Flight number record

DL 1340

Delta Air Lines · Salt Lake City to Billings

Route: SLC → BIL
Departs: 21:05
Flights: 365
Period: September 2025 to August 2026

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

DL 1340 lands a B+, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 365 flights, with a median arrival 9 minutes early.

On time

79.7%

Arrivals under 15 minutes late, of 364 completed flights

Avg delay

58 min

Across delayed arrivals only, not all flights

Cancelled

0.27%

National rate is 1.89%

1 hour+ late

7.1%

National rate is 8.3%

These figures cover 365 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 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 (52 flights) and 21:25 (49 flights) next.

Departs 21:05136 flights37.3%
Departs 21:3052 flights14.2%
Departs 21:2549 flights13.4%

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 21:05 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1340 runs 10 points better at 79.7%. 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 1340 next to SLC to BIL

Every carrier on SLC to BIL combined arrived on time 87.2% of the time across 1,074 flights, so DL 1340 is 8 points behind it. Across its whole network Delta Air Lines managed 81.1%, 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	79.7%	58 min	0.27%	B+
All Delta Air Lines on SLC–BIL	365	79.7%	58 min	0.27%	B+
All carriers on SLC–BIL	1,074	87.2%	64 min	0.47%	A+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 1340 quarter by quarter

DL 1340 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jul–Sep 2026 at 69.4%, a swing of 21 points on roughly 73 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 202530 flights90.0%
Oct–Dec 202592 flights82.6%
Jan–Mar 202690 flights84.4%
Apr–Jun 202691 flights75.6%
Jul–Sep 202662 flights69.4%

Scale runs 60% to 95%.

By weekday, DL 1340 did best on Saturday at 88.5% on time and worst on Sunday at 71.2%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 1340 runs when it is late

DL 1340 often beats the schedule: 129 of 364 completed flights, 35%, arrived 15 minutes or more early. The 74 late arrivals split 26 under half an hour, 22 between 30 and 60 minutes, and 26 an hour or more.

15+ min early129 flights35.4%
Within 15 min161 flights44.2%
15–29 min late26 flights7.1%
30–59 min late22 flights6.0%
1–2 hours late22 flights6.0%
2+ hours late4 flights1.1%

Scale runs 0% to 100%.

Share of 364 completed flights by arrival against schedule.

21 of 92 late departures made up the time and arrived on time, 23% of them. Only 3 left on time and still arrived late.

The worst days

Worst days for DL 1340

The latest arrival of the period was on 27 October 2025, 10 hours 12 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 a late-arriving aircraft.

The latest arrivals of DL 1340 in the period
Date	Arrived late by	Largest filed cause
27 October 2025	10 hours 12 minutes	Extreme weather
25 May 2026	3 hours 15 minutes	Carrier
7 June 2026	2 hours 21 minutes	Late-arriving aircraft
1 January 2026	2 hours 4 minutes	Late-arriving aircraft
25 January 2026	1 hour 58 minutes	Late-arriving aircraft

Delay causes

Why DL 1340 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,312 reported delay minutes.

Late-arriving aircraft
41%
Carrier
41%
Extreme weather
14%
National Airspace System
4%

Extreme weather accounts for 14% 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 2.3 times the usual weather exposure. The split is drawn from 4,312 delay minutes reported on DL 1340.

Cancellations are rare at 0.27%, 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

7.1% 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 about 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: 8 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