Route Reliability
GTF → Seattle
GTF–SEA · 512 miles · GTF Airport to Seattle–Tacoma International Airport
- 80%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 0.5%
- Cancelled
- 364
- Flights in the data
Data through May 2026.
Alaska Airlines is the only airline in this data on this route, arriving on time 80% of the time across 364 flights. No comparison to make.
What the data says
Departure time hasn't mattered much.
On-time rates stay between 79% and 81% across the day.
Mondays have been rough.
GTF–SEA flights arrived on time 92% of the time on Wednesdays and just 73% on Mondays. That gap is worth planning around.
Trending in the right direction.
GTF–SEA flights arrived on time 81% of the time over the last three months in the data, compared with 74% in the three months before that.
Flights on this route
The breakdown
- Mon73%(52 flights)
- Tue83%(52 flights)
- Wed92%(52 flights)
- Thu77%(51 flights)
- Fri77%(51 flights)
- Sat82%(51 flights)
- Sun79%(53 flights)
- 3–6 PM81%(220 flights)
- 6–9 PM79%(142 flights)
Jun 73% → May 74% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 73% | 30 |
| July 2025 | 87% | 31 |
| August 2025 | 71% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 87% | 31 |
| November 2025 | 90% | 29 |
| December 2025 | 65% | 31 |
| January 2026 | 94% | 31 |
| February 2026 | 64% | 28 |
| March 2026 | 83% | 29 |
| April 2026 | 87% | 30 |
| May 2026 | 74% | 31 |
Keep nerding
Based on 364 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.