Flight number record
DL 2256
Delta Air Lines · Seattle to Kansas City
- Route
- SEA → MCI
- Departs
- 17:50
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2256, check with Delta Air Lines.
DL 2256 lands a B, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 364 flights, with a median arrival 8 minutes early.
Key figures
On time
77.4%
Arrivals under 15 minutes late, of 354 completed flights
Avg delay
77 min
Across delayed arrivals only, not all flights
Cancelled
1.65%
National rate is 1.89%
1 hour+ late
9.3%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 9.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2256 flies
DL 2256 flies SEA to MCI without a single fixed slot. Its most common scheduled departure was 17:50, used on 151 of 364 flights, with 17:30 (117 flights) next.
- Departs 17:50151 flights41.5%
- Departs 17:30117 flights32.1%
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 17:50 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 2256 runs 9 points better at 77.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 2256 next to SEA to MCI
Every carrier on SEA to MCI combined arrived on time 81.2% of the time across 1,126 flights, so DL 2256 is 4 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2256thin sample | 364 | 77.4% | 77 min | 1.65% | B |
| All Delta Air Lines on SEA–MCIthin sample | 364 | 77.4% | 77 min | 1.65% | B |
| All carriers on SEA–MCI | 1,126 | 81.2% | 59 min | 0.80% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2256 quarter by quarter
DL 2256 did not run the same all year. Its best quarter was Jan–Mar 2026 at 83.5% on time and its weakest Jul–Sep 2025 at 60.0%, a swing of 24 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 flights60.0%
- Oct–Dec 202591 flights76.4%
- Jan–Mar 202690 flights83.5%
- Apr–Jun 202691 flights80.9%
- Jul–Sep 202662 flights73.8%
Scale runs 50% to 90%.
By weekday, DL 2256 did best on Saturday at 84.3% on time and worst on Friday at 72.0%. Each day rests on about 52 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2256 runs when it is late
DL 2256 often beats the schedule: 132 of 354 completed flights, 37%, arrived 15 minutes or more early. The 80 late arrivals split 26 under half an hour, 21 between 30 and 60 minutes, and 33 an hour or more.
- 15+ min early132 flights37.3%
- Within 15 min142 flights40.1%
- 15–29 min late26 flights7.3%
- 30–59 min late21 flights5.9%
- 1–2 hours late22 flights6.2%
- 2+ hours late11 flights3.1%
Scale runs 0% to 100%.
Share of 354 completed flights by arrival against schedule.
20 of 88 late departures made up the time and arrived on time, 23% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for DL 2256
The latest arrival of the period was on 11 December 2025, 13 hours 39 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 |
|---|---|---|
| 11 December 2025 | 13 hours 39 minutes | Carrier |
| 6 January 2026 | 4 hours 24 minutes | Late-arriving aircraft |
| 12 July 2026 | 4 hours 13 minutes | Carrier |
| 21 July 2026 | 4 hours 5 minutes | Carrier |
| 24 August 2026 | 3 hours 42 minutes | Carrier |
Delay causes
Why DL 2256 runs late
Carrier accounts for 65% of the 6,179 delay minutes carriers reported here, and the remaining four split what is left.
- 65%Carrier
- 25%Late-arriving aircraft
- 9%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 65%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,992 of the 6,179 delay minutes reported here. The split is drawn from 6,179 delay minutes reported on DL 2256.
Cancellations sit at 1.65% against a national 1.89%, which is ordinary. Diversions add another 1.10%.
Connections and routes
What a delay on this flight costs
9.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,490 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.
Every one of the 364 flights under DL 2256 in the data flew SEA to MCI. 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. 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.
What to do with this
Booking DL 2256
For a booking, read DL 2256 as 77.4% on time with 1.65% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SEA to MCI, every carrier and departure
- MCI to SEA, the return direction
- Alaska Airlines 418 on the same route88.9%
- Seattle-Tacoma International (SEA) delay statistics
- Kansas City International (MCI) 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
- How often a connection fails at the major US hubs
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.