Direct (non-stop) flights from SeaTac (SEA) to Ontario (ONT)
Find comprehensive flight information, schedules, and booking details for direct flights from SeaTac (SEA) to Ontario (ONT). This popular route is operated by 3 airlines, offering multiple daily departures.• Flight Duration: 2h 31m - 2h 51m (average flight time)• Distance: 962 miles (1548 km) (air miles between airports)• Daily Flights: 5-9 flights (scheduled departures per day)
SeaTac (SEA)
Ontario (ONT)
FLIGHT TIME
2h 31m - 2h 51m
FLIGHT DISTANCE
962 miles (1548 km)
2h 32m - 2h 51m
07:15
21:25
962 miles (1548 km)
May
3 (Show)
68
Flight Schedule
December 2025
Airlines with direct flights from SeaTac (SEA) to Ontario (ONT)
Route Insights
Duration variability: Flight duration on this route can vary based on aircraft type, wind conditions, and airline scheduling. Average duration is 2h 31m - 2h 51m.
Pricing patterns: May typically offers lower prices due to reduced demand outside peak travel seasons.
Best departure times: Peak departure times are 14:00, 7:00, 8:00, offering more flight options and potentially better connections.
SeaTac (SEA) - Ontario (ONT) flight price statistics
$254
ApproximateThe numbers are average prices found based on user searches for direct flights between the airports. It's calculated from the cheapest prices found per month for a round-trip with 1 adult and can vary depending on the amount of data we have for this particular route.
$196
Jan$433
Feb$214
Mar$158
Apr$157
May$418
Jun$348
Jul$258
Aug$198
Sep$218
Oct$214
Nov$238
DecRelated Information
Airports: SEA • ONT Airport
Airlines operating this route: Alaska Airlines (AS), Delta Air Lines, Frontier Airlines
Frequently Asked Questions
How many flights operate from SEA to ONT?
There are 8 direct flights operating from SEA to ONT. Approximately 5-9 flights daily.
Which airlines operate flights from SEA to ONT?
3 airlines operate on this route: Alaska Airlines, Delta Air Lines, Frontier Airlines.
How long is the flight from SEA to ONT?
The flight duration from SEA to ONT is approximately 2h 31m - 2h 51m.
What is the distance from SEA to ONT?
The distance from SEA to ONT is 962 miles (1548 km).
What is the flight time range for this route?
Flight times on this route range from 2h 32m - 2h 51m.
What are the earliest and latest flight departure times?
The earliest flight departs at 07:15 and the latest flight departs at 21:25.
What is the cheapest month to fly from SEA to ONT?
May is typically the cheapest month to fly on this route.
How many flights operate per week on this route?
Approximately 68 flights operate per week from SEA to ONT.
What types of aircraft operate on this route?
This route is served by Boeing 737-900 (winglets) Passenger/BBJ3, Embraer 175 (Enhanced Winglets), Boeing 737MAX 9 Passenger, Airbus A321, Boeing 737-800 (winglets) Passenger/BBJ2.
What is the average flight price from SEA to ONT?
The average flight price for a round-trip ticket from SEA to ONT is approximately $254 USD. Prices can vary based on booking time, season, and airline.
When is the best time to book flights from SEA to ONT for the lowest prices?
May is typically the cheapest month to fly from SEA to ONT. Booking in advance and avoiding peak travel seasons can help you find better deals.
How many airlines offer flights from SEA to ONT?
3 airlines offer direct flights from SEA to ONT, providing travelers with multiple options for scheduling and pricing.
How far is ONT from SEA?
The distance from SEA to ONT is 962 miles (1548 km). This is a long-haul flight route.
How long does it take to fly from SEA to ONT?
The flight time from SEA to ONT is approximately 2h 31m - 2h 51m. Actual flight duration may vary based on weather conditions, aircraft type, and routing.