$119 Find Cheap Flights from Seattle to Ontario - Compare and Save

You can use the sunflower lanyard program when you're departing from Seattle to Ontario and need assistance at the SEA airport. This program is available to passengers with hidden disabilities who need extra help with check-ins, security screening, and carrying luggage. If you'd like to use the service, you can request sunflower lanyards at the pre-security information desk, between checkpoints 3 and 4, or the post-security information desk in Concourse A.

Once you land in Ontario, you can use the pet relief areas inside and outside the terminals if your pet needs relief. The outside areas are at the far end of the terminal buildings. The areas inside are near gates 210 and 410. The relief areas have waste disposal bags and bins, which you can use to clean after your pet.

Ontario has a well-designed bus and rail transportation service. If you'd like public transport from ONT, you can use the public buses boarded at terminal 2. The buses are available every 20min.

The USO military lounge is a space for military members and their families to sit and relax. Families can access free internet services, entertainment, and food and drinks. The ONT USO lounge is across parking lot F.

In the last 5 days, the lowest price for a flight from Seattle to Ontario was $119 for a one-way ticket and $190 for a round-trip.

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Alaska Airlines, Delta, American Airlines, Hawaiian Airlines, and JetBlue offer inflight Wi-Fi service on the Seattle to Ontario flight route.

The Airbus A321neo is the aircraft model that flies most regularly on the Seattle to Ontario flight route.

SkyTeam, and oneworld are the airline alliances operating flights between Seattle and Ontario, with SkyTeam being the most commonly used for this route.

There are nonstop flights from Seattle to Ontario on a daily basis.

The two airlines most popular with KAYAK users for flights from Seattle to Ontario are Southwest and Alaska Airlines. With an average price for the route of $260 and an overall rating of 8.0, Southwest is the most popular choice. Alaska Airlines is also a great choice for the route, with an average price of $314 and an overall rating of 7.9.

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Ontario.

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to Seattle with another airline. Booking your flights between Seattle and ONT can sometimes prove cheaper using this method.

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Ontario from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.