Flight number record
DL 1637
Delta Air Lines · Wichita to Atlanta
- Route
- ICT → ATL
- Departs
- 11:25
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1637, check with Delta Air Lines.
DL 1637 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 349 flights, with a median arrival 13 minutes early.
Set against the rest of the country, DL 1637's record is 7 points better than the US average of 77.3%. That gap is worth roughly 72 fewer late arrivals for every thousand flights.
Key figures
On time
84.5%
Arrivals under 15 minutes late, of 341 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
1.15%
National rate is 1.89%
1 hour+ late
4.1%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 2026. The median arrival is 13 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 1637 flies
DL 1637 flies ICT to ATL without a single fixed slot. Its most common scheduled departure was 11:25, used on 59 of 349 flights, with 11:19 (51 flights) and 11:28 (36 flights) next.
- Departs 11:2559 flights16.9%
- Departs 11:1951 flights14.6%
- Departs 11:2836 flights10.3%
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 11:25 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1637 runs 6 points better at 84.5%. 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 1637 next to ICT to ATL
Every carrier on ICT to ATL combined arrived on time 86.7% of the time across 1,152 flights, so DL 1637 is 2 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1637thin sample | 349 | 84.5% | 69 min | 1.15% | B |
| All Delta Air Lines on ICT–ATL | 1,152 | 86.7% | 69 min | 1.48% | A |
| All carriers on ICT–ATL | 1,152 | 86.7% | 69 min | 1.48% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | 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 93.3% on time and its weakest Oct–Dec 2025 at 81.0%, a swing of 12 points on roughly 70 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 flights93.3%
- Oct–Dec 202580 flights81.0%
- Jan–Mar 202686 flights85.4%
- Apr–Jun 202691 flights84.4%
- Jul–Sep 202662 flights83.3%
Scale runs 75% to 100%.
By weekday, DL 1637 did best on Friday at 93.8% on time and worst on Sunday at 76.6%. Each day rests on about 50 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1637 runs when it is late
DL 1637 often beats the schedule: 150 of 341 completed flights, 44%, arrived 15 minutes or more early. The 53 late arrivals split 21 under half an hour, 18 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early150 flights44.0%
- Within 15 min138 flights40.5%
- 15–29 min late21 flights6.2%
- 30–59 min late18 flights5.3%
- 1–2 hours late6 flights1.8%
- 2+ hours late8 flights2.3%
Scale runs 0% to 100%.
Share of 341 completed flights by arrival against schedule.
15 of 64 late departures made up the time and arrived on time, 23% of them. Only 4 left on time and still arrived late.
The worst days
Worst days for DL 1637
The latest arrival of the period was on 18 August 2026, 8 hours 32 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 August 2026 | 8 hours 32 minutes | Carrier |
| 26 August 2026 | 4 hours 17 minutes | Extreme weather |
| 10 September 2025 | 3 hours 51 minutes | Carrier |
| 25 November 2025 | 3 hours 9 minutes | Late-arriving aircraft |
| 18 May 2026 | 3 hours 8 minutes | Carrier |
Delay causes
Why DL 1637 runs late
Carrier accounts for 47% of the 3,650 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Carrier
- 39%Late-arriving aircraft
- 7%Extreme weather
- 7%National Airspace System
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,650 reported delay minutes here, that single category outweighs weather by 5 to one. The split is drawn from 3,650 delay minutes reported on DL 1637.
Cancellations sit at 1.15% against a national 1.89%, which is ordinary. Diversions add another 1.15%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.1% 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.
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.
DL 1637 is not only a ICT to ATL flight. It also flew ATL to ICT (349 flights, 89.2% 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. 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 |
|---|---|---|---|---|---|
| ATL to ICTthin sample | 349 | 89.2% | 51 min | 1.43% | A |
What to do with this
Booking DL 1637
For a booking, read DL 1637 as 84.5% on time with 1.15% cancelled over 349 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ICT to ATL, every carrier and departure
- ATL to ICT, the return direction
- Delta Air Lines 2216 on the same route95.2%
- Delta Air Lines 2128 on the same route82.3%
- 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
- Why the first flight of the morning is statistically safest
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.