How often is UA551 on time?

Across 22 flights on STL → DEN from 2026-01-07 to 2026-02-11, UA551 arrived within 15 minutes of schedule 86% of the time. The median arrival delay was -4 min, and the worst 10% of flights arrived +18 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

• UA551 on LAX → BZN (21 flights)
• UA551 on SFO → IAD (1 flights)
• UA551 on LGA → ORD (6 flights)
• UA551 on DTW → SFO (19 flights)
• UA551 on DEN → PIT (16 flights)
• UA551 on DEN → LGA (31 flights)
• UA551 on SAT → DEN (36 flights)
• UA551 on ORD → DCA (1 flights)

Related

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