Flight number record

DL 1378

Delta Air Lines · Detroit to Fort Lauderdale

Route: DTW → FLL
Departs: 10:05
Flights: 335
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1378, check with Delta Air Lines.

DL 1378 lands a B, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 335 flights, with a median arrival 5 minutes early.

On time

78.8%

Arrivals under 15 minutes late, of 325 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

2.09%

National rate is 1.81%

1 hour+ late

7.1%

National rate is 8.1%

These figures cover 335 flights between July 2025 and June 2026. The median arrival is 5 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 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 335 flights, with 10:00 (55 flights) and 12:15 (39 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:0573 flights21.8%
Departs 10:0055 flights16.4%
Departs 12:1539 flights11.6%

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 10:05 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 1378 runs 5 points worse at 78.8%. 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 1378 next to DTW to FLL

Every carrier on DTW to FLL combined arrived on time 72.4% of the time across 2,706 flights, so DL 1378 is 6 points ahead of it. Delta flew 1,815 flights on the same city pair under all its flight numbers, including this one, and those ran 74.2% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 3 points.

DL 1378 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1378thin sample	335	78.8%	63 min	2.09%	B
All Delta Air Lines on DTW–FLL	1,815	74.2%	70 min	1.43%	C
All carriers on DTW–FLL	2,706	72.4%	70 min	1.85%	C
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1378 quarter by quarter

Quarter by quarter DL 1378 held fairly steady: 81.1% 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 202592 flights81.1%
Oct–Dec 202589 flights74.1%
Jan–Mar 202690 flights77.9%
Apr–Jun 202664 flights82.8%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1378 ranged from 75.5% on Saturday to 81.2% on Wednesday. With about 48 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 1378 runs late

One category carries most of the weight here. Carrier accounts for 51% of the 4,310 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
51%
National Airspace System
26%
Late-arriving aircraft
21%
Extreme weather
2%

The largest share of delay minutes, 51%, 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 2,198 of the 4,310 delay minutes reported here. The split is drawn from 4,310 delay minutes reported on DL 1378.

Cancellations sit at 2.09% against a national 1.81%, which is ordinary. Diversions add another 0.90%.

Connections and routes

What a delay on this flight costs

7.1% 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 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. 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.

The same number turns up on one other city pair in the data, including FLL to DTW (171), 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. 335 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 78.8% on time with 2.09% cancelled over 335 flights. Those are rates from the past twelve months, not a forecast for any particular 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