Flight number record

DL 491

Delta Air Lines · Bozeman to Salt Lake City

Route: BZN → SLC
Departs: 05:15
Flights: 255
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 491, check with Delta Air Lines.

DL 491 earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 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 255 flights, with a median arrival 13 minutes early.

Set against the rest of the country, DL 491's record is 17 points better than the US average of 77.3%. That gap is worth roughly 168 fewer late arrivals for every thousand flights.

On time

94.1%

Arrivals under 15 minutes late, of 255 completed flights

Avg delay

97 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.89%

1 hour+ late

1.6%

National rate is 8.3%

These figures cover 255 flights between September 2025 and August 2026. The median arrival is 13 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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Schedule

When DL 491 flies

DL 491 flies BZN to SLC without a single fixed slot. Its most common scheduled departure was 05:15, used on 88 of 255 flights, with 05:20 (52 flights) and 05:30 (48 flights) next.

Departs 05:1588 flights34.5%
Departs 05:2052 flights20.4%
Departs 05:3048 flights18.8%

Scale runs 0% to 100%.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 05:15 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 491 runs 5 points better at 94.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

DL 491 next to BZN to SLC

Every carrier on BZN to SLC combined arrived on time 89.7% of the time across 1,160 flights, so DL 491 is 4 points ahead of it. Delta flew 659 flights on the same city pair under all its flight numbers, including this one, and those ran 92.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 13 points.

DL 491 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 491thin sample	255	94.1%	97 min	0.00%	A+
All Delta Air Lines on BZN–SLC	659	92.4%	87 min	0.30%	A+
All carriers on BZN–SLC	1,160	89.7%	91 min	0.52%	A+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 491 quarter by quarter

Quarter by quarter DL 491 held fairly steady: 95.6% in Jan–Mar 2026, 93.4% in Apr–Jun 2026 and 96.8% in Jul–Sep 2026. A spread of 3 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Oct–Dec 202512 flights—
Jan–Mar 202690 flights95.6%
Apr–Jun 202691 flights93.4%
Jul–Sep 202662 flights96.8%

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 491 ranged from 88.9% on Friday to 97.2% on Tuesday. With about 36 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late DL 491 runs when it is late

DL 491 often beats the schedule: 104 of 255 completed flights, 41%, arrived 15 minutes or more early. Most of the lateness is short. 9 of the 15 late arrivals were under half an hour behind, and 4 reached an hour or more.

15+ min early104 flights40.8%
Within 15 min136 flights53.3%
15–29 min late9 flights3.5%
30–59 min late2 flights0.8%
1–2 hours late2 flights0.8%
2+ hours late2 flights0.8%

Scale runs 0% to 100%.

Share of 255 completed flights by arrival against schedule.

Only 11 of 255 completed flights left 15 minutes late or more, too few to say how often the time is made up.

The worst days

Worst days for DL 491

The latest arrival of the period was on 16 April 2026, 10 hours 8 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in April 2026.

The latest arrivals of DL 491 in the period
Date	Arrived late by	Largest filed cause
16 April 2026	10 hours 8 minutes	Late-arriving aircraft
14 July 2026	6 hours 7 minutes	Carrier
19 April 2026	1 hour 54 minutes	Carrier
28 December 2025	1 hour 18 minutes	National Airspace System
20 April 2026	50 minutes	Carrier

Delay causes

Why DL 491 runs late

Carrier accounts for 48% of the 1,450 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
48%
Late-arriving aircraft
41%
National Airspace System
11%

41% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,450 reported delay minutes here, that single category outweighs weather by 41 to one. The split is drawn from 1,450 delay minutes reported on DL 491.

Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 1.6% 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.

The same number turns up on two other city pairs in the data, including JFK to SEA (108) and ATL to MIA (1), but none flew often enough under DL 491 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BZN to SLC only.

One caution: this is a thin sample. 255 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 DL 491

For a booking, DL 491 has one of the better records a US domestic flight can show: 94.1% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.

Where to go next

A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures