Carrier route record
ASSEA→BZN
Alaska Airlines · Seattle to Bozeman
- Flights
- 629
- Period
- September 2025 to August 2026
- Share of route
- 40%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on SEA to BZN lands a B+, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That rests on 629 flights, with a median arrival 3 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate Alaska on SEA to BZN from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
77.7%
Arrivals under 15 minutes late, of 624 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
0.79%
National rate is 1.89%
Whole route
81.6%
Every carrier on SEA to BZN, 1,566 flights
These figures cover 629 flights between September 2025 and August 2026. The median arrival is 3 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Alaska against every carrier on SEA to BZN
Alaska flew 629 of the 1,566 flights on SEA to BZN, about 40% of it. Its 77.7% on time is 4 points worse than the route as a whole, which runs 81.6%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 84.2% to Alaska at 77.7%.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 937 | 84.2% | 54 min | 0.21% | B+ |
| Alaska Airlines (this page) | 629 | 77.7% | 49 min | 0.79% | B+ |
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Alaska runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 629 flights.
- 5am–8am—
- 8am–11am—
- 11am–2pm299 flights79.0%
- 2pm–5pm79 flights77.2%
- 5pm–8pm—
- 8pm–5am251 flights76.4%
Scale runs 70% to 85%. Rows with fewer than 30 flights show a dash.
The 11am–2pm window is the strongest at 79.0% on time. The full set of windows spans 3 points.
Across the year
Alaska on SEA to BZN through the year
July is the worst month at 64.5% on time, 24 points below February, the best at 88.9%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. July was the busiest month here, with 62 flights.
Across the week, Sunday is the strongest day at 80.9% on time and Thursday the weakest at 69.1%, a spread of 12 points.
Arrival by arrival
How late Alaska on SEA to BZN runs when it is late
The 139 late arrivals split 57 under half an hour, 48 between 30 and 60 minutes, and 34 an hour or more.
- 15+ min early126 flights20.2%
- Within 15 min359 flights57.5%
- 15–29 min late57 flights9.1%
- 30–59 min late48 flights7.7%
- 1–2 hours late22 flights3.5%
- 2+ hours late12 flights1.9%
Scale runs 0% to 100%.
Share of 624 completed flights by arrival against schedule.
37 of 156 late departures made up the time and arrived on time, 24% of them. 20 flights left on time and still arrived late.
The worst days
Worst days for Alaska on SEA to BZN
The latest arrival of the period was on 24 December 2025, 4 hours 42 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 December 2025 | 4 hours 42 minutes | Carrier |
| 13 March 2026 | 3 hours 2 minutes | Late-arriving aircraft |
| 23 June 2026 | 2 hours 49 minutes | Carrier |
| 13 August 2026 | 2 hours 40 minutes | Carrier |
| 23 October 2025 | 2 hours 26 minutes | Carrier |
Delay causes
Why Alaska runs late on this route
Carrier accounts for 44% of the 6,872 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 38%Late-arriving aircraft
- 15%National Airspace System
- 2%Extreme weather
- 0%Security
38% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,872 reported delay minutes here, that single category outweighs weather by 16 to one. The split is drawn from 6,872 reported delay minutes.
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,038 of the 6,872 delay minutes reported here.
Cancellations are rare at 0.79%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here costs
5.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 50 minutes, which a normal layover absorbs.
The 543 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 83.9% on time across 628 flights, 6 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 6 points of difference.
One caution: this is a thin sample. 629 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Alaska on SEA to BZN
Put together: treat all of this as provisional. 629 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 77.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 624 completed flights over 12 months sit behind that.
Related
Where to go next
- SEA to BZN, every carrier
- Alaska on BZN to SEA, the return leg
- SkyWest Airlines on SEA to BZN84.2%
- Alaska Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Flying to ski country: which routes into the mountains run on time
- Why the first flight of the morning is statistically safest
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.