UA399 · ORD → BOS

United Airlines · Chicago O'Hare to Boston · last 12 months · 162 flights tracked

58.2%on-time

UA399 ORD→BOS: 58.2% on-time over 162 flights (last 12 months) — below average. It trails the route average (66.6%) by 8.4 points. Best day to fly: Sat (71.4%); worst: Mon (47.8%). Seasonality matters: Jan is the most reliable month (75.0%), Sep the worst (30.0%). Cancellation rate is 2.5% — have a backup plan. Average arrival delay: 30.0 minutes.

Data: US BTS, last 12 months.

30.0 minavg arrival delay

2.5%cancelled

0diverted

162flights tracked

Arrival delay distribution

Early/on time · 681–60 min · 6661–180 min · 19180+ min · 5

On-time by day of week

Mon

47.8%

Tue

69.6%

Wed

50.0%

Thu

65.2%

Fri

50.0%

Sat

71.4%

Sun

54.5%

On-time by month

30.0%

Sep

51.6%

Oct

71.4%

Nov

60.0%

Dec

75.0%

Jan

72.7%

Feb

← All flights on ORD–BOS