How often is UA4039 on time?

Across 7 flights on IAH → AUS from 2026-03-07 to 2026-03-28, UA4039 arrived within 15 minutes of schedule 100% of the time. The median arrival delay was -1 min, and the worst 10% of flights arrived +1 min or later. 14% 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

• UA4039 on JAX → IAH (41 flights)
• UA4039 on IAH → JAX (1 flights)
• UA4039 on SLC → IAH (31 flights)
• UA4039 on IAD → PHL (1 flights)
• UA4039 on IAH → ICT (1 flights)
• UA4039 on MAF → IAH (1 flights)
• UA4039 on ATL → IAH (10 flights)
• UA4039 on IAH → MFE (10 flights)
• UA4039 on SDF → IAD (16 flights)
• UA4039 on CRP → IAH (13 flights)
• UA4039 on PHL → IAH (8 flights)

Related

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