Flight number record
DL 453
Delta Air Lines · Atlanta to Salt Lake City
- Route
- ATL → SLC
- Departs
- 21:15
- Flights
- 346
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 453, check with Delta Air Lines.
DL 453 lands a B+, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 346 flights, with a median arrival 3 minutes early.
Key figures
On time
76.0%
Arrivals under 15 minutes late, of 341 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
0.87%
National rate is 1.89%
1 hour+ late
10.3%
National rate is 8.3%
These figures cover 346 flights between September 2025 and August 2026. Beyond the headline rate, 10.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 453 flies
DL 453 flies ATL to SLC without a single fixed slot. Its most common scheduled departure was 21:15, used on 62 of 346 flights, with 21:35 (55 flights) and 21:40 (54 flights) next.
- Departs 21:1562 flights17.9%
- Departs 21:3555 flights15.9%
- Departs 21:4054 flights15.6%
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 21:15 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 453 runs 6 points better at 76.0%. 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 453 next to ATL to SLC
Every carrier on ATL to SLC combined arrived on time 82.7% of the time across 2,965 flights, so DL 453 is 7 points behind it. Delta flew 2,959 flights on the same city pair under all its flight numbers, including this one, and those ran 82.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 453thin sample | 346 | 76.0% | 80 min | 0.87% | B+ |
| All Delta Air Lines on ATL–SLC | 2,959 | 82.7% | 60 min | 0.44% | B+ |
| All carriers on ATL–SLC | 2,965 | 82.7% | 60 min | 0.44% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 453 quarter by quarter
Quarter by quarter DL 453 held fairly steady: 77.2% in Oct–Dec 2025, 77.4% in Jan–Mar 2026, 73.0% in Apr–Jun 2026 and 72.1% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202528 flights—
- Oct–Dec 202579 flights77.2%
- Jan–Mar 202686 flights77.4%
- Apr–Jun 202691 flights73.0%
- Jul–Sep 202662 flights72.1%
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, DL 453 did best on Wednesday at 86.0% on time and worst on Saturday at 71.7%. Each day rests on about 49 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 453 runs when it is late
DL 453 often beats the schedule: 87 of 341 completed flights, 26%, arrived 15 minutes or more early. The 82 late arrivals split 20 under half an hour, 27 between 30 and 60 minutes, and 35 an hour or more.
- 15+ min early87 flights25.5%
- Within 15 min172 flights50.4%
- 15–29 min late20 flights5.9%
- 30–59 min late27 flights7.9%
- 1–2 hours late22 flights6.5%
- 2+ hours late13 flights3.8%
Scale runs 0% to 100%.
Share of 341 completed flights by arrival against schedule.
21 of 92 late departures made up the time and arrived on time, 23% of them. 11 flights left on time and still arrived late.
The worst days
Worst days for DL 453
The latest arrival of the period was on 11 June 2026, 9 hours 54 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across June, March, December and November, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 June 2026 | 9 hours 54 minutes | Carrier |
| 9 March 2026 | 8 hours 38 minutes | Carrier |
| 7 December 2025 | 4 hours 24 minutes | Extreme weather |
| 8 November 2025 | 4 hours 14 minutes | National Airspace System |
| 16 March 2026 | 4 hours 14 minutes | Late-arriving aircraft |
Delay causes
Why DL 453 runs late
Carrier accounts for 58% of the 6,548 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Carrier
- 26%Late-arriving aircraft
- 11%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 58%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,821 of the 6,548 delay minutes reported here. The split is drawn from 6,548 delay minutes reported on DL 453.
Cancellations are rare at 0.87%, 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
10.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 1,590 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.
The same number turns up on one other city pair in the data, including JFK to DTW (11), but none flew often enough under DL 453 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to SLC only.
One caution: this is a thin sample. 346 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 453
For a booking, DL 453 is one of the weaker ways to fly ATL to SLC: 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.
Related
Where to go next
- ATL to SLC, every carrier and departure
- SLC to ATL, the return direction
- Delta Air Lines 663 on the same route87.9%
- Delta Air Lines 830 on the same route87.8%
- Delta Air Lines 387 on the same route90.3%
- Delta Air Lines 423 on the same route85.6%
- Delta Air Lines 653 on the same route79.4%
- Delta Air Lines 526 on the same route79.6%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Salt Lake City International (SLC) 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
- How often a connection fails at the major US hubs
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.