Delta Air Lines flights from Ontario, Los Angeles (ONT) to Seattle-Tacoma (SEA).

Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 07:00 Ontario, Los Angeles (ONT) 2 10:01 Seattle-Tacoma (SEA)
Delta Air Lines DL 1071 Non-stop Airbus A220-300 (223) 3:01 Effective 2026-04-13 through 2026-05-06
Daily 15:30 Ontario, Los Angeles (ONT) 2 18:33 Seattle-Tacoma (SEA)
Delta Air Lines DL 3697 Non-stop Embraer EMB 175 (E7W) 3:03 Effective 2026-02-12 through 2026-03-07
Daily 07:00 Ontario, Los Angeles (ONT) 2 10:01 Seattle-Tacoma (SEA)
Delta Air Lines DL 3816 Non-stop Embraer EMB 175 (E7W) 3:01 Effective 2026-05-07 through 2026-10-05
Daily 07:00 Ontario, Los Angeles (ONT) 2 10:05 Seattle-Tacoma (SEA)
Delta Air Lines DL 3816 Non-stop Embraer EMB 175 (E7W) 3:05 Effective from 2026-10-06
Daily 14:00 Ontario, Los Angeles (ONT) 2 17:00 Seattle-Tacoma (SEA)
Delta Air Lines DL 3819 Non-stop Embraer EMB 175 (E7W) 3:00 Effective from 2026-05-07
Mon,Tue,Fri-Sun 17:49 Ontario, Los Angeles (ONT) 2 20:49 Seattle-Tacoma (SEA)
Delta Air Lines DL 3834 Non-stop Embraer EMB 175 (E7W) 3:00 Valid until 2026-01-04
Daily 15:30 Ontario, Los Angeles (ONT) 2 18:35 Seattle-Tacoma (SEA)
Delta Air Lines DL 4031 Non-stop Embraer EMB 175 (E7W) 3:05 Effective 2026-01-05 through 2026-02-11
Daily 17:50 Ontario, Los Angeles (ONT) 2 20:50 Seattle-Tacoma (SEA)
Delta Air Lines DL 4031 Non-stop Embraer EMB 175 (E7W) 3:00 Effective from 2026-10-06
Daily 17:53 Ontario, Los Angeles (ONT) 2 20:50 Seattle-Tacoma (SEA)
Delta Air Lines DL 4031 Non-stop Embraer EMB 175 (E7W) 2:57 Effective 2026-03-08 through 2026-04-12
Daily 17:55 Ontario, Los Angeles (ONT) 2 20:50 Seattle-Tacoma (SEA)
Delta Air Lines DL 4031 Non-stop Embraer EMB 175 (E7W) 2:55 Effective 2026-04-13 through 2026-10-05
Daily 06:00 Ontario, Los Angeles (ONT) 2 08:55 Seattle-Tacoma (SEA)
Delta Air Lines DL 4042 Non-stop Embraer EMB 175 (E7W) 2:55 Effective 2026-03-08 through 2026-04-12
Daily 06:38 Ontario, Los Angeles (ONT) 2 09:45 Seattle-Tacoma (SEA)
Delta Air Lines DL 4042 Non-stop Embraer EMB 175 (E7W) 3:07 Valid until 2026-01-04
Daily 07:30 Ontario, Los Angeles (ONT) 2 10:36 Seattle-Tacoma (SEA)
Delta Air Lines DL 4042 Non-stop Embraer EMB 175 (E7W) 3:06 Effective 2026-01-05 through 2026-02-11
Daily 07:30 Ontario, Los Angeles (ONT) 2 10:34 Seattle-Tacoma (SEA)
Delta Air Lines DL 4042 Non-stop Embraer EMB 175 (E7W) 3:04 Effective 2026-02-12 through 2026-03-07
Mon,Tue,Fri-Sun 11:42 Ontario, Los Angeles (ONT) 2 14:45 Seattle-Tacoma (SEA)
Delta Air Lines DL 4070 Non-stop Embraer EMB 175 (E7W) 3:03 Valid until 2026-01-04
Daily 11:55 Ontario, Los Angeles (ONT) 2 14:56 Seattle-Tacoma (SEA)
Delta Air Lines DL 4070 Non-stop Embraer EMB 175 (E7W) 3:01 Effective 2026-04-13 through 2026-10-05
Daily 11:55 Ontario, Los Angeles (ONT) 2 14:58 Seattle-Tacoma (SEA)
Delta Air Lines DL 4070 Non-stop Embraer EMB 175 (E7W) 3:03 Effective from 2026-10-06
Daily 11:59 Ontario, Los Angeles (ONT) 2 14:53 Seattle-Tacoma (SEA)
Delta Air Lines DL 4070 Non-stop Embraer EMB 175 (E7W) 2:54 Effective 2026-03-08 through 2026-03-14
Daily 11:59 Ontario, Los Angeles (ONT) 2 14:55 Seattle-Tacoma (SEA)
Delta Air Lines DL 4070 Non-stop Embraer EMB 175 (E7W) 2:56 Effective 2026-03-15 through 2026-04-12
Wed,Thu 14:50 Ontario, Los Angeles (ONT) 2 17:50 Seattle-Tacoma (SEA)
Delta Air Lines DL 4070 Non-stop Embraer EMB 175 (E7W) 3:00 Valid until 2026-01-01




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Delta Air Lines flights from Ontario, Los Angeles (ONT) to Seattle-Tacoma (SEA).
Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Delta Air Lines DL1071
07:00
Ontario, Los Angeles (ONT) 2

10:01
Seattle-Tacoma (SEA)
Effective 2026-04-13 through 2026-05-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:01, non-stop
Airbus A220-300 (223)
Direct Flights:
Delta Air Lines DL3697
15:30
Ontario, Los Angeles (ONT) 2

18:33
Seattle-Tacoma (SEA)
Effective 2026-02-12 through 2026-03-07
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:03, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL3816
07:00
Ontario, Los Angeles (ONT) 2

10:01
Seattle-Tacoma (SEA)
Effective 2026-05-07 through 2026-10-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:01, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL3816
07:00
Ontario, Los Angeles (ONT) 2

10:05
Seattle-Tacoma (SEA)
Effective from 2026-10-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:05, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL3819
14:00
Ontario, Los Angeles (ONT) 2

17:00
Seattle-Tacoma (SEA)
Effective from 2026-05-07
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:00, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL3834
17:49
Ontario, Los Angeles (ONT) 2

20:49
Seattle-Tacoma (SEA)
Valid until 2026-01-04
Mon
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Duration: 3:00, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4031
15:30
Ontario, Los Angeles (ONT) 2

18:35
Seattle-Tacoma (SEA)
Effective 2026-01-05 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:05, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4031
17:50
Ontario, Los Angeles (ONT) 2

20:50
Seattle-Tacoma (SEA)
Effective from 2026-10-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:00, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4031
17:53
Ontario, Los Angeles (ONT) 2

20:50
Seattle-Tacoma (SEA)
Effective 2026-03-08 through 2026-04-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:57, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4031
17:55
Ontario, Los Angeles (ONT) 2

20:50
Seattle-Tacoma (SEA)
Effective 2026-04-13 through 2026-10-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:55, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4042
06:00
Ontario, Los Angeles (ONT) 2

08:55
Seattle-Tacoma (SEA)
Effective 2026-03-08 through 2026-04-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:55, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4042
06:38
Ontario, Los Angeles (ONT) 2

09:45
Seattle-Tacoma (SEA)
Valid until 2026-01-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:07, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4042
07:30
Ontario, Los Angeles (ONT) 2

10:36
Seattle-Tacoma (SEA)
Effective 2026-01-05 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:06, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4042
07:30
Ontario, Los Angeles (ONT) 2

10:34
Seattle-Tacoma (SEA)
Effective 2026-02-12 through 2026-03-07
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:04, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4070
11:42
Ontario, Los Angeles (ONT) 2

14:45
Seattle-Tacoma (SEA)
Valid until 2026-01-04
Mon
Tue
Wed
-
Thu
-
Fri
Sat
Sun
Duration: 3:03, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4070
11:55
Ontario, Los Angeles (ONT) 2

14:56
Seattle-Tacoma (SEA)
Effective 2026-04-13 through 2026-10-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:01, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4070
11:55
Ontario, Los Angeles (ONT) 2

14:58
Seattle-Tacoma (SEA)
Effective from 2026-10-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:03, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4070
11:59
Ontario, Los Angeles (ONT) 2

14:53
Seattle-Tacoma (SEA)
Effective 2026-03-08 through 2026-03-14
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:54, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4070
11:59
Ontario, Los Angeles (ONT) 2

14:55
Seattle-Tacoma (SEA)
Effective 2026-03-15 through 2026-04-12
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:56, non-stop
Embraer EMB 175 (E7W)
Direct Flights:
Delta Air Lines DL4070
14:50
Ontario, Los Angeles (ONT) 2

17:50
Seattle-Tacoma (SEA)
Valid until 2026-01-01
Mon
-
Tue
-
Wed
Thu
Fri
-
Sat
-
Sun
-
Duration: 3:00, non-stop
Embraer EMB 175 (E7W)
  • A domestic route departing from the Ontario, Los Angeles airport (ONT) and arriving at Seattle-Tacoma airport (SEA).
  • The flight distance is 956 miles, or 1539 km.
  • The timezone of both the departure and the arrival airports is UTC-8 . Current time at both airports is (loading...).
  • For direct flights, the flight time varies between 2:54 and 3:07.
All ONT-SEA flights
All Delta Air Lines flights
Return (SEA-ONT) flights
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