Flight number record

DL 406

Delta Air Lines · Bozeman to Atlanta

Route: BZN → ATL
Departs: 14:39
Flights: 364
Period: September 2025 to August 2026

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

DL 406 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 77.3%. When something does go wrong the average delay runs about 2.1 hours. That rests on 364 flights, with a median arrival 20 minutes early.

Set against the rest of the country, DL 406's record is 9 points better than the US average of 77.3%. That gap is worth roughly 88 fewer late arrivals for every thousand flights.

On time

86.1%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

129 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.89%

1 hour+ late

5.8%

National rate is 8.3%

These figures cover 364 flights between September 2025 and August 2026. The median arrival is 20 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.

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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) and 14:15 (54 flights) next.

Departs 14:3957 flights15.7%
Departs 14:1956 flights15.4%
Departs 14:1554 flights14.8%

Scale runs 0% to 100%.

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 71.9%, and DL 406 runs 14 points better at 86.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

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Against the route

DL 406 next to BZN to ATL

Every carrier on BZN to ATL combined arrived on time 86.0% of the time across 437 flights, so DL 406 is about level with it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 5 points.

DL 406 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 406thin sample	364	86.1%	129 min	0.82%	A+
All Delta Air Lines on BZN–ATL	437	86.0%	113 min	1.37%	A
All carriers on BZN–ATL	437	86.0%	113 min	1.37%	A
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 406 quarter by quarter

DL 406 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Jul–Sep 2026 at 79.0%, a swing of 21 points on roughly 73 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 202530 flights100.0%
Oct–Dec 202591 flights85.4%
Jan–Mar 202690 flights89.8%
Apr–Jun 202691 flights83.5%
Jul–Sep 202662 flights79.0%

Scale runs 70% to 100%.

By weekday, DL 406 did best on Tuesday at 92.3% on time and worst on Sunday at 76.9%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 406 runs when it is late

DL 406 often beats the schedule: 225 of 360 completed flights, 63%, arrived 15 minutes or more early. The 50 late arrivals split 15 under half an hour, 14 between 30 and 60 minutes, and 21 an hour or more.

15+ min early225 flights62.5%
Within 15 min85 flights23.6%
15–29 min late15 flights4.2%
30–59 min late14 flights3.9%
1–2 hours late11 flights3.1%
2+ hours late10 flights2.8%

Scale runs 0% to 100%.

Share of 360 completed flights by arrival against schedule.

A late pushback is often recovered here: of 63 departures that left 15 minutes late or more, 25 still arrived on time. 12 flights left on time and still arrived late.

The worst days

Worst days for DL 406

The latest arrival of the period was on 19 November 2025, 16 hours 30 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.

The latest arrivals of DL 406 in the period
Date	Arrived late by	Largest filed cause
19 November 2025	16 hours 30 minutes	Carrier
15 March 2026	16 hours 15 minutes	Extreme weather
7 December 2025	16 hours 2 minutes	Carrier
8 October 2025	8 hours 20 minutes	Carrier
28 November 2025	7 hours 13 minutes	Carrier

Delay causes

Why DL 406 runs late

Carrier accounts for 63% of the 6,446 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
63%
Late-arriving aircraft
15%
Extreme weather
15%
National Airspace System
7%

Extreme weather accounts for 15% 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 6,446 delay minutes reported on DL 406.

Cancellations are rare at 0.82%, below the national 1.89% 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

5.8% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 2.1 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, 81.3% 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	81.3%	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: 86.1% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures