$76 Find Cheap Flights from Ontario to Seattle - Compare and Save

These are the earliest and latest flight times available from Ontario to Seattle:

• Earliest: departs at 6:00 am and lands at 8:55 am
• Latest: departs at 8:59 pm and lands at 11:54 pm.

The flight takes about 2h 55m.

Three cabin classes are available on flights from Ontario to Seattle:

• Economy Class
• Premium Economy Class
• First Class

A nonstop flight from Ontario to Seattle takes 2h 55m, covering 956 miles.

No, a passport is not required for this domestic route, but you will need a real ID-compliant driver's license, a state ID or another TSA-accepted form of identification.

Round-trip flights from Ontario to Seattle range from $195 to $362, with an average of $276 over the past 12 months. Anything below $195 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 44% above the $276 route average. Book 7 weeks before departure for the lowest fares.

On this route, layover flights are cheaper than nonstop options on average. Layover fares average $119 round-trip via Salt Lake City (SLC), compared to $278 for nonstop.

Delta is slightly above the route average for timely arrivals, while Alaska Airlines has a lower on-time arrival rate. On-time arrival rates on Ontario to Seattle flights are:

• Delta: 95% on time
• Alaska Airlines: 90% on time
• Frontier: 90% on time

Overall, flights on this route are punctual 92% of the time on average.

There is no standard. Checked-bag policies vary by airline on this route. Most carriers charge $35–$100 for the first checked bag in economy. Premium fares and elite-status bookings typically include a free checked bag.

The Boeing 737-800 Passenger/BBJ2 (winglets) family is used most often on this route, operated mainly by Alaska Airlines. Other aircraft seen on the route include Airbus A321neo variants.

Morning is the busiest departure period on Ontario to Seattle flights, with 58% of flights leaving in that window. Evening departures account for 28%, afternoon flights for 14%, and night flights for 0%.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $153 to $1,277. That means the highest observed fare was about 8x higher than the lowest one.

Three airlines offer in-flight Wi-Fi on Ontario to Seattle flights:

• Alaska Airlines
• Delta
• JetBlue

Pricing varies by airline and fare class. Some plans are included with the ticket or loyalty program; others are paid add-ons priced by flight length.

One-way fares from Ontario to Seattle are currently lower than usual. Average one-way flight prices are about $131, which is 29% below the typical average for this route.

Seattle/Tacoma Intl Airport (SEA) hosts 5 major car rental companies, with daily rates starting from around $4 for economy cars. Top options include:

• Fox
• Europcar
• Thrifty
• Budget
• Dollar

Flights from Ontario to Seattle usually depart from Ontario (ONT) and arrive at Seattle/Tacoma Intl (SEA).

Morning flights have the fewest delays on this route, while night departures tend to have the most.

A flight is considered delayed when it departs 15 minutes or more after its scheduled time. This is the standard used by the US Department of Transportation and most airline industry reporting. On the Ontario to Seattle route, 8% of flights were delayed in the past 3 months, with delays averaging 2h 12m.

One-stop flights from Ontario to Seattle most commonly connect through:

• Denver Intl (DEN) - 31% of one-stop connections
• Sacramento Intl (SMF) - 25% of one-stop connections
• Las Vegas Harry Reid Intl (LAS) - 20% of one-stop connections
• San Francisco (SFO) - 13% of one-stop connections

Yes. Flexible dates can save you up to 12% on flights from Ontario to Seattle. Tuesday is the cheapest departure day at $267 round-trip on average, while Sunday is the most expensive at $301, a difference of $34.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

3 airlines operate flights between Ontario and Seattle. The airlines offering nonstop flights on this route include:

• Alaska Airlines
• Delta
• Frontier

Flying via San Jose (SJC) gives the shortest average 1-stop total travel time at 4h 40m, compared with 4h 43m via Sacramento Intl (SMF) and 4h 46m via Oakland (OAK).

Some of the most popular sights in Seattle are Pike Place Market, Lumen Field and Space Needle. These are among the most viewed places in Seattle on KAYAK.

Among airlines operating Ontario to Seattle flights:

• Frontier: offers free seat selection
• Alaska Airlines: offers extra legroom; offers free seat selection
• Delta: offers extra legroom; offers free seat selection

Extra legroom and free seat selection availability depends on fare class and route.

Here are some options for this route, based on selected ticket types and cabin classes:

• Frontier: a cabin bag and a checked bag in Economy Class
• Alaska Airlines: a cabin bag and a checked bag in Economy Class
• Delta: a cabin bag and a checked bag in Economy Class

Bag allowance can vary by ticket type, cabin class, route and airline, so always check the fare details before booking.

If you plan to leave your car at the airport, Ontario International Airport has a variety of parking options ranging from Valet Parking to premium parking, long-term parking, and even economy parking. Parking Lots 3 and 4 offer the best long-term parking options as cars are charged by the day instead of hourly, as is the case for other parking lots. Parking Lot 3 is the most convenient as it is located close to Terminal 4 and Terminal 2. Parking Lot 5, on the other hand, is the furthest from the airport terminals but also the cheapest one. Anyone parking here can use the free airport shuttle to get to the terminals.

The bus is the most budget-friendly way to get from the city center to Ontario International Airport. They can be found at Holt @ Palm Eb Fs, where you’ll take the 61 bus. This bus goes directly to the airport, and you’ll be dropped off at Terminal Way 2 in less than 20min.

Seattle Tacoma Airport is equipped with special access facilities to provide travelers with a safe and easy way to get around the airport. For instance, points of access to all terminals, as well as other buildings within the airport, are fitted with ramps and escalators to make it easy for anyone in a wheelchair to get through. Similarly, all the toilets have an accessible stall for travelers with limited mobility.

If you’ve booked connecting flights, your layover will depend on the airline you’re flying with. Most airlines will stop at an airport that serves as their hub since it is cheaper and extremely convenient. For example, if you’re flying with Delta, you’re most likely to have a layover at Salt Lake City International Airport, the only hub for Delta Airlines on this route. Similarly, flights serviced by United Airlines are scheduled for a layover at San Francisco International Airport, which is a hub for the airline.