Flight number record
AS 563
Alaska Airlines · Kansas City to Seattle
- Route
- MCI → SEA
- Departs
- 07:00
- Flights
- 288
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AS 563, check with Alaska Airlines.
AS 563 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 13 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 288 flights, with a median arrival 8 minutes early.
Set against the rest of the country, AS 563's record is 13 points better than the US average of 77.3%. That gap is worth roughly 132 fewer late arrivals for every thousand flights.
Key figures
On time
90.5%
Arrivals under 15 minutes late, of 285 completed flights
Avg delay
111 min
Across delayed arrivals only, not all flights
Cancelled
1.04%
National rate is 1.89%
1 hour+ late
2.8%
National rate is 8.3%
These figures cover 288 flights between September 2025 and August 2026. The median arrival is 8 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 AS 563 flies
AS 563 flies MCI to SEA without a single fixed slot. Its most common scheduled departure was 07:00, used on 139 of 288 flights, with 06:02 (70 flights) and 06:15 (32 flights) next.
- Departs 07:00139 flights48.3%
- Departs 06:0270 flights24.3%
- Departs 06:1532 flights11.1%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and AS 563 runs level with that at 90.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
AS 563 next to MCI to SEA
Every carrier on MCI to SEA combined arrived on time 85.0% of the time across 1,126 flights, so AS 563 is 6 points ahead of it. Alaska flew 745 flights on the same city pair under all its flight numbers, including this one, and those ran 84.7% on time. Across its whole network Alaska Airlines managed 79.7%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AS 563thin sample | 288 | 90.5% | 111 min | 1.04% | A |
| All Alaska Airlines on MCI–SEA | 745 | 84.7% | 63 min | 0.67% | B+ |
| All carriers on MCI–SEA | 1,126 | 85.0% | 65 min | 0.98% | A+ |
| Alaska Airlines, whole network | 309,844 | 79.7% | 52 min | 1.20% | B |
Across the year
AS 563 quarter by quarter
AS 563 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Oct–Dec 2025 at 82.6%, a swing of 17 points on roughly 72 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 flights100.0%
- Oct–Dec 202588 flights82.6%
- Jan–Mar 202617 flights—
- Apr–Jun 202691 flights93.3%
- Jul–Sep 202662 flights93.5%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, AS 563 did best on Monday at 97.7% on time and worst on Friday at 82.9%. Each day rests on about 41 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AS 563 runs when it is late
AS 563 often beats the schedule: 102 of 285 completed flights, 36%, arrived 15 minutes or more early. The 27 late arrivals split 12 under half an hour, 7 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early102 flights35.8%
- Within 15 min156 flights54.7%
- 15–29 min late12 flights4.2%
- 30–59 min late7 flights2.5%
- 1–2 hours late2 flights0.7%
- 2+ hours late6 flights2.1%
Scale runs 0% to 100%.
Share of 285 completed flights by arrival against schedule.
5 of 22 late departures made up the time and arrived on time, 23% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for AS 563
The latest arrival of the period was on 10 April 2026, 9 hours 44 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 April 2026 | 9 hours 44 minutes | Late-arriving aircraft |
| 1 October 2025 | 8 hours 27 minutes | Carrier |
| 19 August 2026 | 8 hours 1 minute | Late-arriving aircraft |
| 6 October 2025 | 5 hours 41 minutes | Carrier |
| 9 June 2026 | 3 hours 31 minutes | Carrier |
Delay causes
Why AS 563 runs late
Carrier accounts for 54% of the 3,002 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Carrier
- 35%Late-arriving aircraft
- 9%National Airspace System
- 1%Security
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,002 reported delay minutes here, that single category outweighs weather by 35 to one. The split is drawn from 3,002 delay minutes reported on AS 563.
Cancellations sit at 1.04% against a national 1.89%, 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 2.8% 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 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 288 flights under AS 563 in the data flew MCI to SEA. 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. 288 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 AS 563
For a booking, AS 563 has one of the better records a US domestic flight can show: 90.5% on time and 1.04% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- MCI to SEA, every carrier and departure
- SEA to MCI, the return direction
- Delta Air Lines 2105 on the same route87.0%
- Alaska Airlines 418 on the same route83.3%
- Kansas City International (MCI) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Alaska Airlines on-time record
- Every Alaska Airlines 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 Alaska Airlines’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.