WN4021 Southwest Airlines - Flight Status

Which is the frequency of flight WN4021?
The flight WN4021 is scheduled to flight on Tuesday, Wednesday, Thursday, Friday, Saturday on a weekly basis.

Which is the distance of flight WN4021?
The distance between the two airports is 651 miles.

Are the departure airport and arrival airport at the same Time Zone?
No, each airport is in a different timezone. The times shown above, are presented in the local time of each respective airport.
Current Time in San Francisco: 2026-01-10 01:21:42
Current Time in Phoenix: 2026-01-10 02:21:42

The following airlines serves the same route between San Francisco and Phoenix:

American Airlines
- Flight Number: AA1930. (On Time performance: 68 - Average Delay: 24 minutes)
- Flight Number: AA2114. (On Time performance: 56 - Average Delay: 32 minutes)
- Flight Number: AA2411. (On Time performance: 78 - Average Delay: 50 minutes)
- Flight Number: AA2664. (On Time performance: 67 - Average Delay: 19 minutes)
- Flight Number: AA6404. (On Time performance: 96 - Average Delay: 3 minutes)

Alaska Airlines
- Flight Number: AS3008. (On Time performance: 94 - Average Delay: 20 minutes)
- Flight Number: AS3303. (On Time performance: 44 - Average Delay: 36 minutes)

Frontier Airlines
- Flight Number: F92638. (On Time performance: 43 - Average Delay: 56 minutes)

United Airlines
- Flight Number: UA1074.
- Flight Number: UA1375. (On Time performance: 75 - Average Delay: 18 minutes)
- Flight Number: UA1561. (On Time performance: 76 - Average Delay: 19 minutes)
- Flight Number: UA2115. (On Time performance: 81 - Average Delay: 8 minutes)
- Flight Number: UA2374. (On Time performance: 93 - Average Delay: 4 minutes)
- Flight Number: UA2376. (On Time performance: 51 - Average Delay: 26 minutes)
- Flight Number: UA2441. (On Time performance: 69 - Average Delay: 24 minutes)
- Flight Number: UA369. (On Time performance: 100 - Average Delay: 2 minutes)
- Flight Number: UA520.

Southwest Airlines
- Flight Number: WN1331. (On Time performance: 43 - Average Delay: 28 minutes)
- Flight Number: WN1422. (On Time performance: 65 - Average Delay: 22 minutes)
- Flight Number: WN1687. (On Time performance: 36 - Average Delay: 53 minutes)
- Flight Number: WN2869.
- Flight Number: WN4022.
- Flight Number: WN4106. (On Time performance: 66 - Average Delay: 25 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 March 06, 2025 to November 29, 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.