Flight number record

DL 511

Delta Air Lines · Cincinnati to Orlando

Route: CVG → MCO
Departs: 08:00
Flights: 362
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 511, check with Delta Air Lines.

DL 511 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 362 flights, with a median arrival 9 minutes early.

Set against the rest of the country, DL 511's record is 9 points better than the US average of 77.6%. That gap is worth roughly 87 fewer late arrivals for every thousand flights.

On time

86.3%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

1.10%

National rate is 1.81%

1 hour+ late

6.1%

National rate is 8.1%

These figures cover 362 flights between July 2025 and June 2026. The median arrival is 9 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.

Schedule

When DL 511 flies

DL 511 flies CVG to MCO without a single fixed slot. Its most common scheduled departure was 08:00, used on 137 of 362 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:00137 flights37.8%

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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 511 runs 2 points better at 86.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 511 next to CVG to MCO

Every carrier on CVG to MCO combined arrived on time 79.9% of the time across 1,783 flights, so DL 511 is 6 points ahead of it. Delta flew 722 flights on the same city pair under all its flight numbers, including this one, and those ran 79.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 5 points.

DL 511 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 511thin sample	362	86.3%	79 min	1.10%	A
All Delta Air Lines on CVG–MCO	722	79.3%	61 min	1.11%	B
All carriers on CVG–MCO	1,783	79.9%	72 min	1.12%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 511 quarter by quarter

Quarter by quarter DL 511 held fairly steady: 83.7% in Jul–Sep 2025, 85.6% in Oct–Dec 2025, 86.0% in Jan–Mar 2026 and 90.0% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights83.7%
Oct–Dec 202590 flights85.6%
Jan–Mar 202689 flights86.0%
Apr–Jun 202691 flights90.0%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 511 did best on Thursday at 92.2% on time and worst on Friday at 78.8%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 511 runs late

One category carries most of the weight here. Carrier accounts for 76% of the 3,862 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
76%
National Airspace System
15%
Late-arriving aircraft
7%
Extreme weather
2%

The largest share of delay minutes, 76%, 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 2,927 of the 3,862 delay minutes reported here. The split is drawn from 3,862 delay minutes reported on DL 511.

Cancellations sit at 1.10% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

6.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.

The 757 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

DL 511 is not only a CVG to MCO flight. It also flew MCO to CVG (362 flights, 78.7% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 362 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.

Other routes flown as DL 511
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
MCO to CVGthin sample	362	78.7%	79 min	1.38%	B

What to do with this

Booking DL 511

For a booking, DL 511 has one of the better records a US domestic flight can show: 86.3% on time and 1.10% cancelled. That is a base rate, not a promise about any single day.

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