C$ 175 Find Cheap Flights from Seattle to Ontario – Compare and Save

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

• Earliest: departs at 8:00 am and lands at 10:43 am
• Latest: departs at 9:23 pm and lands at 12:06 am.

The flight takes about 2h 43m.

Only Economy Class is available on flights from Seattle to Ontario.

A direct flight from Seattle to Ontario takes 2h 43m, covering 2,477 km.

No, a passport is not required for this domestic route, but you will need another form of identification, such as a driver's licence.

Round-trip flights from Seattle to Ontario range from C$ 298 to C$ 559, with an average of C$ 426 over the past 12 months. Anything below C$ 298 counts as a good deal.

Last-minute fares on this route (booked within two weeks of departure) run 37% above the C$ 426 route average. Book 15 weeks before departure for the lowest fares.

On this route, direct and layover fares are close on average, with direct at C$ 428 round-trip and layover options via Las Vegas Harry Reid Intl (LAS) at C$ 412.

There is no standard. Checked bag policies vary by airline on this route. Most carriers charge C$ 49–C$ 141 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 A320neo variants.

Morning is the busiest departure period on Seattle to Ontario flights, with 34% leaving in that window. Afternoon departures account for 33%, Evening flights for 33%, 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 C$ 310 to C$ 1,638. That means the highest observed fare was about 5x higher than the lowest one.

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

• Alaska Airlines
• Delta

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 Seattle to Ontario are currently lower than usual. Average one-way flight prices are about C$ 187, which is 32% below the typical average for this route.

Ontario Airport (ONT) hosts 5 major car rental companies, with daily rates averaging C$ 85 for economy cars. Top options include:

• Fox
• Europcar
• Thrifty
• Alamo
• Dollar

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

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

• Denver Intl (DEN) – 40% of one-stop connections
• Sacramento Intl (SMF) – 33% of one-stop connections
• San Francisco (SFO) – 13% of one-stop connections
• Las Vegas Harry Reid Intl (LAS) – 7% of one-stop connections

Yes. Flexible dates can save you up to 24% on flights from Seattle to Ontario. Thursday is the cheapest departure day at C$ 391 round-trip on average, while Sunday is the most expensive at C$ 508, a difference of C$ 117.

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

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

• Alaska Airlines
• Delta
• Frontier

Flying via Portland (PDX) gives the shortest average 1-stop total travel time at 4h 36m, compared with 4h 41m via Sacramento Intl (SMF) and 4h 57m via San Francisco (SFO).

Ontario Convention Center is one of the most viewed places in Ontario on KAYAK.

Among airlines operating Seattle to Ontario flights:

• Frontier: offers free seat selection
• Alaska Airlines: 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 carry-on bag and a checked bag in Economy Class
• Delta: a carry-on bag and a checked bag in Economy Class
• Alaska Airlines: a carry-on bag and a checked bag in Business Class

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