Air Canada flight AC 4951: Saint Louis - Chicago O'Hare

Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
Daily 05:00 Saint Louis (STL) 1 06:20 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:20 Effective 2026-05-21 through 2026-08-17
Codeshare flight, operated by United Airlines.(UA 4537)
Tue,Thu,Sat 07:45 Saint Louis (STL) 1 09:11 Chicago O'Hare (ORD) 1
AC 4951 Non-stop Airbus A319 (319) 1:26 Effective 2026-03-31 through 2026-04-04
Codeshare flight, operated by United Airlines.(UA 473)
Fri,Sun 07:45 Saint Louis (STL) 1 09:11 Chicago O'Hare (ORD) 1
AC 4951 Non-stop Airbus A319 (319) 1:26 Effective 2026-04-10 through 2026-04-12
Codeshare flight, operated by United Airlines.(UA 473)
Mon,Sun 07:45 Saint Louis (STL) 1 09:11 Chicago O'Hare (ORD) 1
AC 4951 Non-stop Airbus A319 (319) 1:26 Effective 2026-04-19 through 2026-04-20
Codeshare flight, operated by United Airlines.(UA 473)
Mon,Wed 07:45 Saint Louis (STL) 1 09:11 Chicago O'Hare (ORD) 1
AC 4951 Non-stop Airbus A319 (319) 1:26 Effective 2026-04-27 through 2026-04-29
Codeshare flight, operated by United Airlines.(UA 473)
Mon,Wed 08:26 Saint Louis (STL) 1 09:55 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:29 Effective 2026-04-06 through 2026-04-08
Codeshare flight, operated by United Airlines.(UA 4608)
Tue,Thu 08:26 Saint Louis (STL) 1 09:55 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:29 Effective 2026-04-14 through 2026-04-16
Codeshare flight, operated by United Airlines.(UA 4608)
Wed,Fri 08:26 Saint Louis (STL) 1 09:55 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:29 Effective 2026-04-22 through 2026-04-24
Codeshare flight, operated by United Airlines.(UA 4608)
Mon,Wed,Fri,Sun 18:35 Saint Louis (STL) 1 20:04 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:29 Effective 2026-03-29 through 2026-04-05
Codeshare flight, operated by United Airlines.(UA 4616)
Mon,Tue,Thu,Sat 18:35 Saint Louis (STL) 1 20:04 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:29 Effective 2026-04-07 through 2026-04-13
Codeshare flight, operated by United Airlines.(UA 4616)
Tue,Wed,Fri,Sat 18:35 Saint Louis (STL) 1 20:04 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:29 Effective 2026-04-15 through 2026-04-21
Codeshare flight, operated by United Airlines.(UA 4616)
Tue,Thu,Sat,Sun 18:35 Saint Louis (STL) 1 20:04 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:29 Effective 2026-04-23 through 2026-04-28
Codeshare flight, operated by United Airlines.(UA 4616)
Fri 18:45 Saint Louis (STL) 1 20:20 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Embraer EMB 175 (E7W) 1:35 Effective 2026-02-13 through 2026-02-27
Codeshare flight, operated by United Airlines.(UA 3714)
Daily 18:45 Saint Louis (STL) 1 20:09 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:24 Effective from 2026-10-25
Codeshare flight, operated by United Airlines.(UA 4616)
Mon,Wed,Thu,Sun 18:55 Saint Louis (STL) 1 20:28 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:33 Effective 2026-02-12 through 2026-03-04
Codeshare flight, operated by United Airlines.(UA 4495)
Daily 19:00 Saint Louis (STL) 1 20:33 Chicago O'Hare (ORD) 2
AC 4951 Non-stop Canadair CRJ 550 (CR5) 1:33 Effective 2026-03-05 through 2026-03-28
Codeshare flight, operated by United Airlines.(UA 5417)


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Air Canada flight AC 4951:
Saint Louis - Chicago O'Hare
Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
Air Canada AC4951
05:00
Saint Louis (STL) 1

06:20
Chicago O'Hare (ORD) 2
Effective 2026-05-21 through 2026-08-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 4537)
Duration: 1:20, non-stop
Canadair CRJ 550 (CR5)
Direct Codeshare Flights:
Air Canada AC4951
07:45
Saint Louis (STL) 1

09:11
Chicago O'Hare (ORD) 1
Effective 2026-03-31 through 2026-04-04
Mon
-
Tue
Wed
-
Thu
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 473)
Duration: 1:26, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4951
07:45
Saint Louis (STL) 1

09:11
Chicago O'Hare (ORD) 1
Effective 2026-04-10 through 2026-04-12
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 473)
Duration: 1:26, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4951
07:45
Saint Louis (STL) 1

09:11
Chicago O'Hare (ORD) 1
Effective 2026-04-19 through 2026-04-20
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 473)
Duration: 1:26, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4951
07:45
Saint Louis (STL) 1

09:11
Chicago O'Hare (ORD) 1
Effective 2026-04-27 through 2026-04-29
Mon
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 473)
Duration: 1:26, non-stop
Airbus A319 (319)
Direct Codeshare Flights:
Air Canada AC4951
08:26
Saint Louis (STL) 1

09:55
Chicago O'Hare (ORD) 2
Effective 2026-04-06 through 2026-04-08
Mon
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 4608)
Duration: 1:29, non-stop
Canadair CRJ 550 (CR5)
Direct Codeshare Flights:
Air Canada AC4951
08:26
Saint Louis (STL) 1

09:55
Chicago O'Hare (ORD) 2
Effective 2026-04-14 through 2026-04-16
Mon
-
Tue
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 4608)
Duration: 1:29, non-stop
Canadair CRJ 550 (CR5)
Direct Codeshare Flights:
Air Canada AC4951
08:26
Saint Louis (STL) 1

09:55
Chicago O'Hare (ORD) 2
Effective 2026-04-22 through 2026-04-24
Mon
-
Tue
-
Wed
Thu
-
Fri
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 4608)
Duration: 1:29, non-stop
Canadair CRJ 550 (CR5)
Direct Codeshare Flights:
Air Canada AC4951
18:35
Saint Louis (STL) 1

20:04
Chicago O'Hare (ORD) 2
Effective 2026-03-29 through 2026-04-05
Mon
Tue
-
Wed
Thu
-
Fri
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 4616)
Duration: 1:29, non-stop
Canadair CRJ 550 (CR5)
Direct Codeshare Flights:
Air Canada AC4951
18:35
Saint Louis (STL) 1

20:04
Chicago O'Hare (ORD) 2
Effective 2026-04-07 through 2026-04-13
Mon
Tue
Wed
-
Thu
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 4616)
Duration: 1:29, non-stop
Canadair CRJ 550 (CR5)
Direct Codeshare Flights:
Air Canada AC4951
18:35
Saint Louis (STL) 1

20:04
Chicago O'Hare (ORD) 2
Effective 2026-04-15 through 2026-04-21
Mon
-
Tue
Wed
Thu
-
Fri
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 4616)
Duration: 1:29, non-stop
Canadair CRJ 550 (CR5)
Direct Codeshare Flights:
Air Canada AC4951
18:35
Saint Louis (STL) 1

20:04
Chicago O'Hare (ORD) 2
Effective 2026-04-23 through 2026-04-28
Mon
-
Tue
Wed
-
Thu
Fri
-
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 4616)
Duration: 1:29, non-stop
Canadair CRJ 550 (CR5)
Direct Codeshare Flights:
Air Canada AC4951
18:45
Saint Louis (STL) 1

20:20
Chicago O'Hare (ORD) 2
Effective 2026-02-13 through 2026-02-27
Mon
-
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 3714)
Duration: 1:35, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC4951
18:45
Saint Louis (STL) 1

20:09
Chicago O'Hare (ORD) 2
Effective from 2026-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 4616)
Duration: 1:24, non-stop
Canadair CRJ 550 (CR5)
Direct Codeshare Flights:
Air Canada AC4951
18:55
Saint Louis (STL) 1

20:28
Chicago O'Hare (ORD) 2
Effective 2026-02-12 through 2026-03-04
Mon
Tue
-
Wed
Thu
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 4495)
Duration: 1:33, non-stop
Canadair CRJ 550 (CR5)
Direct Codeshare Flights:
Air Canada AC4951
19:00
Saint Louis (STL) 1

20:33
Chicago O'Hare (ORD) 2
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 5417)
Duration: 1:33, non-stop
Canadair CRJ 550 (CR5)
  • AC 4951 is a domestic flight departing from the Saint Louis airport (STL) and arriving at Chicago O'Hare airport (ORD).
  • 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 1:20 and 1:35.
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