Flight number record
DL 2497
Delta Air Lines · San Antonio to Detroit
- Route
- SAT → DTW
- Departs
- 05:15
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2497, check with Delta Air Lines.
DL 2497 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 18 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 365 flights, with a median arrival 12 minutes early.
Set against the rest of the country, DL 2497's record is 18 points better than the US average of 77.3%. That gap is worth roughly 180 fewer late arrivals for every thousand flights.
Key figures
On time
95.3%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
97 min
Across delayed arrivals only, not all flights
Cancelled
1.10%
National rate is 1.89%
1 hour+ late
1.9%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 12 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 2497 flies
DL 2497 flies SAT to DTW without a single fixed slot. Its most common scheduled departure was 05:15, used on 100 of 365 flights, with 05:10 (96 flights) and 05:20 (64 flights) next.
- Departs 05:15100 flights27.4%
- Departs 05:1096 flights26.3%
- Departs 05:2064 flights17.5%
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 05:15 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2497 runs 6 points better at 95.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 2497 next to SAT to DTW
Every carrier on SAT to DTW combined arrived on time 90.7% of the time across 934 flights, so DL 2497 is 5 points ahead of it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2497 | 365 | 95.3% | 97 min | 1.10% | A |
| All Delta Air Lines on SAT–DTW | 934 | 90.7% | 67 min | 0.75% | A+ |
| All carriers on SAT–DTW | 934 | 90.7% | 67 min | 0.75% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2497 quarter by quarter
Quarter by quarter DL 2497 held fairly steady: 93.3% in Jul–Sep 2025, 97.8% in Oct–Dec 2025, 90.9% in Jan–Mar 2026, 94.4% in Apr–Jun 2026 and 100.0% in Jul–Sep 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 202530 flights93.3%
- Oct–Dec 202592 flights97.8%
- Jan–Mar 202690 flights90.9%
- Apr–Jun 202691 flights94.4%
- Jul–Sep 202662 flights100.0%
Scale runs 80% to 100%.
By weekday, DL 2497 ranged from 88.5% on Thursday to 100.0% on Wednesday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 2497 runs when it is late
DL 2497 often beats the schedule: 146 of 361 completed flights, 40%, arrived 15 minutes or more early. The 17 late arrivals split 6 under half an hour, 4 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early146 flights40.4%
- Within 15 min198 flights54.8%
- 15–29 min late6 flights1.7%
- 30–59 min late4 flights1.1%
- 1–2 hours late2 flights0.6%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
Only 16 of 361 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for DL 2497
The latest arrival of the period was on 8 March 2026, 5 hours 35 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 March 2026 | 5 hours 35 minutes | Carrier |
| 30 April 2026 | 5 hours 30 minutes | Carrier |
| 27 January 2026 | 3 hours 56 minutes | Carrier |
| 7 October 2025 | 2 hours 29 minutes | Carrier |
| 10 April 2026 | 2 hours 19 minutes | Carrier |
Delay causes
Why DL 2497 runs late
Carrier accounts for 86% of the 1,648 delay minutes carriers reported here, and the remaining four split what is left.
- 86%Carrier
- 13%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 86%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,414 of the 1,648 delay minutes reported here. The split is drawn from 1,648 delay minutes reported on DL 2497.
Cancellations sit at 1.10% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 1.9% 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.
The 1,214 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 365 flights under DL 2497 in the data flew SAT to DTW. 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 2497
For a booking, DL 2497 has one of the better records a US domestic flight can show: 95.3% on time and 1.10% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- SAT to DTW, every carrier and departure
- DTW to SAT, the return direction
- San Antonio International (SAT) delay statistics
- Detroit Metropolitan Wayne County (DTW) 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
- Worst months to fly in the US, ranked by the data
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.