San Francisco, CA → Boston, MA flight delays
SFO → BOS · all airlines · 381 flights · April 2026 · source: US BTS
This route is delayed
23%of the time, by +49 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
77%
Delayed 3h+
0%
Cancelled
0.3%
Avg when late
+49m
Best & worst day to fly
Most on-time
Tuesday
delayed 12%
Worst
Thursday
delayed 35%
Which airline is most punctual on SFO → BOS?
Uniteddelayed 20%
JetBluedelayed 23%
Deltadelayed 30%
Frequently asked
How often is the San Francisco, CA to Boston, MA flight delayed?
About 23% of SFO → BOS flights arrive late (15+ minutes), by an average of 49 minutes when they do, based on 381 flights in April 2026.
Which airline is most punctual on SFO → BOS?
United, delayed 20% of the time — the best of the 3 airlines flying this route.
What is the best day to fly SFO → BOS?
Tuesday is the most on-time (delayed 12%), while Thursday is the worst (delayed 35%).
Airport overviews