DL977 · SFO → BOS

Delta Air Lines · San Francisco to Boston · last 12 months · 230 flights tracked

56.6%on-time

DL977 SFO→BOS: 56.6% on-time over 230 flights (last 12 months) — below average. It trails the route average (74.5%) by 17.9 points. Best day to fly: Wed (61.8%); worst: Mon (45.9%). Seasonality matters: Jan is the most reliable month (72.7%), Apr the worst (33.3%). Cancellation rate is 1.7% — have a backup plan. Average arrival delay: 32.5 minutes.

Data: US BTS, last 12 months.

32.5 minavg arrival delay

1.7%cancelled

0diverted

230flights tracked

Arrival delay distribution

Early/on time · 931–60 min · 9861–180 min · 28180+ min · 7

On-time by day of week

Mon

45.9%

Tue

60.0%

Wed

61.8%

Thu

55.9%

Fri

58.3%

Sat

55.0%

Sun

60.0%

On-time by month

42.9%

Dec

72.7%

Jan

70.0%

Feb

70.4%

Mar

33.3%

Apr

61.3%

May

53.3%

Jun

48.4%

Jul

54.8%

Aug

← All flights on SFO–BOS