Route
SEA → SJC
Seattle–Tacoma International Airport Mineta San Jose International Airport
How punctual is this route?
- On-time arrivals
- 80.1%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 54 min
- Flights arriving 15+ minutes late
- Flights tracked
- 4,425
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 42%
- Late-arriving aircraft 37%
- Air traffic control & airport 11%
- Extreme weather 9%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 83.1% | 367 |
| October 2025 | 84.5% | 392 |
| November 2025 | 84.9% | 374 |
| December 2025 | 77.7% | 353 |
| January 2026 | 83.2% | 331 |
| February 2026 | 84.5% | 342 |
| March 2026 | 80.8% | 330 |
| April 2026 | 89.5% | 305 |
| May 2026 | 86.4% | 355 |
| June 2026 | 76.3% | 402 |
| July 2026 | 69.9% | 438 |
| August 2026 | 67.2% | 436 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Alaska Airlines | 1,887 | 79.8% | 1.1% | 50 min |
| SkyWest Airlines | 1,626 | 85.7% | 0.2% | 66 min |
| Southwest Airlines | 903 | 70.5% | 0.2% | 50 min |
| American Airlines | 4 | 100.0% | 0.0% | — |
| Delta Air Lines | 4 | 100.0% | 0.0% | — |
| United Airlines | 1 | 100.0% | 0.0% | — |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
OO3789
16% late · 345 flights
-
OO3736
9% late · 255 flights
-
OO3956
21% late · 231 flights
-
AS657
25% late · 227 flights
-
AS1303
20% late · 218 flights
-
AS521
14% late · 197 flights
-
AS1341
9% late · 194 flights
-
OO4100
16% late · 165 flights
-
AS761
24% late · 141 flights
-
AS1310
23% late · 117 flights
-
OO3897
18% late · 117 flights
-
OO3559
8% late · 108 flights
-
OO3840
9% late · 108 flights
-
OO3557
6% late · 101 flights
-
AS335
28% late · 84 flights
-
AS154
19% late · 78 flights
-
OO4132
15% late · 73 flights
-
AS539
27% late · 70 flights
-
AS1448
3% late · 69 flights
-
AS319
55% late · 69 flights
-
WN2089
25% late · 57 flights
-
AS1200
15% late · 55 flights
-
OO3999
11% late · 54 flights
-
AS1366
20% late · 50 flights
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