Flight number record
DL 664
Delta Air Lines · Atlanta to Orlando
- Route
- ATL → MCO
- Departs
- 10:25
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 664, check with Delta Air Lines.
DL 664 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 363 flights, with a median arrival 4 minutes early.
Set against the rest of the country, DL 664's record is 7 points better than the US average of 77.3%. That gap is worth roughly 67 fewer late arrivals for every thousand flights.
Key figures
On time
84.0%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
1.93%
National rate is 1.89%
1 hour+ late
3.7%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. The median arrival is 4 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 664 flies
DL 664 flies ATL to MCO without a single fixed slot. Its most common scheduled departure was 10:25, used on 205 of 363 flights, with 10:45 (55 flights) next.
- Departs 10:25205 flights56.5%
- Departs 10:4555 flights15.2%
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 10:25 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 664 runs level with that at 84.0%. 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 664 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 664 is 14 points ahead of 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 beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 664thin sample | 363 | 84.0% | 63 min | 1.93% | B |
| 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 664 quarter by quarter
Quarter by quarter DL 664 held fairly steady: 85.4% in Oct–Dec 2025, 80.5% in Jan–Mar 2026, 81.3% in Apr–Jun 2026 and 85.2% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202528 flights—
- Oct–Dec 202592 flights85.4%
- Jan–Mar 202690 flights80.5%
- Apr–Jun 202691 flights81.3%
- Jul–Sep 202662 flights85.2%
Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 664 ranged from 79.6% on Saturday to 90.4% on Wednesday. With about 52 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 664 runs when it is late
Most of the lateness is short. 30 of the 57 late arrivals were under half an hour behind, and 13 reached an hour or more.
- 15+ min early47 flights13.2%
- Within 15 min252 flights70.8%
- 15–29 min late30 flights8.4%
- 30–59 min late14 flights3.9%
- 1–2 hours late7 flights2.0%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
19 of 66 late departures made up the time and arrived on time, 29% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for DL 664
The latest arrival of the period was on 19 June 2026, 10 hours 12 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 June 2026 | 10 hours 12 minutes | Carrier |
| 2 May 2026 | 7 hours 3 minutes | National Airspace System |
| 5 July 2026 | 3 hours 53 minutes | Carrier |
| 10 June 2026 | 3 hours 14 minutes | Carrier |
| 30 July 2026 | 2 hours 54 minutes | National Airspace System |
Delay causes
Why DL 664 runs late
Carrier accounts for 60% of the 3,602 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Carrier
- 33%National Airspace System
- 6%Late-arriving aircraft
- 2%Extreme weather
33% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,180 minutes out of 3,602, against a national NAS share of 21%. The split is drawn from 3,602 delay minutes reported on DL 664.
Cancellations sit at 1.93% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
DL 664 is not only a ATL to MCO flight. It also flew MCO to ATL (363 flights, 79.2% 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. 363 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 ATLthin sample | 363 | 79.2% | 79 min | 1.93% | B |
What to do with this
Booking DL 664
For a booking, read DL 664 as 84.0% on time with 1.93% cancelled over 363 flights. Those are rates from the past twelve months, not a forecast for any particular day.
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 1150 on the same route61.3%
- 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
- 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.