Carrier route record
ASBZN→SEA
Alaska Airlines · Bozeman to Seattle
- Flights
- 622
- Period
- July 2025 to June 2026
- Share of route
- 40%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Alaska Airlines.
Alaska on BZN to SEA lands a B, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 622 flights, with a median arrival 9 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate Alaska on BZN to SEA from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
81.5%
Arrivals under 15 minutes late, of 612 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
1.45%
National rate is 1.81%
Whole route
84.4%
Every carrier on BZN to SEA, 1,571 flights
These figures cover 622 flights between July 2025 and June 2026. The median arrival is 9 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.
Carrier by carrier
Alaska against every carrier on BZN to SEA
Alaska flew 622 of the 1,571 flights on BZN to SEA, about 40% of it. Its 81.5% on time is 3 points worse than the route as a whole, which runs 84.4%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Delta at 100.0% to Alaska at 81.5%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 1 | 100.0% | — | 0.00% | A+ |
| SkyWest Airlines | 948 | 86.3% | 70 min | 0.21% | A+ |
| Alaska Airlines (this page) | 622 | 81.5% | 63 min | 1.45% | B |
Departure window
When Alaska runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 30 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am160 flights93.1%
- 8am–11am28 flights—
- 11am–2pm—
- 2pm–5pm299 flights79.7%
- 5pm–8pm97 flights72.3%
- 8pm–5am38 flights63.2%
Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 63.2% on time, against 93.1% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 2pm–5pm window is the busiest, with 299 flights scheduled in it.
Across the year
Alaska on BZN to SEA through the year
July is the worst month at 66.1% on time, 31 points below January, the best at 96.6%. 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 61 flights.
Across the week, Tuesday is the strongest day at 88.6% on time and Thursday the weakest at 75.5%. 13 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Alaska runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 7,169 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 45%Late-arriving aircraft
- 25%National Airspace System
- 23%Carrier
- 7%Extreme weather
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 7,169 reported delay minutes here, that single category outweighs weather by 6 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 7,169 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 93.1% on time here.
Cancellations sit at 1.45% against a national 1.81%, which is ordinary. Diversions add another 0.16%.
Connections and stage length
What a delay here costs
6.7% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg is a different operation and performs like one: it runs 75.9% on time across 623 flights, 6 points below 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. 622 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 BZN to SEA
Put together: treat all of this as provisional. 622 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 81.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 612 completed flights over 12 months sit behind that.
Related
Where to go next
- BZN to SEA, every carrier
- Alaska on SEA to BZN, the return leg
- SkyWest Airlines on BZN to SEA86.3%
- Alaska Airlines network-wide record
- Seattle-Tacoma International (SEA) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.