Boston, MA → San Francisco, CA flight delays
BOS → SFO · all airlines · 381 flights · April 2026 · source: US BTS
This route is delayed
30%of the time, by +55 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
70%
Delayed 3h+
1.6%
Cancelled
0.3%
Avg when late
+55m
Best & worst day to fly
Most on-time
Tuesday
delayed 15%
Worst
Thursday
delayed 40%
Which airline is most punctual on BOS → SFO?
Uniteddelayed 22%
Deltadelayed 33%
JetBluedelayed 39%
Frequently asked
How often is the Boston, MA to San Francisco, CA flight delayed?
About 30% of BOS → SFO flights arrive late (15+ minutes), by an average of 55 minutes when they do, based on 381 flights in April 2026.
Which airline is most punctual on BOS → SFO?
United, delayed 22% of the time — the best of the 3 airlines flying this route.
What is the best day to fly BOS → SFO?
Tuesday is the most on-time (delayed 15%), while Thursday is the worst (delayed 40%).
Airport overviews