How often is WN4138 on time?

Across 28 flights on SJC → ONT from 2026-03-05 to 2026-04-06, WN4138 arrived within 15 minutes of schedule 96% of the time. The median arrival delay was -12 min, and the worst 10% of flights arrived +7 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

• WN4138 on LAS → PHX (23 flights)
• WN4138 on SJC → SAN (58 flights)
• WN4138 on ABQ → DAL (15 flights)
• WN4138 on ONT → PHX (15 flights)
• WN4138 on PHX → ABQ (15 flights)
• WN4138 on BOI → SJC (5 flights)
• WN4138 on PHX → CMH (5 flights)
• WN4138 on ONT → LAS (8 flights)
• WN4138 on MCO → DEN (1 flights)
• WN4138 on BWI → MDW (1 flights)
• WN4138 on PHX → SNA (13 flights)
• WN4138 on DEN → PHX (16 flights)
• WN4138 on BUR → SMF (1 flights)
• WN4138 on SMF → SNA (27 flights)
• WN4138 on PDX → SMF (13 flights)
• WN4138 on PSP → DEN (31 flights)
• WN4138 on OAK → PSP (7 flights)
• WN4138 on ONT → OAK (30 flights)

Related

• All Southwest Airlines flights on SJC → ONT
• Compare airlines on SJC → ONT
• Southwest Airlines on the return, ONT → SJC