Flight number record
DL 2637
Delta Air Lines · Nashville to Atlanta
- Route
- BNA → ATL
- Departs
- 05:15
- Flights
- 355
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 355 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 77.3%. That gap is worth roughly 178 fewer late arrivals for every thousand flights.
Key figures
On time
95.1%
Arrivals under 15 minutes late, of 345 completed flights
Avg delay
114 min
Across delayed arrivals only, not all flights
Cancelled
2.82%
National rate is 1.89%
1 hour+ late
2.9%
National rate is 8.3%
These figures cover 355 flights between September 2025 and August 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.
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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 190 of 355 flights, with 05:10 (57 flights) and 05:25 (44 flights) next.
- Departs 05:15190 flights53.5%
- Departs 05:1057 flights16.1%
- Departs 05:2544 flights12.4%
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 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 95.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 2637 next to BNA to ATL
Every carrier on BNA to ATL combined arrived on time 82.7% of the time across 4,271 flights, so DL 2637 is 12 points ahead of it. Delta flew 3,368 flights on the same city pair under all its flight numbers, including this one, and those ran 86.1% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2637thin sample | 355 | 95.1% | 114 min | 2.82% | A |
| All Delta Air Lines on BNA–ATL | 3,368 | 86.1% | 78 min | 2.05% | A |
| All carriers on BNA–ATL | 4,271 | 82.7% | 70 min | 1.66% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2637 quarter by quarter
Quarter by quarter DL 2637 held fairly steady: 100.0% in Jul–Sep 2025, 95.3% in Oct–Dec 2025, 93.7% in Jan–Mar 2026, 94.4% in Apr–Jun 2026 and 95.2% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights100.0%
- Oct–Dec 202588 flights95.3%
- Jan–Mar 202684 flights93.7%
- Apr–Jun 202691 flights94.4%
- Jul–Sep 202662 flights95.2%
Scale runs 85% to 100%.
By weekday, DL 2637 ranged from 92.0% on Monday to 98.1% on Wednesday. With about 51 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 2637 runs when it is late
DL 2637 often beats the schedule: 212 of 345 completed flights, 61%, arrived 15 minutes or more early. When DL 2637 is late it tends to be very late: 10 of its 17 late arrivals were an hour or more behind, and 5 were two hours or more.
- 15+ min early212 flights61.4%
- Within 15 min116 flights33.6%
- 15–29 min late2 flights0.6%
- 30–59 min late5 flights1.4%
- 1–2 hours late5 flights1.4%
- 2+ hours late5 flights1.4%
Scale runs 0% to 100%.
Share of 345 completed flights by arrival against schedule.
4 of 20 late departures made up the time and arrived on time, 20% of them. Only 1 left on time and still arrived late.
The worst days
Worst days for DL 2637
The latest arrival of the period was on 8 December 2025, 7 hours 21 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.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 December 2025 | 7 hours 21 minutes | Carrier |
| 9 April 2026 | 6 hours 8 minutes | Carrier |
| 20 July 2026 | 3 hours 24 minutes | Carrier |
| 21 February 2026 | 2 hours 42 minutes | Late-arriving aircraft |
| 1 July 2026 | 2 hours 16 minutes | Carrier |
Delay causes
Why DL 2637 runs late
Carrier accounts for 83% of the 1,929 delay minutes carriers reported here, and the remaining four split what is left.
- 83%Carrier
- 12%Late-arriving aircraft
- 5%National Airspace System
The largest share of delay minutes, 83%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,595 of the 1,929 delay minutes reported here. The split is drawn from 1,929 delay minutes reported on DL 2637.
Cancellations run at 2.82%, against 1.89% 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 2.9% land an hour or more behind schedule, against 8.3% 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 355 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. 355 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: 2.82% of its 355 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.
Related
Where to go next
- BNA to ATL, every carrier and departure
- ATL to BNA, the return direction
- Delta Air Lines 3001 on the same route87.5%
- Delta Air Lines 3069 on the same route92.0%
- Delta Air Lines 2802 on the same route87.8%
- Nashville International (BNA) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
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 ; recomputed monthly. How this data is collected.