Air Canada flight AC 4912: Chicago O'Hare - Saint Louis

Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
Daily 07:00 Chicago O'Hare (ORD) 1 08:18 Saint Louis (STL) 1
AC 4912 Non-stop Airbus A319 (319) 1:18 Effective 2026-04-30 through 2026-05-20
Codeshare flight, operated by United Airlines.(UA 1955)
Daily 15:03 Chicago O'Hare (ORD) 2 16:26 Saint Louis (STL) 1
AC 4912 Non-stop Embraer EMB 175 (E7W) 1:23 Effective 2026-05-21 through 2026-10-24
Codeshare flight, operated by United Airlines.(UA 5214)
Daily 16:24 Chicago O'Hare (ORD) 2 17:54 Saint Louis (STL) 1
AC 4912 Non-stop Embraer EMB 175 (E7W) 1:30 Valid until 2026-01-04
Codeshare flight, operated by United Airlines.(UA 5873)
Mon,Wed,Fri,Sun 19:35 Chicago O'Hare (ORD) 1 21:03 Saint Louis (STL) 1
AC 4912 Non-stop Airbus A319 (319) 1:28 Effective 2026-03-29 through 2026-04-05
Codeshare flight, operated by United Airlines.(UA 485)
Mon,Tue,Sat 19:35 Chicago O'Hare (ORD) 1 21:03 Saint Louis (STL) 1
AC 4912 Non-stop Airbus A319 (319) 1:28 Effective 2026-04-07 through 2026-04-13
Codeshare flight, operated by United Airlines.(UA 485)
Tue,Wed,Sat 19:35 Chicago O'Hare (ORD) 1 21:03 Saint Louis (STL) 1
AC 4912 Non-stop Airbus A319 (319) 1:28 Effective 2026-04-15 through 2026-04-21
Codeshare flight, operated by United Airlines.(UA 485)
Tue,Thu,Sun 19:35 Chicago O'Hare (ORD) 1 21:03 Saint Louis (STL) 1
AC 4912 Non-stop Airbus A319 (319) 1:28 Effective 2026-04-23 through 2026-04-28
Codeshare flight, operated by United Airlines.(UA 485)
Mon,Tue,Thu-Sun 19:40 Chicago O'Hare (ORD) 1 21:05 Saint Louis (STL) 1
AC 4912 Non-stop Airbus A319 (319) 1:25 Effective 2026-02-12 through 2026-02-24
Codeshare flight, operated by United Airlines.(UA 2005)
Mon-Wed,Fri 19:40 Chicago O'Hare (ORD) 1 21:05 Saint Louis (STL) 1
AC 4912 Non-stop Airbus A319 (319) 1:25 Effective 2026-02-25 through 2026-03-03
Codeshare flight, operated by United Airlines.(UA 2005)
Wed 19:40 Chicago O'Hare (ORD) 1 21:05 Saint Louis (STL) 1
AC 4912 Non-stop Airbus A320 (320) 1:25 Operates only on 2026-03-04
Codeshare flight, operated by United Airlines.(UA 2005)
Fri 19:42 Chicago O'Hare (ORD) 1 21:07 Saint Louis (STL) 1
AC 4912 Non-stop Boeing 737-900 (739) 1:25 Operates only on 2026-03-06
Codeshare flight, operated by United Airlines.(UA 2379)
Thu 19:42 Chicago O'Hare (ORD) 1 21:07 Saint Louis (STL) 1
AC 4912 Non-stop Boeing 737-900 (739) 1:25 Operates only on 2026-03-19
Codeshare flight, operated by United Airlines.(UA 2379)
Fri 19:42 Chicago O'Hare (ORD) 1 21:07 Saint Louis (STL) 1
AC 4912 Non-stop Boeing 737-900 (739) 1:25 Operates only on 2026-03-27
Codeshare flight, operated by United Airlines.(UA 2379)


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Air Canada flight AC 4912:
Chicago O'Hare - Saint Louis
Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
Air Canada AC4912
07:00
Chicago O'Hare (ORD) 1

08:18
Saint Louis (STL) 1
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1955)
Duration: 1:18, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4912
15:03
Chicago O'Hare (ORD) 2

16:26
Saint Louis (STL) 1
Effective 2026-05-21 through 2026-10-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 5214)
Duration: 1:23, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC4912
16:24
Chicago O'Hare (ORD) 2

17:54
Saint Louis (STL) 1
Valid until 2026-01-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 5873)
Duration: 1:30, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC4912
19:35
Chicago O'Hare (ORD) 1

21:03
Saint Louis (STL) 1
Effective 2026-03-29 through 2026-04-05
Mon
Tue
-
Wed
Thu
-
Fri
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 485)
Duration: 1:28, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4912
19:35
Chicago O'Hare (ORD) 1

21:03
Saint Louis (STL) 1
Effective 2026-04-07 through 2026-04-13
Mon
Tue
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 485)
Duration: 1:28, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4912
19:35
Chicago O'Hare (ORD) 1

21:03
Saint Louis (STL) 1
Effective 2026-04-15 through 2026-04-21
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 485)
Duration: 1:28, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4912
19:35
Chicago O'Hare (ORD) 1

21:03
Saint Louis (STL) 1
Effective 2026-04-23 through 2026-04-28
Mon
-
Tue
Wed
-
Thu
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 485)
Duration: 1:28, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4912
19:40
Chicago O'Hare (ORD) 1

21:05
Saint Louis (STL) 1
Effective 2026-02-12 through 2026-02-24
Mon
Tue
Wed
-
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 2005)
Duration: 1:25, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4912
19:40
Chicago O'Hare (ORD) 1

21:05
Saint Louis (STL) 1
Effective 2026-02-25 through 2026-03-03
Mon
Tue
Wed
Thu
-
Fri
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 2005)
Duration: 1:25, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4912
19:40
Chicago O'Hare (ORD) 1

21:05
Saint Louis (STL) 1
Operates only on 2026-03-04
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 2005)
Duration: 1:25, non-stop
Airbus A320 (320)
Direct Codeshare Flights:
Air Canada AC4912
19:42
Chicago O'Hare (ORD) 1

21:07
Saint Louis (STL) 1
Operates only on 2026-03-06
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 2379)
Duration: 1:25, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC4912
19:42
Chicago O'Hare (ORD) 1

21:07
Saint Louis (STL) 1
Operates only on 2026-03-19
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 2379)
Duration: 1:25, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC4912
19:42
Chicago O'Hare (ORD) 1

21:07
Saint Louis (STL) 1
Operates only on 2026-03-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 2379)
Duration: 1:25, non-stop
Boeing 737-900 (739)
  • AC 4912 is a domestic flight departing from the Chicago O'Hare airport (ORD) and arriving at Saint Louis airport (STL).
  • The flight distance is 258 miles, or 415 km.
  • The timezone of both the departure and the arrival airports is UTC-6 . Current time at both airports is (loading...).
  • For direct flights, the flight time varies between 1:18 and 1:30.
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