Flight number record

DL 1479

Delta Air Lines · Columbus to Atlanta

Route: CMH → ATL
Departs: 10:10
Flights: 308
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1479, check with Delta Air Lines.

DL 1479 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 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 308 flights, with a median arrival 12 minutes early.

Set against the rest of the country, DL 1479's record is 12 points better than the US average of 77.6%. That gap is worth roughly 124 fewer late arrivals for every thousand flights.

On time

90.0%

Arrivals under 15 minutes late, of 301 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

2.27%

National rate is 1.81%

1 hour+ late

4.0%

National rate is 8.1%

These figures cover 308 flights between July 2025 and June 2026. The median arrival is 12 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 1479 flies

DL 1479 flies CMH to ATL without a single fixed slot. Its most common scheduled departure was 10:10, used on 62 of 308 flights, with 11:10 (37 flights) and 10:02 (34 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:1062 flights20.1%
Departs 11:1037 flights12.0%
Departs 10:0234 flights11.0%

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 10:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 1479 runs 6 points better at 90.0%. 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 1479 next to CMH to ATL

Every carrier on CMH to ATL combined arrived on time 85.9% of the time across 3,160 flights, so DL 1479 is 4 points ahead of it. Delta flew 2,693 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 8 points.

DL 1479 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1479thin sample	308	90.0%	79 min	2.27%	A
All Delta Air Lines on CMH–ATL	2,693	88.2%	92 min	1.56%	A
All carriers on CMH–ATL	3,160	85.9%	82 min	1.52%	A
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1479 quarter by quarter

DL 1479 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jan–Mar 2026 at 81.2%, a swing of 16 points on roughly 77 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 202561 flights96.7%
Oct–Dec 202572 flights87.3%
Jan–Mar 202687 flights81.2%
Apr–Jun 202688 flights96.4%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1479 did best on Wednesday at 97.8% on time and worst on Monday at 80.9%. Each day rests on about 44 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1479 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 2,360 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.

Late-arriving aircraft
43%
Carrier
38%
National Airspace System
14%
Extreme weather
4%

43% 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 2,360 reported delay minutes here, that single category outweighs weather by 11 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 2,360 delay minutes reported on DL 1479.

Cancellations sit at 2.27% 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 4.0% 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.

DL 1479 is not only a CMH to ATL flight. It also flew ATL to CMH (274 flights, 90.6% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 308 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.

Other routes flown as DL 1479
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
ATL to CMHthin sample	274	90.6%	50 min	2.19%	A

What to do with this

Booking DL 1479

For a booking, read DL 1479 as 90.0% on time with 2.27% cancelled over 308 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