Air Canada flight AC 4423: San Francisco - Ontario, Los Angeles

Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
Daily 07:24 San Francisco (SFO) 3 09:03 Ontario, Los Angeles (ONT) 2
AC 4423 Non-stop Embraer EMB 175 (E7W) 1:39 Effective 2026-05-21 through 2026-08-09
Codeshare flight, operated by United Airlines.(UA 5740)
Daily 08:12 San Francisco (SFO) 3 09:43 Ontario, Los Angeles (ONT) 2
AC 4423 Non-stop Boeing 737-900 (739) 1:31 Effective 2026-04-30 through 2026-05-20
Codeshare flight, operated by United Airlines.(UA 1316)
Daily 08:15 San Francisco (SFO) 3 09:55 Ontario, Los Angeles (ONT) 2
AC 4423 Non-stop Embraer EMB 175 (E7W) 1:40 Effective 2026-03-29 through 2026-04-29
Codeshare flight, operated by United Airlines.(UA 5740)
Mon,Thu,Fri,Sun 11:10 San Francisco (SFO) 3 12:38 Ontario, Los Angeles (ONT) 2
AC 4423 Non-stop Boeing 737 MAX 9 (7M9) 1:28 Effective 2026-02-12 through 2026-02-22
Codeshare flight, operated by United Airlines.(UA 2661)
Sat 11:20 San Francisco (SFO) 3 12:47 Ontario, Los Angeles (ONT) 2
AC 4423 Non-stop Boeing 737 MAX 9 (7M9) 1:27 Effective 2026-02-14 through 2026-02-21
Codeshare flight, operated by United Airlines.(UA 2661)
Tue,Wed 11:20 San Francisco (SFO) 3 12:48 Ontario, Los Angeles (ONT) 2
AC 4423 Non-stop Boeing 737 MAX 8 (7M8) 1:28 Effective 2026-02-17 through 2026-02-18
Codeshare flight, operated by United Airlines.(UA 2661)
Mon 18:25 San Francisco (SFO) 3 19:54 Ontario, Los Angeles (ONT) 2
AC 4423 Non-stop Embraer EMB 175 (E7W) 1:29 Effective 2026-02-23 through 2026-03-02
Codeshare flight, operated by United Airlines.(UA 5443)
Fri 18:40 San Francisco (SFO) 3 20:07 Ontario, Los Angeles (ONT) 2
AC 4423 Non-stop Canadair CRJ 700 (CR7) 1:27 Operates only on 2026-02-27
Codeshare flight, operated by United Airlines.(UA 5443)


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Air Canada flight AC 4423:
San Francisco - Ontario, Los Angeles
Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
Air Canada AC4423
07:24
San Francisco (SFO) 3

09:03
Ontario, Los Angeles (ONT) 2
Effective 2026-05-21 through 2026-08-09
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 5740)
Duration: 1:39, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC4423
08:12
San Francisco (SFO) 3

09:43
Ontario, Los Angeles (ONT) 2
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1316)
Duration: 1:31, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC4423
08:15
San Francisco (SFO) 3

09:55
Ontario, Los Angeles (ONT) 2
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 5740)
Duration: 1:40, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC4423
11:10
San Francisco (SFO) 3

12:38
Ontario, Los Angeles (ONT) 2
Effective 2026-02-12 through 2026-02-22
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 2661)
Duration: 1:28, non-stop
Boeing 737 MAX 9 (7M9)
Direct Codeshare Flights:
Air Canada AC4423
11:20
San Francisco (SFO) 3

12:47
Ontario, Los Angeles (ONT) 2
Effective 2026-02-14 through 2026-02-21
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 2661)
Duration: 1:27, non-stop
Boeing 737 MAX 9 (7M9)
Direct Codeshare Flights:
Air Canada AC4423
11:20
San Francisco (SFO) 3

12:48
Ontario, Los Angeles (ONT) 2
Effective 2026-02-17 through 2026-02-18
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 2661)
Duration: 1:28, non-stop
Boeing 737 MAX 8 (7M8)
Direct Codeshare Flights:
Air Canada AC4423
18:25
San Francisco (SFO) 3

19:54
Ontario, Los Angeles (ONT) 2
Effective 2026-02-23 through 2026-03-02
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 5443)
Duration: 1:29, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC4423
18:40
San Francisco (SFO) 3

20:07
Ontario, Los Angeles (ONT) 2
Operates only on 2026-02-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 5443)
Duration: 1:27, non-stop
Canadair CRJ 700 (CR7)
  • AC 4423 is a domestic flight departing from the San Francisco airport (SFO) and arriving at Ontario, Los Angeles airport (ONT).
  • The flight distance is 363 miles, or 584 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 1:27 and 1:40.
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