ON TIMEBOARD
Delta Air Lines / TUL → ATL

DL 1186 on time

Delta Air Lines 1186: Tulsa to Atlanta at 4:28 p.m.; Atlanta to Tulsa at 2:55 p.m. (past 12 months). Figures below the title are for TUL → ATL, its busiest leg

On time
82%
270 flights · likely 77–86%
Cancelled
1.8%
of scheduled flights
Typical arrival
−20 min
median vs schedule
When late
+113 min
average delay
Similar flights
82%
DL, same route & hour

About 1 in 6 DL 1186 flights from Tulsa arrived 15+ minutes late, diverted or cancelled over the past year (18%); 1.8% were cancelled. The typical flight landed 20 minutes early.

DL 1186: TUL → ATL

Scheduled to leave Tulsa at 4:28 p.m. local time. Over the past year it arrived on time 82% of the time (270 flights), in line with other DL flights on the route at that hour (82%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Sep 2025: 79% on time (29 flights)79SepOct 2025: 77% on time (31 flights)77OctNov 2025: 90% on time (30 flights)90NovDec 2025: 100% on time (19 flights)100DecJan 2026: 78% on time (27 flights)78JanFeb 2026: 89% on time (28 flights)89FebMar 2026: too few flights (7 flights)MarApr 2026: 88% on time (16 flights)88AprMay 2026: too few flights (5 flights)MayJun 2026: 76% on time (21 flights)76JunJul 2026: 67% on time (27 flights)67JulAug 2026: 83% on time (30 flights)83Aug

By day of week

DayFlightsOn time
Monday4290%
Tuesday4185%
Wednesday4193%
Thursday4083%
Friday4075%
Saturday2875%
Sunday3871%

Why it was late

Airline (crew, maintenance, ops) 48%Late inbound plane 43%Air traffic & airport (NAS) 7%Severe weather 2%

All flights TUL → ATL · Connecting off DL 1186? Check the risk

DL 1186: ATL → TUL

Scheduled to leave Atlanta at 2:55 p.m. local time. Over the past year it arrived on time 83% of the time (232 flights), in line with other DL flights on the route at that hour (84%). Last seen in the data Aug 31, 2026.

Month by month

40%70%100%Aug 2025: 90% on time (31 flights)90AugSep 2025: 76% on time (29 flights)76SepOct 2025: 77% on time (31 flights)77OctNov 2025: 97% on time (30 flights)97NovDec 2025: 95% on time (19 flights)95DecFeb 2026: 88% on time (17 flights)88FebMar 2026: too few flights (7 flights)MarApr 2026: 81% on time (16 flights)81AprMay 2026: too few flights (5 flights)MayJun 2026: 81% on time (21 flights)81JunJul 2026: 67% on time (27 flights)67JulAug 2026: 87% on time (30 flights)87Aug

By day of week

DayFlightsOn time
Monday3683%
Tuesday3577%
Wednesday3591%
Thursday3583%
Friday3586%
Saturday2383%
Sunday3376%

Why it was late

Airline (crew, maintenance, ops) 55%Late inbound plane 28%Air traffic & airport (NAS) 12%Severe weather 5%

All flights ATL → TUL · Connecting off DL 1186? Check the risk

Questions

How often is DL 1186 from TUL to ATL late?

Delta Air Lines 1186 from Tulsa, OK to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 18% of 270 scheduled flights between September 2025 and August 2026. 1.8% were cancelled.

How often is DL 1186 from ATL to TUL late?

Delta Air Lines 1186 from Atlanta, GA to Tulsa, OK arrived 15 or more minutes late, was diverted or was cancelled on 17% of 232 scheduled flights between September 2025 and August 2026. 0.4% were cancelled.

Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Delta Air Lines for today's flight. Method.