Flight number record

DL 1723

Delta Air Lines · Salt Lake City to Missoula

Route: SLC → MSO
Departs: 22:45
Flights: 344
Period: July 2025 to June 2026

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

DL 1723 lands a B+, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 344 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 1723's record is 5 points better than the US average of 77.6%. That gap is worth roughly 46 fewer late arrivals for every thousand flights.

On time

82.2%

Arrivals under 15 minutes late, of 343 completed flights

Avg delay

105 min

Across delayed arrivals only, not all flights

Cancelled

0.29%

National rate is 1.81%

1 hour+ late

7.0%

National rate is 8.1%

These figures cover 344 flights between July 2025 and June 2026. The median arrival is 8 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.

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 140 of 344 flights, with 22:50 (62 flights) and 22:55 (52 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 22:45140 flights40.7%
Departs 22:5062 flights18.0%
Departs 22:5552 flights15.1%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 70.5%, and DL 1723 runs 12 points better at 82.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

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 7 points behind it. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 1723 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1723thin sample	344	82.2%	105 min	0.29%	B+
All Delta Air Lines on SLC–MSO	467	83.9%	97 min	0.43%	B+
All carriers on SLC–MSO	1,059	88.7%	76 min	0.94%	A+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 202587 flights77.0%
Oct–Dec 202580 flights87.5%
Jan–Mar 202686 flights76.5%
Apr–Jun 202691 flights87.9%

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

By weekday, DL 1723 did best on Friday at 91.8% on time and worst on Wednesday at 63.3%. Each day rests on about 49 flights, so a gap of 29 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1723 runs late

One category carries most of the weight here. Carrier accounts for 71% of the 6,425 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
71%
Late-arriving aircraft
12%
Extreme weather
10%
National Airspace System
6%

The largest share of delay minutes, 71%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 4,570 of the 6,425 delay minutes reported here. The split is drawn from 6,425 delay minutes reported on DL 1723.

Cancellations are rare at 0.29%, below the national 1.81% 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

7.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, 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: 7 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures