How often is WN421 on time?

Across 58 flights on COS → DEN from 2026-01-06 to 2026-03-04, WN421 arrived within 15 minutes of schedule 79% of the time. The median arrival delay was -17 min, and the worst 10% of flights arrived +45 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

• WN421 on MCO → BWI (7 flights)
• WN421 on BDL → BWI (12 flights)
• WN421 on ABQ → LAX (4 flights)
• WN421 on AUS → PHX (58 flights)
• WN421 on MCI → AUS (18 flights)
• WN421 on SAN → ABQ (23 flights)
• WN421 on SAN → DEN (5 flights)
• WN421 on DEN → SAT (5 flights)
• WN421 on ATL → MCO (18 flights)
• WN421 on DAL → MCO (29 flights)
• WN421 on LGB → PHX (1 flights)
• WN421 on OAK → LGB (1 flights)
• WN421 on PHX → DAL (1 flights)
• WN421 on LAS → SNA (1 flights)
• WN421 on ATL → IND (27 flights)
• WN421 on BZN → DEN (4 flights)
• WN421 on SFO → AUS (58 flights)
• WN421 on STL → SAV (24 flights)

Related

• All Southwest Airlines flights on COS → DEN
• Compare airlines on COS → DEN
• Southwest Airlines on the return, DEN → COS