Flight number record

DL 1485

Delta Air Lines · Atlanta to St. Louis

Route: ATL → STL
Departs: 15:25
Flights: 295
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1485, check with Delta Air Lines.

DL 1485 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 50 minutes. That rests on 295 flights, with a median arrival 6 minutes early.

Set against the rest of the country, DL 1485's record is 9 points better than the US average of 77.6%. That gap is worth roughly 89 fewer late arrivals for every thousand flights.

On time

86.5%

Arrivals under 15 minutes late, of 288 completed flights

Avg delay

49 min

Across delayed arrivals only, not all flights

Cancelled

1.36%

National rate is 1.81%

1 hour+ late

2.4%

National rate is 8.1%

These figures cover 295 flights between July 2025 and June 2026. The median arrival is 6 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 1485 flies

DL 1485 flies ATL to STL without a single fixed slot. Its most common scheduled departure was 15:25, used on 64 of 295 flights, with 14:08 (45 flights) and 15:24 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 15:2564 flights21.7%
Departs 14:0845 flights15.3%
Departs 15:2436 flights12.2%

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 15:25 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 1485 runs 14 points better at 86.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 1485 next to ATL to STL

Every carrier on ATL to STL combined arrived on time 82.4% of the time across 3,706 flights, so DL 1485 is 4 points ahead of it. Delta flew 2,371 flights on the same city pair under all its flight numbers, including this one, and those ran 84.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 5 points.

DL 1485 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1485thin sample	295	86.5%	49 min	1.36%	A
All Delta Air Lines on ATL–STL	2,371	84.7%	55 min	1.98%	B
All carriers on ATL–STL	3,706	82.4%	56 min	1.54%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1485 quarter by quarter

Quarter by quarter DL 1485 held fairly steady: 86.6% in Jul–Sep 2025, 90.8% in Oct–Dec 2025, 81.2% in Jan–Mar 2026 and 85.5% 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 202586 flights86.6%
Oct–Dec 202589 flights90.8%
Jan–Mar 202665 flights81.2%
Apr–Jun 202655 flights85.5%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1485 did best on Friday at 95.0% on time and worst on Monday at 81.0%. Each day rests on about 42 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1485 runs late

One category carries most of the weight here. Carrier accounts for 60% of the 1,898 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
60%
National Airspace System
19%
Late-arriving aircraft
16%
Extreme weather
4%

The largest share of delay minutes, 60%, 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 1,144 of the 1,898 delay minutes reported here. The split is drawn from 1,898 delay minutes reported on DL 1485.

Cancellations sit at 1.36% against a national 1.81%, which is ordinary. Diversions add another 1.02%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 2.4% 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 two other city pairs in the data, including STL to ATL (244) and RSW to DTW (36), but none flew often enough under DL 1485 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to STL only.

One caution: this is a thin sample. 295 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 1485

For a booking, DL 1485 has one of the better records a US domestic flight can show: 86.5% on time and 1.36% cancelled. That is a base rate, not a promise about any single 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