How often is UA1183 on time?

Across 21 flights on IAD → BOS from 2026-02-12 to 2026-03-04, UA1183 arrived within 15 minutes of schedule 85% of the time. The median arrival delay was -3 min, and the worst 10% of flights arrived +18 min or later. 5% 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

• UA1183 on BOS → IAH (102 flights)
• UA1183 on IAH → DFW (28 flights)
• UA1183 on EWR → BOS (53 flights)
• UA1183 on IAH → LAS (96 flights)
• UA1183 on SNA → DEN (16 flights)
• UA1183 on DEN → GTF (105 flights)
• UA1183 on LGA → DEN (37 flights)
• UA1183 on EWR → CLT (49 flights)

Related

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