Flight number record
DL 1733
Delta Air Lines · Atlanta to Orlando
- Route
- ATL → MCO
- Departs
- 21:35
- Flights
- 339
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1733, check with Delta Air Lines.
DL 1733 draws a C. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 339 flights, with a median arrival 3 minutes late.
The national on-time rate over the same period is 77.3%, so DL 1733 runs 12 points behind the country as a whole. Across a thousand flights that is about 123 extra late arrivals.
Key figures
On time
65.0%
Arrivals under 15 minutes late, of 331 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.47%
National rate is 1.89%
1 hour+ late
13.3%
National rate is 8.3%
These figures cover 339 flights between September 2025 and August 2026. Beyond the headline rate, 13.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1733 flies
DL 1733 flies ATL to MCO without a single fixed slot. Its most common scheduled departure was 21:35, used on 112 of 339 flights, with 21:15 (54 flights) and 20:15 (39 flights) next.
- Departs 21:35112 flights33.0%
- Departs 21:1554 flights15.9%
- Departs 20:1539 flights11.5%
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 21:35 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1733 runs 5 points worse at 65.0%. 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 1733 next to ATL to MCO
Every carrier on ATL to MCO combined arrived on time 70.3% of the time across 8,267 flights, so DL 1733 is 5 points behind it. Delta flew 5,534 flights on the same city pair under all its flight numbers, including this one, and those ran 70.5% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1733thin sample | 339 | 65.0% | 58 min | 1.47% | C |
| All Delta Air Lines on ATL–MCO | 5,534 | 70.5% | 65 min | 1.32% | C |
| All carriers on ATL–MCO | 8,267 | 70.3% | 75 min | 1.58% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1733 quarter by quarter
DL 1733 did not run the same all year. Its best quarter was Jul–Sep 2025 at 76.7% on time and its weakest Jul–Sep 2026 at 50.0%, a swing of 27 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 202530 flights76.7%
- Oct–Dec 202587 flights63.1%
- Jan–Mar 202680 flights64.1%
- Apr–Jun 202688 flights72.4%
- Jul–Sep 202654 flights50.0%
Scale runs 40% to 80%.
By weekday, DL 1733 did best on Monday at 72.5% on time and worst on Sunday at 47.9%. Each day rests on about 48 flights, so a gap of 25 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1733 runs when it is late
The 116 late arrivals split 36 under half an hour, 36 between 30 and 60 minutes, and 44 an hour or more.
- 15+ min early28 flights8.5%
- Within 15 min187 flights56.5%
- 15–29 min late36 flights10.9%
- 30–59 min late36 flights10.9%
- 1–2 hours late33 flights10.0%
- 2+ hours late11 flights3.3%
Scale runs 0% to 100%.
Share of 331 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 116 departures that left 15 minutes late or more, only 11 made it up before arrival. 11 flights left on time and still arrived late.
The worst days
Worst days for DL 1733
The latest arrival of the period was on 11 July 2026, 3 hours 57 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across July, March, August and December, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 July 2026 | 3 hours 57 minutes | Late-arriving aircraft |
| 16 July 2026 | 2 hours 52 minutes | Carrier |
| 15 March 2026 | 2 hours 38 minutes | National Airspace System |
| 11 August 2026 | 2 hours 30 minutes | Late-arriving aircraft |
| 15 December 2025 | 2 hours 24 minutes | Carrier |
Delay causes
Why DL 1733 runs late
Carrier accounts for 59% of the 6,780 delay minutes carriers reported here, and the remaining four split what is left.
- 59%Carrier
- 27%Late-arriving aircraft
- 13%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 59%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,990 of the 6,780 delay minutes reported here. The split is drawn from 6,780 delay minutes reported on DL 1733.
Cancellations sit at 1.47% against a national 1.89%, which is ordinary. Diversions add another 0.88%.
Connections and routes
What a delay on this flight costs
13.3% 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.
Every one of the 339 flights under DL 1733 in the data flew ATL to MCO. 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. 339 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 1733
For a booking, DL 1733 is a flight to put a long connection behind. 13.3% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- ATL to MCO, every carrier and departure
- MCO to ATL, the return direction
- Delta Air Lines 1658 on the same route83.4%
- Delta Air Lines 1030 on the same route80.2%
- Delta Air Lines 1213 on the same route86.9%
- Delta Air Lines 1497 on the same route57.1%
- Delta Air Lines 1742 on the same route55.5%
- Delta Air Lines 664 on the same route84.0%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Orlando International (MCO) 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.