Travelers have found it’s best to book a flight 61 days in advance to save up to 36% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 61 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Seattle to Ontario 1-2 weeks in advance for as low as $306, or $373 for flights within the next 24 hours.
Our data shows that September tends to be the cheapest month to fly to Ontario from Seattle. Users have commonly found prices around $286 for the month, but tickets can be as low as $137. Due to multiple factors, prepare for potentially higher prices in November.