How often is UA1186 on time?

Across 34 flights on ORD → BOS from 2026-05-21 to 2026-06-30, UA1186 arrived within 15 minutes of schedule 91% of the time. The median arrival delay was -15 min, and the worst 10% of flights arrived +4 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

• UA1186 on SFO → DTW (1 flights)
• UA1186 on DEN → AVL (53 flights)
• UA1186 on EWR → SLC (24 flights)
• UA1186 on AUS → DEN (35 flights)
• UA1186 on CLE → TPA (42 flights)
• UA1186 on EWR → MIA (16 flights)
• UA1186 on DEN → TUL (31 flights)
• UA1186 on DEN → RNO (86 flights)
• UA1186 on RNO → SFO (18 flights)

Related

• All United Airlines flights on ORD → BOS
• Compare airlines on ORD → BOS
• United Airlines on the return, BOS → ORD