Flight number record
DL 1186
Delta Air Lines · Tulsa to Atlanta
- Route
- TUL → ATL
- Departs
- 16:28
- Flights
- 270
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1186, check with Delta Air Lines.
DL 1186 lands a B, 7 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That rests on 270 flights, with a median arrival 20 minutes early.
Set against the rest of the country, DL 1186's record is 7 points better than the US average of 77.3%. That gap is worth roughly 65 fewer late arrivals for every thousand flights.
Key figures
On time
83.8%
Arrivals under 15 minutes late, of 265 completed flights
Avg delay
113 min
Across delayed arrivals only, not all flights
Cancelled
1.85%
National rate is 1.89%
1 hour+ late
9.4%
National rate is 8.3%
These figures cover 270 flights between September 2025 and August 2026. Beyond the headline rate, 9.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1186 flies
DL 1186 flies TUL to ATL without a single fixed slot. Its most common scheduled departure was 16:28, used on 51 of 270 flights, with 17:16 (32 flights) next.
- Departs 16:2851 flights18.9%
- Departs 17:1632 flights11.9%
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 16:28 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 1186 runs 12 points better at 83.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 1186 next to TUL to ATL
Every carrier on TUL to ATL combined arrived on time 87.7% of the time across 1,573 flights, so DL 1186 is 4 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1186thin sample | 270 | 83.8% | 113 min | 1.85% | B |
| All Delta Air Lines on TUL–ATL | 1,573 | 87.7% | 122 min | 2.42% | A |
| All carriers on TUL–ATL | 1,573 | 87.7% | 122 min | 2.42% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1186 quarter by quarter
DL 1186 did not run the same all year. Its best quarter was Oct–Dec 2025 at 88.6% on time and its weakest Jul–Sep 2026 at 75.4%, a swing of 13 points on roughly 68 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 202529 flights—
- Oct–Dec 202580 flights88.6%
- Jan–Mar 202662 flights86.4%
- Apr–Jun 202642 flights85.4%
- Jul–Sep 202657 flights75.4%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1186 did best on Monday at 92.7% on time and worst on Sunday at 71.1%. Each day rests on about 39 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1186 runs when it is late
DL 1186 often beats the schedule: 158 of 265 completed flights, 60%, arrived 15 minutes or more early. When DL 1186 is late it tends to be very late: 25 of its 43 late arrivals were an hour or more behind, and 7 were two hours or more.
- 15+ min early158 flights59.6%
- Within 15 min64 flights24.2%
- 15–29 min late10 flights3.8%
- 30–59 min late8 flights3.0%
- 1–2 hours late18 flights6.8%
- 2+ hours late7 flights2.6%
Scale runs 0% to 100%.
Share of 265 completed flights by arrival against schedule.
13 of 54 late departures made up the time and arrived on time, 24% of them. Only 2 left on time and still arrived late.
The worst days
Worst days for DL 1186
The latest arrival of the period was on 7 March 2026, 17 hours 59 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 March 2026 | 17 hours 59 minutes | Carrier |
| 7 June 2026 | 15 hours 18 minutes | Carrier |
| 14 June 2026 | 2 hours 48 minutes | Late-arriving aircraft |
| 24 July 2026 | 2 hours 15 minutes | Late-arriving aircraft |
| 18 February 2026 | 2 hours 11 minutes | Late-arriving aircraft |
Delay causes
Why DL 1186 runs late
Carrier accounts for 48% of the 4,849 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Carrier
- 43%Late-arriving aircraft
- 7%National Airspace System
- 2%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,849 reported delay minutes here, that single category outweighs weather by 19 to one. The split is drawn from 4,849 delay minutes reported on DL 1186.
Cancellations sit at 1.85% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
9.4% 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.
The 674 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.
The same number turns up on four other city pairs in the data, including ATL to TUL (232), MSP to RSW (36) and ATL to PHL (31), but none flew often enough under DL 1186 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to TUL to ATL only.
One caution: this is a thin sample. 270 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 1186
For a booking, read DL 1186 as 83.8% on time with 1.85% cancelled over 270 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- TUL to ATL, every carrier and departure
- ATL to TUL, the return direction
- Delta Air Lines 1259 on the same route93.1%
- Delta Air Lines 2754 on the same route93.2%
- Delta Air Lines 2620 on the same route83.4%
- 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
- Why the first flight of the morning is statistically safest
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.