure delay, counting early and on-time departures as zero, was 10.6 min.
SkyWest Airlines is the largest reporting carrier at GTF with 66% of departures. Among carriers with at least 120 departures, SkyWest Airlines had the highest on-time arrival share for its GTF departures (90.5%) and Allegiant Air the lowest (81.7%).
On-time departures are down 1.8 points on the previous 12 months (90.0%).
Of the delay minutes that carriers assigned to a BTS cause category for flights leaving GTF, air carrier 43%, extreme weather 20% and late-arriving aircraft 20%.
- On time 87.7%
- Arrived 15+ minutes late 11.3%
- Cancelled 0.8%
- Diverted 0.1%
As origin and as destination, against the nation
| Measure | Departures from GTF | Arrivals at GTF | All reported flights | GTF departures, previous 12 months |
|---|---|---|---|---|
| Departed on time (less than 15 min late) | 88.2% | 85.9% | 76.1% | 90.0% |
| Arrived on time | 87.7% | 86.0% | 76.0% | 87.3% |
| Cancelled | 0.8% | 0.6% | 1.8% | 0.1% |
| Diverted | 0.1% | 0.1% | 0.3% | 0.2% |
| Average departure delay (late minutes only) | 10.6 min | 9.3 min | 17.4 min | 8.9 min |
| Arrival delay minutes per 100 flights | 1,058 | 884 | 1,684 | 998 |
| Scheduled flights | 2,168 | 2,167 | 7,043,858 | 2,482 |
12 months to July 2026. The first column follows flights that left GTF; the second follows flights that landed there. Year on year, on-time departures moved −1.8 pts.
Airlines at GTF
| Reporting carrier | Flights | Share | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| OO SkyWest Airlines | 1,439 | 66% | 90.5% | -7.0 min | 0.8% |
| UA United Airlines | 527 | 24% | 82.5% | 3.7 min | 0.9% |
| G4 Allegiant Air | 202 | 9% | 81.7% | 5.4 min | 0.5% |
Departures from GTF by reporting carrier, ordered by flights; on time means the flight reached its destination less than 15 minutes late. Green is at or above the airport's overall share of 87.7%. Carriers fly different routes at different hours, so the rows are not a like-for-like test.
Busiest routes from GTF
| Route | Cities | Flights | On time | Avg arrival delay | Cancelled |
|---|---|---|---|---|---|
| GTF–SLC | Great Falls to Salt Lake City | 1,071 | 91.8% | -7.8 min | 0.7% |
| GTF–DEN | Great Falls to Denver | 728 | 84.8% | 0.3 min | 1.0% |
| GTF–LAS | Great Falls to Las Vegas | 111 | 88.3% | -8.2 min | 0.9% |
| GTF–SEA | Great Falls to Seattle | 106 | 79.2% | 1.6 min | 0.9% |
| GTF–AZA | Great Falls to Phoenix | 91 | 73.6% | 22.0 min | 0.0% |
| GTF–MSP | Great Falls to Minneapolis | 38 | 94.7% | -1.6 min | 0.0% |
| GTF–ORD | Great Falls to Chicago | 23 | 73.9% | -6.2 min | 0.0% |
Routes with at least 10 flights a month have their own page.
Month by month
By scheduled departure hour
Among hours with at least 43 departures, 5 am to 6 am had the highest on-time share (98.1% of 365 flights) and 4 pm to 5 pm the lowest (71.6% of 74).
Delay causes
Cancellations by reported reason (17 in the period): air carrier 24%, weather 41%, national aviation system 35%, security 0%.
Checkpoint volumes
TSA publishes daily checkpoint passenger counts for the country as a whole, not for GTF on its own. The national series through September 2026 is on the checkpoint volumes page.
Questions and answers
How often do flights leave GTF on time?
88.2% of the 2,168 scheduled domestic departures in the 12 months to July 2026 left less than 15 minutes late; the national figure was 76.1%. 0.8% were cancelled.
How often do flights arrive at GTF on time?
86.0% of 2,167 scheduled arrivals were on time by the BTS definition, against 76.0% nationally.
Which airline has the highest on-time share at GTF?
Counting departures from GTF and whether they reached their destination on time, SkyWest Airlines had the highest share (90.5% of 1,439 flights), then United Airlines (82.5%) and Allegiant Air (81.7%). Carriers fly different routes at different hours, so the figures are not a like-for-like test.
What causes delays at GTF?
For departures from GTF that reached their destination 15 or more minutes late, carriers attributed the delay minutes as follows: air carrier 43%, extreme weather 20%, late-arriving aircraft 20%, national aviation system 17%, security 0%.
What time of day has the highest on-time share at GTF?
Departures scheduled from 5 am to 6 am local time left on time 98.1% of the time, the highest of any hour with enough flights to compare; 4 pm to 5 pm was lowest at 71.6%.
Is it getting better?
On-time departures for the 12 months to July 2026 were 88.2%, down 1.8 points on the previous 12 months (90.0%). The monthly chart shows each of the last 36 months, and each month has its own page.
Does this page show today's delays at GTF?
No. BTS publishes on-time records about two months after the month ends, so this page is a monthly history through July 2026. For live conditions use the FAA airport status service or your airline.
Provenance
Source: Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987 to present), monthly files August 2023 to July 2026; airport name from the BTS airport lookup table. US government works in the public domain. Domestic scheduled flights by reporting carriers only: international flights, charters and smaller carriers are not in the source. Totals and averages only; no individual flight or aircraft is identified. See the methodology; report processing errors through corrections.