Route on-time record
MCI to SEA: most on-time flights and the best time to fly
Kansas City (Kansas City International Airport) to Seattle (Seattle–Tacoma International Airport). 1,132 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 1.2% were cancelled. The most reliable flight number was Alaska 563 at 6:15 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
MCI → SEA
Kansas City to Seattle: 1,132 nonstop flights a year
On time (12 months)
82%
Cancelled
1.2%
avg delay 14 min
Best time to leave
Noon to 3 PM
89% on time vs 61% 6 to 9 PM
Most reliable airline
Delta
83% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Alaska 563
6:15 AM → 8:24 AM4h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 90%
- Cancelled
- 1.5%
- Avg arrival delay
- 12 min
- Arrived on time 90% of the time (264 flights, Jun 2025 to May 2026).
Strong track record · 264 flights
Find Alaska 563 fares Opens this date on Aviasales#2 · Alaska 501
2:51 PM → 4:54 PM4h 03m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 93% of the time (30 flights, Jun 2025 to May 2026).
- Never cancelled in 30 scheduled flights.
- Leaves in this route's most on-time window (Noon to 3 PM: 89% on time; 6 to 9 PM: 61%).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
Limited track record · 30 flights
Find Alaska 501 fares Opens this date on Aviasales#3 · Delta 2105
7:55 AM → 10:00 AM4h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 85%
- Cancelled
- 1.9%
- Avg arrival delay
- 14 min
- Arrived on time 85% of the time (354 flights, Jun 2025 to May 2026).
Strong track record · 354 flights
Find Delta 2105 fares Opens this date on Aviasales#4 · Alaska 418
2:23 PM → 4:29 PM4h 05m nonstop
Local times, typical schedule. Last flown 2026-05-12.
78%
chance on time
- On time (history)
- 78%
- Cancelled
- 0.7%
- Avg arrival delay
- 14 min
- Arrived on time 78% of the time (302 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Noon to 3 PM: 89% on time; 6 to 9 PM: 61%).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
- 52% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 302 flights
Find Alaska 418 fares Opens this date on Aviasales#5 · Alaska 497
7:55 PM → 9:59 PM4h 04m nonstop
Local times, typical schedule. Last flown 2026-05-31.
68%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 14 min
- Arrived on time 75% of the time (16 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 61% on time; Noon to 3 PM: 89%).
- Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.
- 66% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 16 flights
Find Alaska 497 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Delta Air Lines83%
364 flights · 85% on time as flown · 1.7% cancel
- Alaska Airlines80%
742 flights · 81% on time as flown · 1.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM87%
642 flights · avg delay 13 min
- Noon to 3 PM89%
159 flights · avg delay 7 min
- 3 to 6 PM72%
202 flights · avg delay 19 min
- 6 to 9 PM61%
129 flights · avg delay 21 min
Best day: Tuesday (88%). Worst: Friday (82%).
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Airline (crew, maintenance, boarding)45%
- Late-arriving aircraft34%
- Air traffic control and airport volume19%
- Severe weather2%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
MCI to SEA questions
- What time of day is best to fly MCI to SEA?
- Noon to 3 PM: 89% of flights arrived on time, against 61% for departures 6 to 9 PM.
- Which airline is most on time from MCI to SEA?
- Delta, with a season-adjusted 83% chance of operating and arriving on time over 364 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on MCI to SEA?
- June (78% on time); the best was October (90%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from MCI
- SEA to MCI (return)
- MCI to DEN 75%
- MCI to ORD 74%
- MCI to ATL 87%
- MCI to DFW 73%
- MCI to PHX 79%
- MCI to MDW 80%
- MCI to DAL 81%
- MCI to LAS 81%
- MCI to DCA 74%
- MCI to LGA 76%
- MCI to MCO 79%
- MCI to BNA 83%
Most on-time flights from MCI on every route →
Live status: FAA delays and ground stops