Route Reliability
Kansas City → Seattle
MCI–SEA · 1,490 miles · Kansas City International Airport to Seattle–Tacoma International Airport
- 82%
- Arrive within 15 minutes
- 5 min
- Average arrival delay
- 1.2%
- Cancelled
- 1,132
- Flights in the data
Data through May 2026.
Who flies it best
Ranked by on-time arrivals. Historical results, not predictions.
- 1.Delta Air Lines85%364 flights
- 2.Alaska Airlines81%742 flights
Not enough history to rank: Southwest Airlines (26 flights). We rank airlines only after 100 flights on the route.
What the data says
The 12–3 PM departure wins.
MCI–SEA flights departing between 12–3 PM arrived on time 89% of the time, versus 62% between 6–9 PM.
Friday is doing you no favors.
MCI–SEA flights arrived on time 89% of the time on Tuesdays. On Fridays: 77%.
Delta Air Lines has a slight edge here.
Delta Air Lines arrived on time 85% of the time on this route; Alaska Airlines managed 81%.
Trending in the right direction.
MCI–SEA flights arrived on time 90% of the time over the last three months in the data, compared with 80% in the three months before that.
Best historical flights
Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.
Top flights by on-time rate
More flights on this route
The breakdown
- Mon86%(164 flights)
- Tue89%(152 flights)
- Wed83%(150 flights)
- Thu82%(164 flights)
- Fri77%(159 flights)
- Sat82%(148 flights)
- Sun77%(176 flights)
- 6–9 AM87%(628 flights)
- 12–3 PM89%(159 flights)
- 3–6 PM74%(198 flights)
- 6–9 PM62%(128 flights)
Jun 75% → May 91% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 75% | 122 |
| July 2025 | 76% | 127 |
| August 2025 | 82% | 120 |
| September 2025 | 86% | 108 |
| October 2025 | 79% | 85 |
| November 2025 | 85% | 79 |
| December 2025 | 68% | 83 |
| January 2026 | 80% | 66 |
| February 2026 | 91% | 55 |
| March 2026 | 89% | 72 |
| April 2026 | 91% | 88 |
| May 2026 | 91% | 108 |
Keep nerding
Based on 1,132 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.