How often is UA1236 on time?

Across 46 flights on STL → DEN from 2026-02-12 to 2026-04-29, UA1236 arrived within 15 minutes of schedule 83% of the time. The median arrival delay was -3 min, and the worst 10% of flights arrived +40 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

• UA1236 on DEN → PHX (223 flights)
• UA1236 on SRQ → ORD (21 flights)
• UA1236 on PSP → DEN (3 flights)
• UA1236 on DEN → SNA (3 flights)
• UA1236 on SNA → DEN (37 flights)
• UA1236 on LGA → DEN (17 flights)
• UA1236 on ORD → LGA (8 flights)
• UA1236 on SFO → DFW (1 flights)
• UA1236 on ORD → MSP (1 flights)
• UA1236 on SLC → DEN (50 flights)
• UA1236 on PHX → DEN (29 flights)
• UA1236 on DEN → XNA (2 flights)
• UA1236 on MSY → DEN (22 flights)

Related

• All United Airlines flights on STL → DEN
• Compare airlines on STL → DEN
• United Airlines on the return, DEN → STL