Carrier route record
DLSLC→BZN
Delta Air Lines · Salt Lake City to Bozeman
- Flights
- 659
- Period
- September 2025 to August 2026
- Share of route
- 57%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on SLC to BZN 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 659 flights, with a median arrival 9 minutes early.
Set against the rest of the country, Delta's SLC to BZN record is 13 points better than the US average of 77.3%. That gap is worth roughly 128 fewer late arrivals for every thousand flights.
Key figures
On time
90.1%
Arrivals under 15 minutes late, of 654 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.30%
National rate is 1.89%
Whole route
88.5%
Every carrier on SLC to BZN, 1,160 flights
These figures cover 659 flights between September 2025 and August 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.
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Carrier by carrier
Delta against every carrier on SLC to BZN
Delta flew 659 of the 1,160 flights on SLC to BZN, most of the route. Its 90.1% on time is 2 points better than the route as a whole, which runs 88.5%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from Delta at 90.1% to SkyWest at 86.4%.
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 Lines (this page) | 659 | 90.1% | 57 min | 0.30% | A+ |
| SkyWest Airlines | 501 | 86.4% | 47 min | 0.80% | A+ |
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Departure window
When Delta 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 659 flights.
- 5am–8am—
- 8am–11am291 flights91.3%
- 11am–2pm3 flights—
- 2pm–5pm—
- 5pm–8pm1 flights—
- 8pm–5am364 flights89.0%
Scale runs 80% to 95%. Rows with fewer than 30 flights show a dash.
The 8am–11am window is the strongest at 91.3% on time. The full set of windows spans 2 points.
Across the year
Delta on SLC to BZN through the year
January is the weak month at 80.0% on time, against 95.2% in July. 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. May was the busiest month here, with 62 flights.
Across the week, Wednesday is the strongest day at 93.5% on time and Saturday the weakest at 86.0%, a spread of 8 points.
Arrival by arrival
How late Delta on SLC to BZN runs when it is late
Delta on SLC to BZN often beats the schedule: 193 of 654 completed flights, 30%, arrived 15 minutes or more early. The 65 late arrivals split 29 under half an hour, 18 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early193 flights29.5%
- Within 15 min396 flights60.6%
- 15–29 min late29 flights4.4%
- 30–59 min late18 flights2.8%
- 1–2 hours late9 flights1.4%
- 2+ hours late9 flights1.4%
Scale runs 0% to 100%.
Share of 654 completed flights by arrival against schedule.
22 of 81 late departures made up the time and arrived on time, 27% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for Delta on SLC to BZN
The latest arrival of the period was on 22 April 2026, 5 hours 13 minutes behind schedule; most of its delay minutes were filed as extreme weather. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 22 April 2026 | 5 hours 13 minutes | Extreme weather |
| 24 November 2025 | 4 hours 12 minutes | Carrier |
| 29 September 2025 | 3 hours 25 minutes | Carrier |
| 23 June 2026 | 2 hours 30 minutes | Carrier |
| 12 May 2026 | 2 hours 21 minutes | Carrier |
Delay causes
Why Delta runs late on this route
Carrier accounts for 60% of the 3,679 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Carrier
- 19%Late-arriving aircraft
- 15%Extreme weather
- 6%National Airspace System
Extreme weather accounts for 15% 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 2.5 times the usual weather exposure. The split is drawn from 3,679 reported delay minutes.
The largest share of delay minutes, 60%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,222 of the 3,679 delay minutes reported here.
Cancellations are rare at 0.30%, 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
Badly late arrivals are rare here: only 2.8% 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 8am–11am window matters as much as it does.
The return leg runs 92.4% on time across 659 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 659 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 Delta on SLC to BZN
Put together: treat all of this as provisional. 659 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 90.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 654 completed flights over 12 months sit behind that.
Related
Where to go next
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.