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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 07:30 to 21:20 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 Sep 21, 2026
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Airlines with non-stop routes:

Alaska Airlines oneworld

Departure times vary between 07:30 and 21:20
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 08:20 and 20:11
S
M
T
W
T
F
S
Sun
Mon
Tue
Wed
Thu
Fri
Sat
20 flights/week
20 flights/week

Frontier Airlines Low-cost carrier

Departure times vary between 10:03 and 18:49
S
M
T
W
T
F
S
Sun
Mon
Tue
Wed
Thu
Fri
Sat
6 flights/week
6 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
Oct 19
Tue
Oct 20
Wed
Oct 21
Thu
Oct 22
Fri
Oct 23
Sat
Oct 24
Sun
Oct 25
AS476
07:30
07:30
07:30
07:30
07:30
07:30
07:30
AS571
10:31
10:31
10:31
10:31
10:31
10:31
10:31
AS592
15:28
15:28
15:28
15:28
15:28
15:28
15:28
AS489
21:06
----
----
21:06
21:06
----
21:06

The timetable & schedule information was updated at 2026-09-21

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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
Oct 19
Tue
Oct 20
Wed
Oct 21
Thu
Oct 22
Fri
Oct 23
Sat
Oct 24
Sun
Oct 25
DL4070
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
19:56
19:56
19:56
19:56
19:56
19:56
19:56

The timetable & schedule information was updated at 2026-09-21

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
Oct 19
Tue
Oct 20
Wed
Oct 21
Thu
Oct 22
Fri
Oct 23
Sat
Oct 24
Sun
Oct 25
F92276
10:53
----
----
10:03
10:53
----
10:03

The timetable & schedule information was updated at 2026-09-21

RETURN SCHEDULE
CHECK PRICES
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Seattle to Ontario scheduled departures

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

Saturday
Sat
Oct 17
5 flights(5)
Sunday
Sun
Oct 18
8 flights(8)
Monday
Mon
Oct 19
8 flights(8)
Tuesday
Tue
Oct 20
6 flights(6)
Wednesday
Wed
Oct 21
6 flights(6)
Thursday
Thu
Oct 22
8 flights(8)
Friday
Fri
Oct 23
8 flights(8)
Time
Airline
Flight
07:30
Alaska Airlines Alaska Airlines
AS476
10:31
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
15:28
Alaska Airlines Alaska Airlines
AS592
19:56
Delta Air Lines Delta Air Lines
DL3987
07:30
Alaska Airlines Alaska Airlines
AS476
08:25
Delta Air Lines Delta Air Lines
DL4070
10:03
Frontier Airlines Frontier Airlines
F92276
10:31
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
15:28
Alaska Airlines Alaska Airlines
AS592
19:56
Delta Air Lines Delta Air Lines
DL3987
21:06
Alaska Airlines Alaska Airlines
AS489
07:30
Alaska Airlines Alaska Airlines
AS476
08:25
Delta Air Lines Delta Air Lines
DL4070
10:31
Alaska Airlines Alaska Airlines
AS571
10:53
Frontier Airlines Frontier Airlines
F92276
14:30
Delta Air Lines Delta Air Lines
DL4031
15:28
Alaska Airlines Alaska Airlines
AS592
19:56
Delta Air Lines Delta Air Lines
DL3987
21:06
Alaska Airlines Alaska Airlines
AS489
07:30
Alaska Airlines Alaska Airlines
AS476
08:25
Delta Air Lines Delta Air Lines
DL4070
10:31
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
15:28
Alaska Airlines Alaska Airlines
AS592
19:56
Delta Air Lines Delta Air Lines
DL3987
07:30
Alaska Airlines Alaska Airlines
AS476
08:25
Delta Air Lines Delta Air Lines
DL4070
10:31
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
15:28
Alaska Airlines Alaska Airlines
AS592
19:56
Delta Air Lines Delta Air Lines
DL3987
07:30
Alaska Airlines Alaska Airlines
AS476
08:25
Delta Air Lines Delta Air Lines
DL4070
10:03
Frontier Airlines Frontier Airlines
F92276
10:31
Alaska Airlines Alaska Airlines
AS571
14:30
Delta Air Lines Delta Air Lines
DL4031
15:28
Alaska Airlines Alaska Airlines
AS592
19:56
Delta Air Lines Delta Air Lines
DL3987
21:06
Alaska Airlines Alaska Airlines
AS489
07:30
Alaska Airlines Alaska Airlines
AS476
08:25
Delta Air Lines Delta Air Lines
DL4070
10:31
Alaska Airlines Alaska Airlines
AS571
10:53
Frontier Airlines Frontier Airlines
F92276
14:30
Delta Air Lines Delta Air Lines
DL4031
15:28
Alaska Airlines Alaska Airlines
AS592
19:56
Delta Air Lines Delta Air Lines
DL3987
21:06
Alaska Airlines Alaska Airlines
AS489
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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
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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 737-900 (winglets) Passenger/BBJ3, Boeing 737-800 (winglets) Passenger/BBJ2, Boeing 737MAX 8 Passenger, Boeing 737MAX 9 Passenger and Boeing 737-700 Passenger
    Delta Air Lines: Embraer 175 (Enhanced Winglets) and Airbus A220-300
    Frontier Airlines: Airbus A320neo and Airbus A321neo

Route FAQ

Alaska Airlines, Delta Air Lines and Frontier Airlines operate non-stop flights from SEA to ONT with 51 weekly departures.

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 are currently scheduled on this route, with published departure times ranging from 07:30 to 21:20 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.
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