Route reliability record
BZN→SLC
Bozeman to Salt Lake City
- Flights
- 1,160
- Period
- September 2025 to August 2026
- Distance
- 347 mi
- Carriers
- 2
This route earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 1,160 BZN to SLC flights, of which Delta Air Lines flew 659 at 92.4% on time.
Best time to fly BZN to SLC: a 5am–8am departure, ideally on a Sunday. Flights in that window arrived on time 94.2% of the time and Sunday flights 92.3%, against 89.7% for the route overall.
Set against the rest of the country, this route's record is 12 points better than the US average of 77.3%. That gap is worth roughly 124 fewer late arrivals for every thousand flights.
Key figures
On time
89.7%
Arrivals under 15 minutes late, of 1,154 completed flights
Avg delay
91 min
Across delayed arrivals only, not all flights
Cancelled
0.52%
National rate is 1.89%
Best carrier
Delta
92.4% on time across 659 flights
These figures cover 1,160 flights between September 2025 and August 2026. The median arrival is 11 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
Which airline is most reliable on BZN to SLC
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 92.4% of the time; SkyWest Airlines manages 86.1%. Sample sizes sit next to every figure, because a two-point gap across 501 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 659 | 92.4% | 87 min | 0.30% | A+ |
| SkyWest Airlines | 501 | 86.1% | 94 min | 0.80% | A+ |
Delta leads SkyWest by 6 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Flights on BZN to SLC
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Bozeman to Salt Lake City
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. BZN → SLCBozeman to Salt Lake City | Delta Air Lines | 92.1% | 92.4% | 0.30% | 5am–8am, Sun | DL 491 05:15 |
| 2. BZN → SLCBozeman to Salt Lake City | SkyWest Airlines | 85.4% | 86.1% | 0.80% | 11am–2pm, Sun | OO 3676 18:30 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
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 1,160 flights.
- 5am–8am365 flights94.2%
- 8am–11am—
- 11am–2pm365 flights90.9%
- 2pm–5pm96 flights84.4%
- 5pm–8pm334 flights84.9%
- 8pm–5am—
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 94.2% of the time, against 84.4% for the afternoon window. That is 10 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 365 flights scheduled in it.
Explore
Filter BZN to SLC by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On BZN to SLC, the best departure window is 5am–8am at 94.2% on time and the worst is 2pm–5pm at 84.4%, a real gap of 9.8 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am94.2%
- 8–11am—
- 11am–2pm90.9%
- 2–5pm84.4%
- 5–8pm84.9%
- 8pm–5am—
best all US flightsScale 60% to 100%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 13 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
September is the best month on the calendar at 96.7% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. July was the busiest month here, with 123 flights.
Across the week, Sunday is the strongest day at 92.3% on time and Saturday the weakest at 85.1%, a spread of 7 points.
Delay causes
Why this route gets delayed
Carrier accounts for 48% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Carrier
- 25%Extreme weather
- 20%Late-arriving aircraft
- 7%National Airspace System
Extreme weather accounts for 25% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 4.1 times the usual weather exposure. The split is drawn from 10,792 reported delay minutes.
The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 5,222 of the 11,000 delay minutes reported here.
Cancellations are rare at 0.52%, 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 actually costs
Badly late arrivals are rare here: only 3.4% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 347 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg runs 88.5% on time across 1,160 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,160 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in SLC after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 96.7% on time and March 83.7%, a swing of 13 points. If the dates move at all, move them out of March before you think about anything else. 1,154 completed flights over 12 months sit behind that.
Common questions
BZN to SLC questions
How often is BZN to SLC delayed?
About one flight in ten arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 10.3% of the 1,160 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
Which airline is most reliable on BZN to SLC?
Delta Air Lines leads at 92.4% on time across 659 flights. SkyWest Airlines is at the other end on 86.1%, a gap of 6 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on BZN to SLC?
The 5am–8am departure window is the strongest at 94.2% on time. The 2pm–5pm window is the weakest at 84.4%, 10 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are March delays on BZN to SLC?
March is the weakest month at 83.7% on time, compared with 96.7% in September. Across the year that is 13 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- SLC to BZN — the return legseparate record
- Salt Lake City International (SLC) delay statistics
- Delta Air Lines on BZN to SLC92.4%
- SkyWest Airlines on BZN to SLC86.1%
- BZN to DEN, a related route77.5%
- DEN to SLC, a related route78.2%
- BZN to SEA, a related route84.1%
- Delta Air Lines on-time record92.4%
- SkyWest Airlines on-time record86.1%
- Flying to ski country: which routes into the mountains run on time
- The most punctual routes in the US, and the least
Direction matters. BZN to SLC and SLC to BZN are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.