Flight number record

DL 2402

Delta Air Lines · Detroit to Philadelphia

Route: DTW → PHL
Departs: 21:30
Flights: 346
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2402, check with Delta Air Lines.

DL 2402 lands a B, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 346 flights, with a median arrival 12 minutes early.

Set against the rest of the country, DL 2402's record is 4 points better than the US average of 77.6%. That gap is worth roughly 41 fewer late arrivals for every thousand flights.

On time

81.7%

Arrivals under 15 minutes late, of 339 completed flights

Avg delay

69 min

Across delayed arrivals only, not all flights

Cancelled

2.02%

National rate is 1.81%

1 hour+ late

8.0%

National rate is 8.1%

These figures cover 346 flights between July 2025 and June 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 2402 flies

DL 2402 flies DTW to PHL without a single fixed slot. Its most common scheduled departure was 21:30, used on 99 of 346 flights, with 21:37 (62 flights) and 21:45 (43 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:3099 flights28.6%
Departs 21:3762 flights17.9%
Departs 21:4543 flights12.4%

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 21:30 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 2402 runs 11 points better at 81.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 2402 next to DTW to PHL

Every carrier on DTW to PHL combined arrived on time 78.5% of the time across 2,952 flights, so DL 2402 is 3 points ahead of it. Delta flew 1,557 flights on the same city pair under all its flight numbers, including this one, and those ran 80.1% on time. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 2402 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2402thin sample	346	81.7%	69 min	2.02%	B
All Delta Air Lines on DTW–PHL	1,557	80.1%	77 min	2.06%	B
All carriers on DTW–PHL	2,952	78.5%	86 min	2.95%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2402 quarter by quarter

DL 2402 did not run the same all year. Its best quarter was Jul–Sep 2025 at 87.5% on time and its weakest Jan–Mar 2026 at 76.7%, a swing of 11 points on roughly 87 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 202573 flights87.5%
Oct–Dec 202592 flights80.4%
Jan–Mar 202690 flights76.7%
Apr–Jun 202691 flights83.1%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2402 did best on Saturday at 91.7% on time and worst on Tuesday at 70.0%. Each day rests on about 49 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2402 runs late

One category carries most of the weight here. Carrier accounts for 45% of the 4,264 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
45%
Late-arriving aircraft
36%
National Airspace System
17%
Extreme weather
1%

36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,264 reported delay minutes here, that single category outweighs weather by 25 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,264 delay minutes reported on DL 2402.

Cancellations sit at 2.02% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

8.0% 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.

Every one of the 346 flights under DL 2402 in the data flew DTW to PHL. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 346 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 2402

For a booking, read DL 2402 as 81.7% on time with 2.02% cancelled over 346 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