How often is DL3949 on time?

Across 17 flights on IAD → DTW from 2026-01-05 to 2026-02-07, DL3949 arrived within 15 minutes of schedule 41% of the time. The median arrival delay was +22 min, and the worst 10% of flights arrived +119 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

• DL3949 on DTW → ELM (55 flights)
• DL3949 on BUF → DTW (21 flights)
• DL3949 on DTW → BUF (21 flights)
• DL3949 on ELM → DTW (36 flights)
• DL3949 on DTW → CMH (75 flights)
• DL3949 on FSD → MSP (20 flights)
• DL3949 on DTW → IAD (17 flights)
• DL3949 on ATL → SHV (16 flights)
• DL3949 on SHV → ATL (16 flights)
• DL3949 on CMH → DTW (54 flights)
• DL3949 on BIS → MSP (25 flights)
• DL3949 on MGM → ATL (41 flights)

Related

• All Delta Air Lines flights on IAD → DTW
• Compare airlines on IAD → DTW
• Delta Air Lines on the return, DTW → IAD