Flight number record

DL 1340

Delta Air Lines · Salt Lake City to Billings

Route: SLC → BIL
Departs: 21:05
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1340, check with Delta Air Lines.

DL 1340 lands a B+, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 8 minutes early.

On time

81.5%

Arrivals under 15 minutes late, of 363 completed flights

Avg delay

70 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

6.3%

National rate is 8.1%

These figures cover 365 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 1340 flies

DL 1340 flies SLC to BIL without a single fixed slot. Its most common scheduled departure was 21:05, used on 136 of 365 flights, with 21:30 (48 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:05136 flights37.3%
Departs 21:3048 flights13.2%

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 21:05 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 1340 runs 11 points better at 81.5%. 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 1340 next to SLC to BIL

Every carrier on SLC to BIL combined arrived on time 88.4% of the time across 1,074 flights, so DL 1340 is 7 points behind it. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 1340 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1340	365	81.5%	70 min	0.55%	B+
All Delta Air Lines on SLC–BIL	366	81.6%	70 min	0.55%	B+
All carriers on SLC–BIL	1,074	88.4%	67 min	0.56%	A+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1340 quarter by quarter

Quarter by quarter DL 1340 held fairly steady: 83.5% in Jul–Sep 2025, 82.6% in Oct–Dec 2025, 84.4% in Jan–Mar 2026 and 75.6% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights83.5%
Oct–Dec 202592 flights82.6%
Jan–Mar 202690 flights84.4%
Apr–Jun 202691 flights75.6%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1340 did best on Friday at 90.0% on time and worst on Sunday at 73.1%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1340 runs late

One category carries most of the weight here. Carrier accounts for 55% of the 4,715 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
55%
Late-arriving aircraft
30%
Extreme weather
13%
National Airspace System
3%

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 2.1 times the usual weather exposure. The split is drawn from 4,715 delay minutes reported on DL 1340.

Cancellations are rare at 0.55%, 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

6.3% 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 a little over an hour, which a normal layover absorbs.

Every one of the 365 flights under DL 1340 in the data flew SLC to BIL. 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. 365 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 1340

For a booking, DL 1340 is one of the weaker ways to fly SLC to BIL: 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