Our flights from SEA to ONT
There are currently 23 direct flights between SEA to ONT each week, operated by 3 airlines.
You can catch a flight from SEA to ONT on any day of the week.
These airlines operate direct flights from SEA to ONT: Alaska Airlines, American Airlines, United Airlines.
The most common aircraft type flying between SEA to ONT is Airbus A321.
The day with the most flights from SEA to ONT is Monday.
Our cheapest flight from SEA to ONT was in September at just $143.