How often is UA4021 on time?

Across 25 flights on DFW → IAH from 2025-12-19 to 2026-03-02, UA4021 arrived within 15 minutes of schedule 96% of the time. The median arrival delay was -19 min, and the worst 10% of flights arrived -11 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

• UA4021 on MSP → IAH (10 flights)
• UA4021 on CMH → IAD (10 flights)
• UA4021 on IAD → BUF (1 flights)
• UA4021 on ATL → IAH (3 flights)
• UA4021 on IAH → ELP (32 flights)
• UA4021 on SDF → IAD (24 flights)
• UA4021 on EYW → IAD (37 flights)
• UA4021 on MSY → IAH (2 flights)
• UA4021 on CLE → IAH (45 flights)
• UA4021 on HRL → IAH (2 flights)
• UA4021 on IAH → MAF (1 flights)
• UA4021 on IAD → LGA (23 flights)
• UA4021 on IAD → CMH (8 flights)

Related

• All United Airlines flights on DFW → IAH
• Compare airlines on DFW → IAH
• United Airlines on the return, IAH → DFW