Flight number record

DL 2079

Delta Air Lines · Salt Lake City to Baltimore

Route: SLC → BWI
Departs: 23:40
Flights: 360
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2079, check with Delta Air Lines.

DL 2079 lands a B, level with the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about 35 minutes on average. That is a workable record, not a spotless one. That rests on 360 flights, with a median arrival 1 minute late.

On time

77.9%

Arrivals under 15 minutes late, of 353 completed flights

Avg delay

35 min

Across delayed arrivals only, not all flights

Cancelled

1.67%

National rate is 1.81%

1 hour+ late

2.3%

National rate is 8.1%

These figures cover 360 flights between July 2025 and June 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.

Schedule

When DL 2079 flies

DL 2079 flies SLC to BWI without a single fixed slot. Its most common scheduled departure was 23:40, used on 95 of 360 flights, with 17:40 (62 flights) and 23:59 (54 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 23:4095 flights26.4%
Departs 17:4062 flights17.2%
Departs 23:5954 flights15.0%

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 23:40 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 2079 runs 7 points better at 77.9%. 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 2079 next to SLC to BWI

Every carrier on SLC to BWI combined arrived on time 80.4% of the time across 770 flights, so DL 2079 is 3 points behind it. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 4 points.

DL 2079 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2079thin sample	360	77.9%	35 min	1.67%	B
All Delta Air Lines on SLC–BWIthin sample	360	77.9%	35 min	1.67%	B
All carriers on SLC–BWI	770	80.4%	46 min	1.43%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2079 quarter by quarter

DL 2079 did not run the same all year. Its best quarter was Jul–Sep 2025 at 92.4% on time and its weakest Apr–Jun 2026 at 60.0%, a swing of 32 points on roughly 90 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 202592 flights92.4%
Oct–Dec 202587 flights75.3%
Jan–Mar 202690 flights83.7%
Apr–Jun 202691 flights60.0%

Scale runs 50% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2079 did best on Saturday at 86.3% on time and worst on Friday at 64.7%. Each day rests on about 51 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2079 runs late

One category carries most of the weight here. National Airspace System accounts for 46% of the 2,723 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.

National Airspace System
46%
Carrier
42%
Late-arriving aircraft
13%

The largest share of delay minutes, 42%, 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 1,130 of the 2,723 delay minutes reported here. The split is drawn from 2,723 delay minutes reported on DL 2079.

Cancellations sit at 1.67% against a national 1.81%, which is ordinary. Diversions add another 0.28%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 2.3% land an hour or more behind schedule, against 8.1% 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.

At 1,865 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

Every one of the 360 flights under DL 2079 in the data flew SLC to BWI. 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. 360 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 2079

For a booking, read DL 2079 as 77.9% on time with 1.67% cancelled over 360 flights. Those are rates from the past twelve months, not a forecast for any particular 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures