Flight number record

DL 406

Delta Air Lines · Bozeman to Atlanta

Route: BZN → ATL
Departs: 14:39
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 406, check with Delta Air Lines.

DL 406 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 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 2.3 hours. That rests on 364 flights, with a median arrival 21 minutes early.

Set against the rest of the country, DL 406's record is 10 points better than the US average of 77.6%. That gap is worth roughly 99 fewer late arrivals for every thousand flights.

On time

87.5%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

138 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.81%

1 hour+ late

5.6%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. The median arrival is 21 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 406 flies

DL 406 flies BZN to ATL without a single fixed slot. Its most common scheduled departure was 14:39, used on 57 of 364 flights, with 14:19 (56 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:3957 flights15.7%
Departs 14:1956 flights15.4%

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 14:39 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and DL 406 runs 15 points better at 87.5%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 406 next to BZN to ATL

Every carrier on BZN to ATL combined arrived on time 86.8% of the time across 426 flights, so DL 406 is about level with it. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 6 points.

DL 406 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 406thin sample	364	87.5%	138 min	0.82%	A+
All Delta Air Lines on BZN–ATL	426	86.8%	142 min	1.41%	A
All carriers on BZN–ATL	426	86.8%	142 min	1.41%	A
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 406 quarter by quarter

Quarter by quarter DL 406 held fairly steady: 91.2% in Jul–Sep 2025, 85.4% in Oct–Dec 2025, 89.8% in Jan–Mar 2026 and 83.5% in Apr–Jun 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights91.2%
Oct–Dec 202591 flights85.4%
Jan–Mar 202690 flights89.8%
Apr–Jun 202691 flights83.5%

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

By weekday, DL 406 did best on Saturday at 93.9% on time and worst on Sunday at 78.8%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 406 runs late

One category carries most of the weight here. Carrier accounts for 64% of the 6,218 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
64%
Extreme weather
16%
Late-arriving aircraft
15%
National Airspace System
6%

Extreme weather accounts for 16% 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 2.5 times the usual weather exposure. The split is drawn from 6,218 delay minutes reported on DL 406.

Cancellations are rare at 0.82%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

5.6% 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 2.3 hours, which a normal layover absorbs.

At 1,640 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

DL 406 is not only a BZN to ATL flight. It also flew ATL to BZN (364 flights, 81.2% 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. 364 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 406
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
ATL to BZNthin sample	364	81.2%	47 min	0.82%	B+

What to do with this

Booking DL 406

For a booking, DL 406 has one of the better records a US domestic flight can show: 87.5% on time and 0.82% 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