How often is UA3640 on time?

Across 20 flights on SDF → IAD from 2026-05-01 to 2026-05-20, UA3640 arrived within 15 minutes of schedule 100% of the time. The median arrival delay was -14 min, and the worst 10% of flights arrived -5 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

• UA3640 on ORD → ABQ (41 flights)
• UA3640 on RIC → ORD (1 flights)
• UA3640 on BUF → ORD (7 flights)
• UA3640 on MSN → ORD (16 flights)
• UA3640 on ROC → ORD (3 flights)
• UA3640 on ORD → PIT (3 flights)
• UA3640 on IAD → ROC (27 flights)
• UA3640 on EWR → EYW (18 flights)
• UA3640 on MSY → EWR (2 flights)
• UA3640 on MCI → ORD (6 flights)
• UA3640 on DTW → IAD (19 flights)
• UA3640 on CLT → EWR (2 flights)

Related

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