San Francisco, CA → Boston, MA flight delays
SFO → BOS · all airlines · 439 flights · May 2026 · source: US BTS
This route is delayed
25%of the time, by +58 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
75%
Delayed 3h+
0.7%
Cancelled
0%
Avg when late
+58m
Best & worst day to fly
Most on-time
Saturday
delayed 12%
Worst
Thursday
delayed 40%
Which airline is most punctual on SFO → BOS?
Uniteddelayed 21%
JetBluedelayed 26%
Deltadelayed 29%
Frequently asked
How often is the San Francisco, CA to Boston, MA flight delayed?
About 25% of SFO → BOS flights arrive late (15+ minutes), by an average of 58 minutes when they do, based on 439 flights in May 2026.
Which airline is most punctual on SFO → BOS?
United, delayed 21% of the time — the best of the 3 airlines flying this route.
What is the best day to fly SFO → BOS?
Saturday is the most on-time (delayed 12%), while Thursday is the worst (delayed 40%).
Airport overviews