Carrier route record
ASBZN→SEA
Alaska Airlines · Bozeman to Seattle
- Flights
- 628
- 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 BZN to SEA lands a B, 7 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 628 flights, with a median arrival 10 minutes early.
Set against the rest of the country, Alaska's BZN to SEA record is 7 points better than the US average of 77.3%. That gap is worth roughly 66 fewer late arrivals for every thousand flights.
Key figures
On time
83.9%
Arrivals under 15 minutes late, of 620 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
1.11%
National rate is 1.89%
Whole route
84.1%
Every carrier on BZN to SEA, 1,565 flights
These figures cover 628 flights between September 2025 and August 2026. The median arrival is 10 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 BZN to SEA
Alaska flew 628 of the 1,565 flights on BZN to SEA, about 40% of it. Its 83.9% on time is about level with the route as a whole at 84.1%. 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 83.9%.
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% | 64 min | 0.21% | B+ |
| Alaska Airlines (this page) | 628 | 83.9% | 65 min | 1.11% | B |
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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 31 points, against half a point between the best and worst carrier.
- 5am–8am222 flights94.1%
- 8am–11am28 flights—
- 11am–2pm—
- 2pm–5pm299 flights78.3%
- 5pm–8pm41 flights82.5%
- 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 94.1% 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
December is the weak month at 72.9% on time, against 96.6% in January. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. July was the busiest month here, with 62 flights.
Across the week, Tuesday is the strongest day at 92.3% on time and Thursday the weakest at 79.8%, a spread of 13 points.
Arrival by arrival
How late Alaska on BZN to SEA runs when it is late
Alaska on BZN to SEA often beats the schedule: 237 of 620 completed flights, 38%, arrived 15 minutes or more early. The 100 late arrivals split 33 under half an hour, 31 between 30 and 60 minutes, and 36 an hour or more.
- 15+ min early237 flights38.2%
- Within 15 min283 flights45.6%
- 15–29 min late33 flights5.3%
- 30–59 min late31 flights5.0%
- 1–2 hours late24 flights3.9%
- 2+ hours late12 flights1.9%
Scale runs 0% to 100%.
Share of 620 completed flights by arrival against schedule.
25 of 95 late departures made up the time and arrived on time, 26% of them. 30 flights left on time and still arrived late.
The worst days
Worst days for Alaska on BZN to SEA
The latest arrival of the period was on 5 August 2026, 8 hours 44 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 |
|---|---|---|
| 5 August 2026 | 8 hours 44 minutes | Carrier |
| 24 December 2025 | 4 hours 20 minutes | Late-arriving aircraft |
| 14 March 2026 | 4 hours 17 minutes | Carrier |
| 22 February 2026 | 4 hours 13 minutes | Carrier |
| 5 December 2025 | 3 hours 18 minutes | Carrier |
Delay causes
Why Alaska runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,466 reported delay minutes.
- 39%Late-arriving aircraft
- 33%Carrier
- 25%National Airspace System
- 3%Extreme weather
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,466 reported delay minutes here, that single category outweighs weather by 11 to one. The split is drawn from 6,466 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 94.1% on time here.
Cancellations sit at 1.11% against a national 1.89%, which is ordinary. Diversions add another 0.16%.
Connections and stage length
What a delay here costs
5.8% 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 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.
The return leg is a different operation and performs like one: it runs 77.7% on time across 629 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. 628 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. 628 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 83.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 620 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 SEA84.2%
- 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.