Seattle, WA → Ontario, CA flight delays
SEA → ONT · all airlines · 200 flights · April 2026 · source: US BTS
This route is delayed
11%of the time, by +54 min on average when it does.
This is history, not a promise — your specific flight could well be on time.
On-time rate
89%
Delayed 3h+
0%
Cancelled
0%
Avg when late
+54m
Best & worst day to fly
Most on-time
Saturday
delayed 4%
Worst
Tuesday
delayed 15%
Which airline is most punctual on SEA → ONT?
SkyWestdelayed 9%
Alaskadelayed 12%
Frequently asked
How often is the Seattle, WA to Ontario, CA flight delayed?
About 11% of SEA → ONT flights arrive late (15+ minutes), by an average of 54 minutes when they do, based on 200 flights in April 2026.
Which airline is most punctual on SEA → ONT?
SkyWest, delayed 9% of the time — the best of the 2 airlines flying this route.
What is the best day to fly SEA → ONT?
Saturday is the most on-time (delayed 4%), while Tuesday is the worst (delayed 15%).
Airport overviews