Flight number record

DL 1626

Delta Air Lines · St. Louis to Detroit

Route: STL → DTW
Departs: 06:40
Flights: 347
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1626, check with Delta Air Lines.

DL 1626 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 15 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 347 flights, with a median arrival 16 minutes early.

Set against the rest of the country, DL 1626's record is 15 points better than the US average of 77.6%. That gap is worth roughly 148 fewer late arrivals for every thousand flights.

On time

92.4%

Arrivals under 15 minutes late, of 340 completed flights

Avg delay

122 min

Across delayed arrivals only, not all flights

Cancelled

2.02%

National rate is 1.81%

1 hour+ late

4.7%

National rate is 8.1%

These figures cover 347 flights between July 2025 and June 2026. The median arrival is 16 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 1626 flies

DL 1626 flies STL to DTW without a single fixed slot. Its most common scheduled departure was 06:40, used on 152 of 347 flights, with 06:35 (60 flights) and 06:32 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:40152 flights43.8%
Departs 06:3560 flights17.3%
Departs 06:3236 flights10.4%

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 06:40 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 1626 runs 3 points better at 92.4%. 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 1626 next to STL to DTW

Every carrier on STL to DTW combined arrived on time 81.8% of the time across 1,905 flights, so DL 1626 is 11 points ahead of it. Delta flew 1,088 flights on the same city pair under all its flight numbers, including this one, and those ran 88.2% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 11 points.

DL 1626 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1626thin sample	347	92.4%	122 min	2.02%	A
All Delta Air Lines on STL–DTW	1,088	88.2%	102 min	1.65%	A
All carriers on STL–DTW	1,905	81.8%	87 min	1.15%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1626 quarter by quarter

Quarter by quarter DL 1626 held fairly steady: 97.8% in Jul–Sep 2025, 88.2% in Oct–Dec 2025, 91.6% in Jan–Mar 2026 and 91.2% in Apr–Jun 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202591 flights97.8%
Oct–Dec 202579 flights88.2%
Jan–Mar 202686 flights91.6%
Apr–Jun 202691 flights91.2%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1626 ranged from 87.0% on Monday to 98.0% on Thursday. With about 50 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.

Delay causes

Why DL 1626 runs late

One category carries most of the weight here. Carrier accounts for 78% of the 3,176 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
78%
Late-arriving aircraft
10%
Extreme weather
8%
National Airspace System
4%

The largest share of delay minutes, 78%, 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 2,488 of the 3,176 delay minutes reported here. The split is drawn from 3,176 delay minutes reported on DL 1626.

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

Badly late arrivals are rare here: only 4.7% land an hour or more behind schedule, against 8.1% 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.

The same number turns up on one other city pair in the data, including JFK to BOS (16), but none flew often enough under DL 1626 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to STL to DTW only.

One caution: this is a thin sample. 347 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 1626

For a booking, read DL 1626 as 92.4% on time with 2.02% cancelled over 347 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