How often is UA3997 on time?

Across 20 flights on IAD → LGA from 2026-02-12 to 2026-03-28, UA3997 arrived within 15 minutes of schedule 89% of the time. The median arrival delay was -7 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

• UA3997 on IAD → IND (58 flights)
• UA3997 on IAD → BUF (1 flights)
• UA3997 on IAD → SAT (3 flights)
• UA3997 on BTV → IAD (31 flights)
• UA3997 on BTR → IAH (1 flights)
• UA3997 on CLE → IAH (19 flights)
• UA3997 on CMH → IAD (5 flights)
• UA3997 on ATL → IAH (18 flights)
• UA3997 on CRP → IAH (50 flights)
• UA3997 on IAH → SDF (31 flights)

Related

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