Flight number record
DL 1158
Delta Air Lines · Oklahoma City to Atlanta
- Route
- OKC → ATL
- Departs
- 08:00
- Flights
- 357
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1158, check with Delta Air Lines.
DL 1158 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 2.8 hours. That rests on 357 flights, with a median arrival 17 minutes early.
Set against the rest of the country, DL 1158's record is 14 points better than the US average of 77.3%. That gap is worth roughly 138 fewer late arrivals for every thousand flights.
Key figures
On time
91.1%
Arrivals under 15 minutes late, of 349 completed flights
Avg delay
168 min
Across delayed arrivals only, not all flights
Cancelled
2.24%
National rate is 1.89%
1 hour+ late
4.0%
National rate is 8.3%
These figures cover 357 flights between September 2025 and August 2026. The median arrival is 17 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 1158 flies
DL 1158 flies OKC to ATL without a single fixed slot. Its most common scheduled departure was 08:00, used on 86 of 357 flights, with 06:50 (76 flights) and 07:00 (40 flights) next.
- Departs 08:0086 flights24.1%
- Departs 06:5076 flights21.3%
- Departs 07:0040 flights11.2%
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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1158 runs 7 points better at 91.1%. 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 1158 next to OKC to ATL
Every carrier on OKC to ATL combined arrived on time 86.5% of the time across 1,813 flights, so DL 1158 is 5 points ahead of it. Delta flew 1,723 flights on the same city pair under all its flight numbers, including this one, and those ran 88.3% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1158thin sample | 357 | 91.1% | 168 min | 2.24% | A |
| All Delta Air Lines on OKC–ATL | 1,723 | 88.3% | 96 min | 2.61% | A |
| All carriers on OKC–ATL | 1,813 | 86.5% | 97 min | 2.65% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1158 quarter by quarter
DL 1158 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Jul–Sep 2026 at 79.6%, a swing of 20 points on roughly 71 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 202592 flights94.4%
- Jan–Mar 202690 flights91.9%
- Apr–Jun 202691 flights91.1%
- Jul–Sep 202654 flights79.6%
Scale runs 70% to 100%.
By weekday, DL 1158 ranged from 85.7% on Saturday to 94.2% on Friday. With about 51 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1158 runs when it is late
DL 1158 often beats the schedule: 208 of 349 completed flights, 60%, arrived 15 minutes or more early. The 31 late arrivals split 10 under half an hour, 7 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early208 flights59.6%
- Within 15 min110 flights31.5%
- 15–29 min late10 flights2.9%
- 30–59 min late7 flights2.0%
- 1–2 hours late3 flights0.9%
- 2+ hours late11 flights3.2%
Scale runs 0% to 100%.
Share of 349 completed flights by arrival against schedule.
9 of 33 late departures made up the time and arrived on time, 27% of them. 7 flights left on time and still arrived late.
The worst days
Worst days for DL 1158
The latest arrival of the period was on 28 April 2026, 17 hours 28 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 |
|---|---|---|
| 28 April 2026 | 17 hours 28 minutes | Carrier |
| 19 June 2026 | 14 hours 40 minutes | Carrier |
| 22 August 2026 | 10 hours 58 minutes | Carrier |
| 19 July 2026 | 8 hours 51 minutes | Carrier |
| 23 August 2026 | 5 hours 17 minutes | Carrier |
Delay causes
Why DL 1158 runs late
Carrier accounts for 85% of the 5,214 delay minutes carriers reported here, and the remaining four split what is left.
- 85%Carrier
- 12%National Airspace System
- 3%Extreme weather
The largest share of delay minutes, 85%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,412 of the 5,214 delay minutes reported here. The split is drawn from 5,214 delay minutes reported on DL 1158.
Cancellations sit at 2.24% 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 4.0% 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 761 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 357 flights under DL 1158 in the data flew OKC to ATL. 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. 357 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 1158
For a booking, read DL 1158 as 91.1% on time with 2.24% cancelled over 357 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- OKC to ATL, every carrier and departure
- ATL to OKC, the return direction
- Delta Air Lines 1184 on the same route92.4%
- Delta Air Lines 2490 on the same route89.8%
- Delta Air Lines 2862 on the same route81.9%
- Delta Air Lines 2020 on the same route84.1%
- Hartsfield-Jackson Atlanta International (ATL) 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.