Flight number record
DL 2079
Delta Air Lines · Salt Lake City to Baltimore
- Route
- SLC → BWI
- Departs
- 23:40
- Flights
- 360
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2079, check with Delta Air Lines.
DL 2079 lands a B, about a point 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 35 minutes on average. That rests on 360 flights, with a median arrival 1 minute late.
Key figures
On time
78.3%
Arrivals under 15 minutes late, of 351 completed flights
Avg delay
35 min
Across delayed arrivals only, not all flights
Cancelled
1.94%
National rate is 1.89%
1 hour+ late
2.3%
National rate is 8.3%
These figures cover 360 flights between September 2025 and August 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.
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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 100 of 360 flights, with 17:40 (62 flights) and 23:59 (54 flights) next.
- Departs 23:40100 flights27.8%
- Departs 17:4062 flights17.2%
- Departs 23:5954 flights15.0%
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 23:40 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 2079 runs 8 points better at 78.3%. 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 2079 next to SLC to BWI
Every carrier on SLC to BWI combined arrived on time 81.2% of the time across 769 flights, so DL 2079 is 3 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2079thin sample | 360 | 78.3% | 35 min | 1.94% | B |
| All Delta Air Lines on SLC–BWIthin sample | 360 | 78.3% | 35 min | 1.94% | B |
| All carriers on SLC–BWI | 769 | 81.2% | 41 min | 1.56% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 100.0% on time and its weakest Apr–Jun 2026 at 60.0%, a swing of 40 points on roughly 72 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 flights100.0%
- Oct–Dec 202587 flights75.3%
- Jan–Mar 202690 flights83.7%
- Apr–Jun 202691 flights60.0%
- Jul–Sep 202662 flights91.7%
Scale runs 50% to 100%.
By weekday, DL 2079 did best on Saturday at 88.2% on time and worst on Friday at 64.7%. Each day rests on about 51 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2079 runs when it is late
Most of the lateness is short. 45 of the 76 late arrivals were under half an hour behind, and 8 reached an hour or more.
- 15+ min early60 flights17.1%
- Within 15 min215 flights61.3%
- 15–29 min late45 flights12.8%
- 30–59 min late23 flights6.6%
- 1–2 hours late6 flights1.7%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 351 completed flights by arrival against schedule.
A late pushback is often recovered here: of 56 departures that left 15 minutes late or more, 26 still arrived on time. In the other direction, 46 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at BWI.
The worst days
Worst days for DL 2079
The latest arrival of the period was on 15 May 2026, 2 hours 45 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 May 2026 | 2 hours 45 minutes | Carrier |
| 18 February 2026 | 2 hours 28 minutes | Late-arriving aircraft |
| 30 May 2026 | 1 hour 52 minutes | Carrier |
| 13 April 2026 | 1 hour 44 minutes | Carrier |
| 2 January 2026 | 1 hour 25 minutes | Carrier |
Delay causes
Why DL 2079 runs late
National Airspace System accounts for 46% of the 2,683 delay minutes carriers reported here, and the remaining four split what is left.
- 46%National Airspace System
- 39%Carrier
- 15%Late-arriving aircraft
The largest share of delay minutes, 39%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,049 of the 2,683 delay minutes reported here. The split is drawn from 2,683 delay minutes reported on DL 2079.
Cancellations sit at 1.94% against a national 1.89%, which is ordinary. Diversions add another 0.56%.
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 8.3% 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 78.3% on time with 1.94% cancelled over 360 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SLC to BWI, every carrier and departure
- BWI to SLC, the return direction
- Salt Lake City International (SLC) delay statistics
- Baltimore/Washington International Thurgood Marshall (BWI) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- The best time of day to fly, according to 7.05 million flight records
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 ; recomputed monthly. How this data is collected.