How often is WN4021 on time?

Across 44 flights on SFO → PHX from 2026-01-06 to 2026-03-04, WN4021 arrived within 15 minutes of schedule 86% of the time. The median arrival delay was -13 min, and the worst 10% of flights arrived +24 min or later. 0% of flights were cancelled.

Delay distribution

Arrival delay for completed flights (excludes cancellations and diversions).

Performance by month

Performance by day of week

Other routes

• WN4021 on DEN → HOU (7 flights)
• WN4021 on DAL → LGA (12 flights)
• WN4021 on DEN → MKE (4 flights)
• WN4021 on FLL → BNA (4 flights)
• WN4021 on RNO → PHX (49 flights)
• WN4021 on HOU → LAS (2 flights)
• WN4021 on MHT → MDW (28 flights)
• WN4021 on MSY → MCO (1 flights)
• WN4021 on LAS → BUR (1 flights)
• WN4021 on SLC → PHX (1 flights)
• WN4021 on IND → BWI (1 flights)
• WN4021 on LAX → DAL (26 flights)
• WN4021 on DAL → MDW (5 flights)
• WN4021 on DAL → PHL (12 flights)
• WN4021 on PHX → DAL (4 flights)
• WN4021 on PHX → BUR (24 flights)
• WN4021 on MSY → TPA (35 flights)

Related

• All Southwest Airlines flights on SFO → PHX
• Compare airlines on SFO → PHX
• Southwest Airlines on the return, PHX → SFO