Flight number record

DL 346

Delta Air Lines · Denver to Atlanta

Route: DEN → ATL
Departs: 10:50
Flights: 339
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 346, check with Delta Air Lines.

DL 346 lands a B, 3 points 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 339 flights, with a median arrival 4 minutes early.

On time

80.2%

Arrivals under 15 minutes late, of 334 completed flights

Avg delay

56 min

Across delayed arrivals only, not all flights

Cancelled

1.18%

National rate is 1.81%

1 hour+ late

5.4%

National rate is 8.1%

These figures cover 339 flights between July 2025 and June 2026. The median arrival is 4 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 346 flies

DL 346 flies DEN to ATL without a single fixed slot. Its most common scheduled departure was 10:50, used on 48 of 339 flights, with 10:31 (36 flights) and 10:40 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 10:5048 flights14.2%
Departs 10:3136 flights10.6%
Departs 10:4035 flights10.3%

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 10:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 346 runs 4 points worse at 80.2%. 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 346 next to DEN to ATL

Every carrier on DEN to ATL combined arrived on time 80.0% of the time across 5,596 flights, so DL 346 is about level with it. Delta flew 2,805 flights on the same city pair under all its flight numbers, including this one, and those ran 86.3% on time. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 346 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 346thin sample	339	80.2%	56 min	1.18%	B
All Delta Air Lines on DEN–ATL	2,805	86.3%	71 min	1.07%	A
All carriers on DEN–ATL	5,596	80.0%	62 min	0.86%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 346 quarter by quarter

Quarter by quarter DL 346 held fairly steady: 83.7% in Jul–Sep 2025, 73.9% in Oct–Dec 2025, 82.1% in Jan–Mar 2026 and 79.8% 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 202592 flights83.7%
Oct–Dec 202570 flights73.9%
Jan–Mar 202686 flights82.1%
Apr–Jun 202691 flights79.8%

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

By weekday, DL 346 ranged from 76.0% on Monday to 84.0% on Wednesday. With about 48 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 346 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 42% of the 3,702 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
42%
Carrier
31%
National Airspace System
15%
Extreme weather
11%

Extreme weather accounts for 11% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.8 times the usual weather exposure. The split is drawn from 3,702 delay minutes reported on DL 346.

Cancellations sit at 1.18% against a national 1.81%, which is ordinary. Diversions add another 0.29%.

Connections and routes

What a delay on this flight costs

5.4% 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 1,199 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 ATL to DEN (100), but none flew often enough under DL 346 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to ATL only.

One caution: this is a thin sample. 339 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 346

For a booking, read DL 346 as 80.2% on time with 1.18% cancelled over 339 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