Cheap flights from Ontario to Seattle from R1 465

The cheapest month to fly to Seattle from Ontario is in January. Flight prices, which tend to average around R3 194, are often lower during this time because this is during the off-season. If you aren’t able to travel to Seattle during the month of January, then flying in March is also cheap. Prices for this month can be found on momondo for an average of R3 869.

Fly from Ontario to Seattle/Tacoma Intl for the best Ontario - Seattle/Tacoma Intl flight prices

You are more likely to see cheaper flights to Seattle from Ontario when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around R4 426 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Ontario for as low as R3 589 on momondo.

There is only 1 cabin class available to choose from on Ontario to Seattle flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Historically, on average around 8% of flights between Ontario and Seattle have experienced a delay on any given week. The average delay length over the past 12 months has been 136 minutes.

Generally, flights departing in the morning tend to experience fewer delays. Flights departing at night have, in the past, seen delays more frequently in comparison.

Tuesday is statistically the day of the week that experiences the fewest delays on this flight route. Monday has historically seen more delays on average compared to the rest of the week.

According to our data, Delta have had the fewest delays on this route over the last 12 months, with about 5% of their flights experiencing any sort of delay.

16 flights are operational daily from Ontario to Seattle as of October 2026. The most popular departure time for this route is 6:00, with 69% of flights per day taking off at midday.

As of October 2026, 115 flights take off from Ontario and land in Seattle each week. The most common flight departure day for this route is Fri, with 19% of weekly flights taking off on this day.