Flight number record

DL 1723

Delta Air Lines · Salt Lake City to Missoula

Route: SLC → MSO
Departs: 22:45
Flights: 344
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1723, check with Delta Air Lines.

DL 1723 lands a B+, 6 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 an hour and a half on average. That rests on 344 flights, with a median arrival 9 minutes early.

Set against the rest of the country, DL 1723's record is 6 points better than the US average of 77.3%. That gap is worth roughly 64 fewer late arrivals for every thousand flights.

On time

83.7%

Arrivals under 15 minutes late, of 343 completed flights

Avg delay

91 min

Across delayed arrivals only, not all flights

Cancelled

0.29%

National rate is 1.89%

1 hour+ late

6.4%

National rate is 8.3%

These figures cover 344 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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Schedule

When DL 1723 flies

DL 1723 flies SLC to MSO without a single fixed slot. Its most common scheduled departure was 22:45, used on 154 of 344 flights, with 22:50 (62 flights) and 22:55 (49 flights) next.

Departs 22:45154 flights44.8%
Departs 22:5062 flights18.0%
Departs 22:5549 flights14.2%

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 22:45 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1723 runs 14 points better at 83.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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Against the route

DL 1723 next to SLC to MSO

Every carrier on SLC to MSO combined arrived on time 88.7% of the time across 1,059 flights, so DL 1723 is 5 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 3 points.

DL 1723 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1723thin sample	344	83.7%	91 min	0.29%	B+
All Delta Air Lines on SLC–MSO	467	84.9%	85 min	0.43%	B+
All carriers on SLC–MSO	1,059	88.7%	68 min	0.94%	A+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 1723 quarter by quarter

DL 1723 did not run the same all year. Its best quarter was Apr–Jun 2026 at 87.9% on time and its weakest Jan–Mar 2026 at 76.5%, a swing of 11 points on roughly 86 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.

Jul–Sep 202525 flights—
Oct–Dec 202580 flights87.5%
Jan–Mar 202686 flights76.5%
Apr–Jun 202691 flights87.9%
Jul–Sep 202662 flights87.1%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1723 did best on Saturday at 91.5% on time and worst on Wednesday at 67.3%. Each day rests on about 49 flights, so a gap of 24 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 1723 runs when it is late

DL 1723 often beats the schedule: 104 of 343 completed flights, 30%, arrived 15 minutes or more early. The 56 late arrivals split 19 under half an hour, 15 between 30 and 60 minutes, and 22 an hour or more.

15+ min early104 flights30.3%
Within 15 min183 flights53.4%
15–29 min late19 flights5.5%
30–59 min late15 flights4.4%
1–2 hours late15 flights4.4%
2+ hours late7 flights2.0%

Scale runs 0% to 100%.

Share of 343 completed flights by arrival against schedule.

10 of 59 late departures made up the time and arrived on time, 17% of them. 7 flights left on time and still arrived late.

The worst days

Worst days for DL 1723

The latest arrival of the period was on 14 January 2026, 10 hours 44 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).

The latest arrivals of DL 1723 in the period
Date	Arrived late by	Largest filed cause
14 January 2026	10 hours 44 minutes	Extreme weather
6 October 2025	9 hours 56 minutes	Carrier
23 March 2026	9 hours 5 minutes	Carrier
24 September 2025	7 hours 52 minutes	Carrier
26 June 2026	2 hours 42 minutes	Late-arriving aircraft

Delay causes

Why DL 1723 runs late

Carrier accounts for 70% of the 5,088 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
70%
Extreme weather
13%
Late-arriving aircraft
12%
National Airspace System
5%

Extreme weather accounts for 13% 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 quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.2 times the usual weather exposure. The split is drawn from 5,088 delay minutes reported on DL 1723.

Cancellations are rare at 0.29%, 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 routes

What a delay on this flight costs

6.4% 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 an hour and a half, which a normal layover absorbs.

Every one of the 344 flights under DL 1723 in the data flew SLC to MSO. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 344 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 1723

For a booking, DL 1723 is one of the weaker ways to fly SLC to MSO: 5 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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