Flight number record

DL 2637

Delta Air Lines · Nashville to Atlanta

Route: BNA → ATL
Departs: 05:15
Flights: 353
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2637, check with Delta Air Lines.

DL 2637 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 18 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 353 flights, with a median arrival 17 minutes early.

Set against the rest of the country, DL 2637's record is 18 points better than the US average of 77.6%. That gap is worth roughly 177 fewer late arrivals for every thousand flights.

On time

95.3%

Arrivals under 15 minutes late, of 343 completed flights

Avg delay

111 min

Across delayed arrivals only, not all flights

Cancelled

2.83%

National rate is 1.81%

1 hour+ late

2.6%

National rate is 8.1%

These figures cover 353 flights between July 2025 and June 2026. The median arrival is 17 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 2637 flies

DL 2637 flies BNA to ATL without a single fixed slot. Its most common scheduled departure was 05:15, used on 250 of 353 flights, with 05:25 (44 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:15250 flights70.8%
Departs 05:2544 flights12.5%

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 05:15 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2637 runs 6 points better at 95.3%. 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 2637 next to BNA to ATL

Every carrier on BNA to ATL combined arrived on time 84.5% of the time across 4,239 flights, so DL 2637 is 11 points ahead of it. Delta flew 3,360 flights on the same city pair under all its flight numbers, including this one, and those ran 87.1% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 14 points.

DL 2637 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2637thin sample	353	95.3%	111 min	2.83%	A
All Delta Air Lines on BNA–ATL	3,360	87.1%	72 min	2.02%	A
All carriers on BNA–ATL	4,239	84.5%	64 min	1.65%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2637 quarter by quarter

Quarter by quarter DL 2637 held fairly steady: 97.8% in Jul–Sep 2025, 95.3% in Oct–Dec 2025, 93.7% in Jan–Mar 2026 and 94.4% in Apr–Jun 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202590 flights97.8%
Oct–Dec 202588 flights95.3%
Jan–Mar 202684 flights93.7%
Apr–Jun 202691 flights94.4%

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2637 ranged from 92.3% on Tuesday to 100.0% on Wednesday. With about 50 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 2637 runs late

One category carries most of the weight here. Carrier accounts for 81% of the 1,783 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
81%
Late-arriving aircraft
13%
National Airspace System
6%

The largest share of delay minutes, 81%, 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 1,442 of the 1,783 delay minutes reported here. The split is drawn from 1,783 delay minutes reported on DL 2637.

Cancellations run at 2.83%, against 1.81% nationally. That is roughly one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 2.6% 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.

Every one of the 353 flights under DL 2637 in the data flew BNA to ATL. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 353 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 2637

For a booking, the cancellation rate is the figure to plan around on DL 2637: 2.83% of its 353 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.

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