AS521 Alaska Airlines - Flight Status

Which is the frequency of flight AS521?
The flight AS521 is scheduled to flight on daily basis.

Which is the distance of flight AS521?
The distance between the two airports is 697 miles.

Are the departure airport and arrival airport at the same Time Zone?
Yes, both airports are in the same timezone.

The following airlines serves the same route between San Jose and Seattle:

Alaska Airlines
- Flight Number: AS1304. (On Time performance: 69 - Average Delay: 10 minutes)
- Flight Number: AS1311. (On Time performance: 93 - Average Delay: 5 minutes)
- Flight Number: AS1314.
- Flight Number: AS1413. (On Time performance: 90 - Average Delay: 13 minutes)
- Flight Number: AS1426.
- Flight Number: AS2186. (On Time performance: 96 - Average Delay: 2 minutes)
- Flight Number: AS481.
- Flight Number: AS523. (On Time performance: 82 - Average Delay: 10 minutes)
- Flight Number: AS583. (On Time performance: 86 - Average Delay: 18 minutes)
- Flight Number: AS745. (On Time performance: 81 - Average Delay: 6 minutes)
- Flight Number: AS762. (On Time performance: 67 - Average Delay: 13 minutes)

Delta Air Lines
- Flight Number: DL3736. (On Time performance: 93 - Average Delay: 7 minutes)
- Flight Number: DL3789. (On Time performance: 92 - Average Delay: 3 minutes)
- Flight Number: DL3897. (On Time performance: 83 - Average Delay: 8 minutes)
- Flight Number: DL4041. (On Time performance: 91 - Average Delay: 4 minutes)
- Flight Number: DL4100. (On Time performance: 84 - Average Delay: 9 minutes)
- Flight Number: DL4132. (On Time performance: 97 - Average Delay: 1 minutes)

Southwest Airlines
- Flight Number: WN1080. (On Time performance: 78 - Average Delay: 9 minutes)
- Flight Number: WN1097. (On Time performance: 88 - Average Delay: 3 minutes)
- Flight Number: WN1910. (On Time performance: 23 - Average Delay: 40 minutes)
- Flight Number: WN3632. (On Time performance: 100 - Average Delay: 1 minutes)
- Flight Number: WN3705. (On Time performance: 57 - Average Delay: 23 minutes)
- Flight Number: WN4195. (On Time performance: 100 - Average Delay: 1 minutes)
- Flight Number: WN4982. (On Time performance: 40 - Average Delay: 18 minutes)

It is not possible to calculate the On-Time Performance for this flight accurately due to insufficient or non-representative data, as doing so could lead to misleading conclusions.

Delays analyzed by Week: It is not possible to calculate the On-Time Performance for this flight accurately by weekday due to insufficient or non-representative data, as doing so could lead to misleading conclusions
Delays analyzed by Month: We have gathered available data from last twelve closed months, spanning from June 02, 2025 to October 03, 2025. Next, you can observe the results broken down by month: number of flights analyzed, on-time performance per month, and average delay per month.

Note: We have excluded some months from the graph, since the quantity and quality of the data is not representative enough.