Flight number record
DL 1637
Delta Air Lines · Atlanta to Wichita
- Route
- ATL → ICT
- Departs
- 09:20
- Flights
- 349
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1637, check with Delta Air Lines.
DL 1637 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 12 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 45 minutes. That rests on 349 flights, with a median arrival 10 minutes early.
Set against the rest of the country, DL 1637's record is 12 points better than the US average of 77.6%. That gap is worth roughly 122 fewer late arrivals for every thousand flights.
Key figures
On time
89.8%
Arrivals under 15 minutes late, of 344 completed flights
Avg delay
45 min
Across delayed arrivals only, not all flights
Cancelled
1.43%
National rate is 1.81%
1 hour+ late
2.6%
National rate is 8.1%
These figures cover 349 flights between July 2025 and June 2026. The median arrival is 10 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 1637 flies
DL 1637 flies ATL to ICT without a single fixed slot. Its most common scheduled departure was 09:20, used on 55 of 349 flights, with 09:21 (36 flights) and 09:12 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 09:2055 flights15.8%
- Departs 09:2136 flights10.3%
- Departs 09:1235 flights10.0%
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 09:20 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and DL 1637 runs 6 points better at 89.8%. 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 1637 next to ATL to ICT
Every carrier on ATL to ICT combined arrived on time 86.8% of the time across 1,147 flights, so DL 1637 is 3 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1637thin sample | 349 | 89.8% | 45 min | 1.43% | A |
| All Delta Air Lines on ATL–ICT | 1,147 | 86.8% | 54 min | 1.31% | A |
| All carriers on ATL–ICT | 1,147 | 86.8% | 54 min | 1.31% | A |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 1637 quarter by quarter
DL 1637 did not run the same all year. Its best quarter was Jul–Sep 2025 at 97.8% on time and its weakest Oct–Dec 2025 at 82.5%, a swing of 15 points on roughly 87 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 202592 flights97.8%
- Oct–Dec 202580 flights82.5%
- Jan–Mar 202686 flights89.0%
- Apr–Jun 202691 flights88.9%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1637 did best on Wednesday at 96.0% on time and worst on Tuesday at 82.0%. Each day rests on about 50 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 1637 runs late
One category carries most of the weight here. Carrier accounts for 61% of the 1,588 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.
- 61%Carrier
- 18%Late-arriving aircraft
- 17%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 61%, 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 962 of the 1,588 delay minutes reported here. The split is drawn from 1,588 delay minutes reported on DL 1637.
Cancellations sit at 1.43% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
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.
The 782 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.
DL 1637 is not only a ATL to ICT flight. It also flew ICT to ATL (349 flights, 85.4% 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. 349 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| ICT to ATLthin sample | 349 | 85.4% | 50 min | 1.15% | A |
What to do with this
Booking DL 1637
For a booking, DL 1637 has one of the better records a US domestic flight can show: 89.8% on time and 1.43% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- ATL to ICT, every carrier and departure
- ICT to ATL, the return direction
- Delta Air Lines 2959 on the same route85.8%
- Delta Air Lines 2128 on the same route83.8%
- 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
- Worst months to fly in the US, ranked by the data
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.