Flight number record

DL 1733

Delta Air Lines · Atlanta to Orlando

Route: ATL → MCO
Departs: 21:35
Flights: 343
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1733, check with Delta Air Lines.

DL 1733 draws a D. Roughly 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 343 flights, with a median arrival 3 minutes late.

The national on-time rate over the same period is 77.6%, so DL 1733 runs 14 points behind the country as a whole. Across a thousand flights that is about 144 extra late arrivals.

On time

63.2%

Arrivals under 15 minutes late, of 337 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

1.17%

National rate is 1.81%

1 hour+ late

12.2%

National rate is 8.1%

These figures cover 343 flights between July 2025 and June 2026. Beyond the headline rate, 12.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

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 343 flights, with 21:15 (52 flights) and 20:59 (48 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:35112 flights32.7%
Departs 21:1552 flights15.2%
Departs 20:5948 flights14.0%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 70.5%, and DL 1733 runs 7 points worse at 63.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 1733 next to ATL to MCO

Every carrier on ATL to MCO combined arrived on time 70.7% of the time across 8,211 flights, so DL 1733 is 8 points behind it. Delta flew 5,465 flights on the same city pair under all its flight numbers, including this one, and those ran 70.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 18 points.

DL 1733 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1733thin sample	343	63.2%	59 min	1.17%	D
All Delta Air Lines on ATL–MCO	5,465	70.7%	64 min	1.17%	C
All carriers on ATL–MCO	8,211	70.7%	73 min	1.36%	C
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1733 quarter by quarter

DL 1733 did not run the same all year. Its best quarter was Apr–Jun 2026 at 72.4% on time and its weakest Jul–Sep 2025 at 53.4%, a swing of 19 points on roughly 86 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 202588 flights53.4%
Oct–Dec 202587 flights63.1%
Jan–Mar 202680 flights64.1%
Apr–Jun 202688 flights72.4%

Scale runs 45% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1733 did best on Tuesday at 71.4% on time and worst on Sunday at 52.1%. Each day rests on about 49 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1733 runs late

One category carries most of the weight here. Carrier accounts for 59% of the 7,251 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
59%
Late-arriving aircraft
22%
National Airspace System
15%
Extreme weather
4%

The largest share of delay minutes, 59%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 4,260 of the 7,251 delay minutes reported here. The split is drawn from 7,251 delay minutes reported on DL 1733.

Cancellations sit at 1.17% against a national 1.81%, which is ordinary. Diversions add another 0.58%.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

Every one of the 343 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. 343 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. 12.2% 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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures