Flight number record
DL 511
Delta Air Lines · Cincinnati to Orlando
- Route
- CVG → MCO
- Departs
- 08:00
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 511, check with Delta Air Lines.
DL 511 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. 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 10 points better than the US average of 77.3%. That gap is worth roughly 98 fewer late arrivals for every thousand flights.
Key figures
On time
87.1%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
1.66%
National rate is 1.89%
1 hour+ late
5.6%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 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.
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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 131 of 362 flights.
- Departs 08:00131 flights36.2%
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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 511 runs 3 points better at 87.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
DL 511 next to CVG to MCO
Every carrier on CVG to MCO combined arrived on time 79.6% of the time across 1,791 flights, so DL 511 is 8 points ahead of it. Delta flew 721 flights on the same city pair under all its flight numbers, including this one, and those ran 80.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 511thin sample | 362 | 87.1% | 78 min | 1.66% | A |
| All Delta Air Lines on CVG–MCO | 721 | 80.7% | 60 min | 1.53% | B |
| All carriers on CVG–MCO | 1,791 | 79.6% | 72 min | 1.40% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 511 quarter by quarter
DL 511 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 83.3%, a swing of 10 points on roughly 72 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 flights93.3%
- Oct–Dec 202590 flights85.6%
- Jan–Mar 202689 flights86.0%
- Apr–Jun 202691 flights90.0%
- Jul–Sep 202662 flights83.3%
Scale runs 75% to 100%.
By weekday, DL 511 did best on Wednesday at 94.1% on time and worst on Monday at 80.8%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 511 runs when it is late
The 46 late arrivals split 10 under half an hour, 16 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early86 flights24.2%
- Within 15 min224 flights62.9%
- 15–29 min late10 flights2.8%
- 30–59 min late16 flights4.5%
- 1–2 hours late10 flights2.8%
- 2+ hours late10 flights2.8%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
7 of 47 late departures made up the time and arrived on time, 15% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for DL 511
The latest arrival of the period was on 23 March 2026, 5 hours 25 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in March 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 23 March 2026 | 5 hours 25 minutes | Carrier |
| 28 June 2026 | 4 hours 39 minutes | Late-arriving aircraft |
| 8 March 2026 | 3 hours | Carrier |
| 31 October 2025 | 2 hours 50 minutes | Carrier |
| 16 March 2026 | 2 hours 15 minutes | National Airspace System |
Delay causes
Why DL 511 runs late
Carrier accounts for 76% of the 3,570 delay minutes carriers reported here, and the remaining four split what is left.
- 76%Carrier
- 14%National Airspace System
- 8%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 76%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,710 of the 3,570 delay minutes reported here. The split is drawn from 3,570 delay minutes reported on DL 511.
Cancellations sit at 1.66% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
5.6% of arrivals land an hour or more late, close to the national 8.3%, so 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.
DL 511 is not only a CVG to MCO flight. It also flew MCO to CVG (362 flights, 78.9% 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| MCO to CVGthin sample | 362 | 78.9% | 80 min | 1.38% | B |
What to do with this
Booking DL 511
For a booking, read DL 511 as 87.1% on time with 1.66% cancelled over 362 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- CVG to MCO, every carrier and departure
- MCO to CVG, the return direction
- Delta Air Lines 2824 on the same route74.3%
- Cincinnati/Northern Kentucky International (CVG) 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
- Worst months to fly in the US, ranked by the data
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.