Which airport are you flying from?

Direct flights from Seattle to Ontario

Airlines Schedules

SEA - ONT route map All flights from SEA to ONT non-stop. There are direct flights from Seattle Tacoma International (SEA), Washington, USA to Ontario International Airport (ONT), California, USA with Alaska Airlines, Delta Air Lines and Frontier Airlines. 51 weekly departures are currently scheduled on this route. Departure times range from 08:00 to 21:23 depending on the schedule period. The flight distance is 962 miles (1548 km). Flight time ranges from 2 hours and 32 minutes to 2 hours and 54 minutes.

SEA
Seattle Tacoma
USASeattle , USA
ONT
Ontario Airport
USAOntario , USA
SEA
Seattle Tacoma
USASeattle , USA
Ontario Airport
USAOntario , USA
ONT
Flight time 2h 32min to 2h 54min
Updated Nov 9, 2026
CHANGE DIRECTION

Airlines with non-stop routes:

Alaska Airlines oneworld

Departure times vary between 08:00 and 21:23
S
M
T
W
T
F
S
Sun
Mon
Tue
Wed
Thu
Fri
Sat
25 flights/week
25 flights/week

Delta Air Lines SkyTeam

Departure times vary between 08:25 and 20:11
S
M
T
W
T
F
S
Sun
Mon
Tue
Wed
Thu
Fri
Sat
21 flights/week
21 flights/week

Frontier Airlines Low-cost carrier

Departure times vary between 10:18 and 10:50
Ends in Nov 2026
Ends in Nov 2026
5 flights/week
Weekday-labels: HAS FLIGHTS UPCOMING NO FLIGHTS
View all flight dates
Flight schedule from Seattle to Ontario with Alaska Airlines

This is a weekly direct flight schedule for Alaska Airlines. Use the arrows or click on the date to change week. Click on any flight departure time to show more information and check availability.

 
Flight
Mon
Nov 16
Tue
Nov 17
Wed
Nov 18
Thu
Nov 19
Fri
Nov 20
Sat
Nov 21
Sun
Nov 22
AS575
08:34
08:34
08:34
08:29
08:34
08:34
08:34
AS571
12:31
12:31
12:31
12:31
12:30
12:30
12:30
AS594
15:41
15:41
15:41
15:41
17:28
----
17:28
AS489
20:31
----
----
20:31
20:58
20:58
20:58

The timetable & schedule information was updated at 2026-11-09

RETURN SCHEDULE
CHECK PRICES
Flight schedule from Seattle to Ontario with Delta Air Lines

This is a weekly direct flight schedule for Delta Air Lines. Use the arrows or click on the date to change week. Click on any flight departure time to show more information and check availability.

 
Flight
Mon
Nov 16
Tue
Nov 17
Wed
Nov 18
Thu
Nov 19
Fri
Nov 20
Sat
Nov 21
Sun
Nov 22
DL4070
08:25
08:25
08:25
08:25
08:25
08:25
08:25
DL4031
14:30
14:30
14:30
14:30
14:30
14:30
14:30
DL3987
20:11
20:11
20:11
20:11
20:11
20:11
20:11

The timetable & schedule information was updated at 2026-11-09

RETURN SCHEDULE
CHECK PRICES
Flight schedule from Seattle to Ontario with Frontier Airlines

This is a weekly direct flight schedule for Frontier Airlines. Use the arrows or click on the date to change week. Click on any flight departure time to show more information and check availability.

 
Flight
Mon
Nov 16
Tue
Nov 17
Wed
Nov 18
Thu
Nov 19
Fri
Nov 20
Sat
Nov 21
Sun
Nov 22
F92276
10:50
----
----
10:50
10:18
10:18
10:18

The timetable & schedule information was updated at 2026-11-09

RETURN SCHEDULE
CHECK PRICES
SPONSORED AD

Seattle to Ontario scheduled departures

Select a date to see every published non-stop departure between SEA and ONT.

Saturday
Sat
Dec 05
4 flights(4)
Sunday
Sun
Dec 06
6 flights(6)
Monday
Mon
Dec 07
6 flights(6)
Tuesday
Tue
Dec 08
5 flights(5)
Wednesday
Wed
Dec 09
5 flights(5)
Thursday
Thu
Dec 10
6 flights(6)
Friday
Fri
Dec 11
6 flights(6)
Time
Airline
Flight
08:37
Alaska Airlines Alaska Airlines
AS677
13:33
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
20:11
Delta Air Lines Delta Air Lines
DL3987
08:25
Delta Air Lines Delta Air Lines
DL4070
08:37
Alaska Airlines Alaska Airlines
AS677
13:33
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
20:11
Delta Air Lines Delta Air Lines
DL3987
20:22
Alaska Airlines Alaska Airlines
AS489
08:25
Delta Air Lines Delta Air Lines
DL4070
08:37
Alaska Airlines Alaska Airlines
AS677
13:33
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
20:11
Delta Air Lines Delta Air Lines
DL3987
20:22
Alaska Airlines Alaska Airlines
AS489
08:25
Delta Air Lines Delta Air Lines
DL4070
08:37
Alaska Airlines Alaska Airlines
AS677
13:33
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
20:11
Delta Air Lines Delta Air Lines
DL3987
08:25
Delta Air Lines Delta Air Lines
DL4070
08:37
Alaska Airlines Alaska Airlines
AS677
13:33
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
20:11
Delta Air Lines Delta Air Lines
DL3987
08:25
Delta Air Lines Delta Air Lines
DL4070
08:37
Alaska Airlines Alaska Airlines
AS677
13:33
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
20:11
Delta Air Lines Delta Air Lines
DL3987
20:22
Alaska Airlines Alaska Airlines
AS489
08:25
Delta Air Lines Delta Air Lines
DL4070
08:37
Alaska Airlines Alaska Airlines
AS677
13:33
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
20:11
Delta Air Lines Delta Air Lines
DL3987
20:22
Alaska Airlines Alaska Airlines
AS489
SPONSORED AD
SEA-ONT flight route
Route map from Seattle, SEA to Ontario, ONT. The distance is 962 miles or 1548 km.
Seattle - Ontario direct flight map
SPONSORED AD
SPONSORED AD

SEA - ONT route facts

  • Distance
    962 miles (1548 km)
  • Flight time
    2 hours and 32 minutes to 2 hours and 54 minutes
  • Airlines
    Alaska Airlines Alaska Airlines
    Delta Delta
    Frontier Frontier
  • Airline alliances
    oneworld SkyTeam Low-cost carrier
  • Cabins
    Economy Business First
  • Hub airports
    Alaska Airlines: SEA (Primary hub.)
    Delta Air Lines: SEA
  • Arrival terminals
    Alaska Airlines: Terminal 2
    Delta Air Lines: Terminal 2
  • Aircraft
    Alaska Airlines: Boeing 737-700 Passenger, Boeing 737MAX 9 Passenger, Boeing 737-900 (winglets) Passenger/BBJ3, Boeing 737-800 (winglets) Passenger/BBJ2 and Boeing 737MAX 8 Passenger
    Delta Air Lines: Airbus A220-300 and Embraer 175 (Enhanced Winglets)
    Frontier Airlines: Airbus A321neo and Airbus A320neo

Route FAQ

Alaska Airlines, Delta Air Lines and Frontier Airlines operate non-stop flights from SEA to ONT with 51 weekly departures (Nov 16 – Nov 22, 2026).

Scheduled flight time from SEA to ONT ranges from 2 hours and 32 minutes to 2 hours and 54 minutes. The route covers 962 miles (1548 km).

51 weekly departures (Nov 16 – Nov 22, 2026) are currently scheduled on this route, with published departure times ranging from 08:00 to 21:23 depending on the schedule period.

Arrival terminals: Alaska Airlines: Terminal 2 and Delta Air Lines: Terminal 2.

Economy, Business and First are currently scheduled on non-stop flights for this route.
Direct flights from Seattle to CA, USA
From Seattle to San Diego

SAN San Diego International Airport
From Seattle to Santa Ana

SNA John Wayne Arpt Orange Co
From Seattle to Los Angeles

LAX Los Angeles International
From Seattle to Palm Springs

PSP Palm Springs International
From Seattle to Long Beach

LGB Long Beach
From Seattle to Burbank

BUR Burbank Glendale Pasadena
From Seattle to Santa Barbara

SBA Santa Barbara Muni
From Seattle to San Luis Obispo

SBP San Luis County Regional Airport
From Seattle to Monterey

MRY Monterey Peninsula
From Seattle to Fresno

FAT Fresno Yosemite International
SPONSORED AD
SPONSORED AD