🇺🇸 ONT
Ontario
958 mi
SEA 🇺🇸
Seattle

Ontario to Seattle Flights

Ontario International Airport Seattle–Tacoma International Airport 3 airlines

Get Notified About Route Changes

Track up to 3 airports free. Weekly alerts when airlines add or remove routes.

Sign Up Free

The Ontario to Seattle route connects Ontario International Airport (ONT) in US with Seattle–Tacoma International Airport (SEA) in US. This short-haul flight covers approximately 958 miles (1542 km) with a typical flight time of 2h 10m. This route is served by 3 airlines: Alaska Airlines, SkyWest, Frontier. AirportRoutes has tracked 11 unique flight numbers on this route.

Search tickets for this route

Compare flight prices across hundreds of booking sites

Search ONT → SEA flights

Opens a live price search — just pick your dates

Departure Airport

Ontario International Airport

ICAO Code:
KONT
IATA Code:
ONT
City:
🇺🇸 Ontario
Country:
US
Elevation:
944 ft

Destination Airport

Seattle–Tacoma International Airport

ICAO Code:
KSEA
IATA Code:
SEA
City:
🇺🇸 Seattle
Country:
US
Elevation:
433 ft

3

Operators

11

Tracked Flights

958

Miles

2h 10m

Flight Duration

Route Map

Operating Airlines

Airline ICAO IATA
Alaska Airlines ASA AS
SkyWest SKW OO
Frontier FFT F9

Flight Schedule Pattern

Day Flights Observed Frequency Activity
Monday 13 12%
Tuesday 14 13%
Wednesday 13 12%
Thursday 23 21%
Friday 13 12%
Saturday 12 11%
Sunday 20 19%

Pattern Analysis

11 Tracked Flights:
Data Points: 108
API observations used to build this analysis
Weekdays: 76 flights
Weekend: 32 flights
Business Route More active on weekdays

All Flight Routes

3 Routes
Note: This table shows aggregated route data by airline. Each airline may operate multiple daily flights at different times. See the "Spotted Departure Times" section below for all observed departure times.
Airline Flight Numbers Aircraft Type Typical Time Days Active Last Seen Status
B739 19:41 7:41 PM (Representative)
M T W T F S S
Jun 22, 2026 Active
Frontier
FFT / F9
- A20N -
M T W T F S S
Jun 20, 2026 Active
SkyWest
SKW / OO
E75L 17:50 5:50 PM (Representative)
M T W T F S S
Jun 20, 2026 Active
Total Routes: 3
Active Routes: 3
Unique Airlines: 3
Aircraft Types: 3

Spotted Departure Times

Departure Time Operator ICAO IATA
17:50 5:50 PM SkyWest SKW OO
19:41 7:41 PM Alaska Airlines ASA AS

Time Information

Times are shown in the departure airport's local timezone (KONT - America/Los_Angeles).

Total Departure Times: 2
Time Range:
17:50 - 19:41
These are typical departure times observed from actual flights. Times may vary by season and schedule changes.