United Airlines flight UA 4423: Multiple routes

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FLIGHT SCHEDULE
Direct Flights:
Daily 06:25 Saint Louis (STL) 1 07:58 Chicago O'Hare (ORD) 2
UA 4423 Non-stop Canadair CRJ 550 (CR5) 1:33 Effective 2026-02-13 through 2026-03-28
Mon-Wed,Fri-Sun 06:30 Saint Louis (STL) 1 08:05 Chicago O'Hare (ORD) 2
UA 4423 Non-stop Canadair CRJ 550 (CR5) 1:35 Valid until 2026-01-07
Daily 06:30 Saint Louis (STL) 1 08:05 Chicago O'Hare (ORD) 2
UA 4423 Non-stop Canadair CRJ 550 (CR5) 1:35 Effective 2026-01-08 through 2026-02-03
Daily 06:30 Saint Louis (STL) 1 08:05 Chicago O'Hare (ORD) 2
UA 4423 Non-stop Canadair CRJ 550 (CR5) 1:35 Effective 2026-02-05 through 2026-02-11
Thu 06:30 Saint Louis (STL) 1 08:03 Chicago O'Hare (ORD) 2
UA 4423 Non-stop Canadair CRJ 550 (CR5) 1:33 Operates only on 2026-02-12
Daily 06:30 Saint Louis (STL) 1 07:59 Chicago O'Hare (ORD) 2
UA 4423 Non-stop Canadair CRJ 550 (CR5) 1:29 Effective 2026-03-29 through 2026-04-29
Daily 06:40 Saint Louis (STL) 1 08:00 Chicago O'Hare (ORD) 2
UA 4423 Non-stop Canadair CRJ 550 (CR5) 1:20 Effective from 2026-04-30
Wed 08:45 Chicago O'Hare (ORD) 2 11:02 Little Rock (LIT)
UA 4423 Non-stop Canadair CRJ 550 (CR5) 2:17 Operates only on 2026-02-04
Daily 09:00 Chicago O'Hare (ORD) 2 10:11 Madison (MSN)
UA 4423 Non-stop Canadair CRJ 550 (CR5) 1:11 Effective 2026-03-29 through 2026-04-29
Non-Direct Flights:
Daily 06:30 Saint Louis (STL) 1 10:11 Madison (MSN)
UA 4423 1-stop Canadair CRJ 550 (CR5) 3:41 Effective 2026-03-29 through 2026-04-29
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This flight number is listed as serving the following routes:


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United Airlines flight UA 4423: Multiple routes
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Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA4423
06:25
Saint Louis (STL) 1

07:58
Chicago O'Hare (ORD) 2
Effective 2026-02-13 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:33, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4423
06:30
Saint Louis (STL) 1

08:05
Chicago O'Hare (ORD) 2
Valid until 2026-01-07
Mon
Tue
Wed
Thu
-
Fri
Sat
Sun
Duration: 1:35, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4423
06:30
Saint Louis (STL) 1

08:05
Chicago O'Hare (ORD) 2
Effective 2026-01-08 through 2026-02-03
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:35, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4423
06:30
Saint Louis (STL) 1

08:05
Chicago O'Hare (ORD) 2
Effective 2026-02-05 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:35, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4423
06:30
Saint Louis (STL) 1

08:03
Chicago O'Hare (ORD) 2
Operates only on 2026-02-12
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 1:33, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4423
06:30
Saint Louis (STL) 1

07:59
Chicago O'Hare (ORD) 2
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:29, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4423
06:40
Saint Louis (STL) 1

08:00
Chicago O'Hare (ORD) 2
Effective from 2026-04-30
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:20, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4423
08:45
Chicago O'Hare (ORD) 2

11:02
Little Rock (LIT)
Operates only on 2026-02-04
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:17, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4423
09:00
Chicago O'Hare (ORD) 2

10:11
Madison (MSN)
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:11, non-stop
Canadair CRJ 550 (CR5)
Non-Direct Flights:
United Airlines UA4423
06:30
Saint Louis (STL) 1

10:11
Madison (MSN)
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 3:41, 1-stop
Canadair CRJ 550 (CR5)
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This flight number is listed as serving the following routes:
  • Chicago O'Hare (ORD) - Little Rock (LIT)
  • Chicago O'Hare (ORD) - Madison (MSN)
  • Saint Louis (STL) - Chicago O'Hare (ORD)
  • Saint Louis (STL) - Madison (MSN)
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