Flight number record
DL 1378
Delta Air Lines · Detroit to Fort Lauderdale
- Route
- DTW → FLL
- Departs
- 10:05
- Flights
- 285
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1378, check with Delta Air Lines.
DL 1378 lands a B, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 285 flights, with a median arrival 4 minutes early.
Key figures
On time
77.3%
Arrivals under 15 minutes late, of 277 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
2.46%
National rate is 1.89%
1 hour+ late
8.3%
National rate is 8.3%
These figures cover 285 flights between September 2025 and August 2026. Beyond the headline rate, 8.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1378 flies
DL 1378 flies DTW to FLL without a single fixed slot. Its most common scheduled departure was 10:05, used on 73 of 285 flights, with 10:00 (63 flights) and 12:15 (39 flights) next.
- Departs 10:0573 flights25.6%
- Departs 10:0063 flights22.1%
- Departs 12:1539 flights13.7%
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 10:05 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1378 runs 7 points worse at 77.3%. 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 1378 next to DTW to FLL
Every carrier on DTW to FLL combined arrived on time 71.5% of the time across 2,692 flights, so DL 1378 is 6 points ahead of it. Delta flew 1,808 flights on the same city pair under all its flight numbers, including this one, and those ran 73.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1378thin sample | 285 | 77.3% | 63 min | 2.46% | B |
| All Delta Air Lines on DTW–FLL | 1,808 | 73.6% | 69 min | 1.66% | C |
| All carriers on DTW–FLL | 2,692 | 71.5% | 69 min | 2.34% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1378 quarter by quarter
Quarter by quarter DL 1378 held fairly steady: 80.0% in Jul–Sep 2025, 74.1% in Oct–Dec 2025, 77.9% in Jan–Mar 2026 and 82.8% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights80.0%
- Oct–Dec 202589 flights74.1%
- Jan–Mar 202690 flights77.9%
- Apr–Jun 202664 flights82.8%
- Jul–Sep 202612 flights—
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1378 did best on Wednesday at 82.5% on time and worst on Sunday at 69.2%. Each day rests on about 41 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1378 runs when it is late
The 63 late arrivals split 27 under half an hour, 13 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early63 flights22.7%
- Within 15 min151 flights54.5%
- 15–29 min late27 flights9.7%
- 30–59 min late13 flights4.7%
- 1–2 hours late15 flights5.4%
- 2+ hours late8 flights2.9%
Scale runs 0% to 100%.
Share of 277 completed flights by arrival against schedule.
14 of 54 late departures made up the time and arrived on time, 26% of them. In the other direction, 23 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at FLL.
The worst days
Worst days for DL 1378
The latest arrival of the period was on 20 January 2026, 6 hours 35 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 January 2026 | 6 hours 35 minutes | Carrier |
| 1 December 2025 | 4 hours 20 minutes | Carrier |
| 14 May 2026 | 3 hours 26 minutes | Carrier |
| 22 October 2025 | 3 hours 3 minutes | Carrier |
| 5 July 2026 | 2 hours 38 minutes | Carrier |
Delay causes
Why DL 1378 runs late
Carrier accounts for 54% of the 3,981 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Carrier
- 25%National Airspace System
- 19%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 54%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,145 of the 3,981 delay minutes reported here. The split is drawn from 3,981 delay minutes reported on DL 1378.
Cancellations sit at 2.46% against a national 1.89%, which is ordinary. Diversions add another 0.35%.
Connections and routes
What a delay on this flight costs
8.3% 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 about an hour, which a normal layover absorbs.
The 1,127 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.
The same number turns up on one other city pair in the data, including FLL to DTW (121), but none flew often enough under DL 1378 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DTW to FLL only.
One caution: this is a thin sample. 285 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 1378
For a booking, read DL 1378 as 77.3% on time with 2.46% cancelled over 285 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DTW to FLL, every carrier and departure
- FLL to DTW, the return direction
- Delta Air Lines 2296 on the same route59.7%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Fort Lauderdale-Hollywood International (FLL) 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
- Connecting flights: how much buffer the data says you need
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.