How often is WN1221 on time?

Across 23 flights on DEN → BOI from 2026-03-05 to 2026-04-06, WN1221 arrived within 15 minutes of schedule 68% of the time. The median arrival delay was +5 min, and the worst 10% of flights arrived +41 min or later. 4% 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

• WN1221 on LAS → SAT (11 flights)
• WN1221 on SAN → LAS (7 flights)
• WN1221 on LAS → RNO (12 flights)
• WN1221 on BOS → DEN (4 flights)
• WN1221 on BWI → BOS (4 flights)
• WN1221 on LGB → LAS (4 flights)
• WN1221 on PHX → SAT (42 flights)
• WN1221 on MCO → STL (16 flights)
• WN1221 on FLL → MKE (10 flights)
• WN1221 on MKE → LAS (5 flights)
• WN1221 on ELP → LAX (50 flights)
• WN1221 on DAL → ELP (30 flights)
• WN1221 on AUS → DAL (14 flights)
• WN1221 on PHX → AUS (14 flights)
• WN1221 on MSY → TPA (31 flights)
• WN1221 on BNA → MSY (17 flights)
• WN1221 on DAL → MSY (13 flights)
• WN1221 on ELP → DAL (18 flights)
• WN1221 on DAL → IND (5 flights)
• WN1221 on DEN → BWI (27 flights)
• WN1221 on BWI → PBI (4 flights)
• WN1221 on HOU → MSY (1 flights)
• WN1221 on DAL → MCO (1 flights)
• WN1221 on RSW → BWI (31 flights)
• WN1221 on BWI → BDL (5 flights)
• WN1221 on BWI → STL (8 flights)
• WN1221 on MCO → MKE (57 flights)
• WN1221 on DEN → AUS (29 flights)

Related

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