United Airlines flight UA 4540: Multiple routes

Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Daily 07:00 Chattanooga (CHA) 07:53 Chicago O'Hare (ORD) 2
UA 4540 Non-stop Canadair CRJ 550 (CR5) 1:53 Effective 2026-03-29 through 2026-04-29
Daily 07:00 Chattanooga (CHA) 07:53 Chicago O'Hare (ORD) 2
UA 4540 Non-stop Canadair CRJ 550 (CR5) 1:53 Effective from 2026-05-21
Mon,Fri 14:30 Chicago O'Hare (ORD) 2 16:41 Indianapolis (IND)
UA 4540 Non-stop Canadair CRJ 550 (CR5) 1:11 Effective 2026-02-06 through 2026-02-09
Sat 14:52 Chicago O'Hare (ORD) 2 17:03 Indianapolis (IND)
UA 4540 Non-stop Canadair CRJ 550 (CR5) 1:11 Effective 2026-01-10 through 2026-02-07
Sat 15:00 Raleigh/Durham (RDU) 2 16:18 Washington Dulles (IAD)
UA 4540 Non-stop Canadair CRJ 550 (CR5) 1:18 Effective 2026-03-07 through 2026-03-28
Mon,Thu,Fri,Sun 17:27 Knoxville (TYS) 18:31 Chicago O'Hare (ORD) 2
UA 4540 Non-stop Canadair CRJ 550 (CR5) 2:04 Effective 2026-02-12 through 2026-03-02
Mon 17:50 Chicago O'Hare (ORD) 2 20:58 Roanoke (ROA)
UA 4540 Non-stop Canadair CRJ 550 (CR5) 2:08 Operates only on 2026-01-05
Daily 20:00 Houston George Bush (IAH) 21:11 Baton Rouge (BTR)
UA 4540 Non-stop Canadair CRJ 550 (CR5) 1:11 Effective 2026-04-30 through 2026-05-20
Daily 22:20 Washington Dulles (IAD) 23:30 Philadelphia (PHL) D
UA 4540 Non-stop Canadair CRJ 550 (CR5) 1:10 Valid until 2026-01-04
This flight number is listed as serving the following routes:


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United Airlines flight UA 4540: Multiple routes
Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA4540
07:00
Chattanooga (CHA)

07:53
Chicago O'Hare (ORD) 2
Effective 2026-03-29 through 2026-04-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:53, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4540
07:00
Chattanooga (CHA)

07:53
Chicago O'Hare (ORD) 2
Effective from 2026-05-21
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:53, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4540
14:30
Chicago O'Hare (ORD) 2

16:41
Indianapolis (IND)
Effective 2026-02-06 through 2026-02-09
Mon
Tue
-
Wed
-
Thu
-
Fri
Sat
-
Sun
-
Duration: 1:11, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4540
14:52
Chicago O'Hare (ORD) 2

17:03
Indianapolis (IND)
Effective 2026-01-10 through 2026-02-07
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:11, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4540
15:00
Raleigh/Durham (RDU) 2

16:18
Washington Dulles (IAD)
Effective 2026-03-07 through 2026-03-28
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 1:18, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4540
17:27
Knoxville (TYS)

18:31
Chicago O'Hare (ORD) 2
Effective 2026-02-12 through 2026-03-02
Mon
Tue
-
Wed
-
Thu
Fri
Sat
-
Sun
Duration: 2:04, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4540
17:50
Chicago O'Hare (ORD) 2

20:58
Roanoke (ROA)
Operates only on 2026-01-05
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 2:08, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4540
20:00
Houston George Bush (IAH)

21:11
Baton Rouge (BTR)
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:11, non-stop
Canadair CRJ 550 (CR5)
Direct Flights:
United Airlines UA4540
22:20
Washington Dulles (IAD)

23:30
Philadelphia (PHL) D
Valid until 2026-01-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 1:10, non-stop
Canadair CRJ 550 (CR5)
This flight number is listed as serving the following routes:
  • Chattanooga (CHA) - Chicago O'Hare (ORD)
  • Chicago O'Hare (ORD) - Indianapolis (IND)
  • Chicago O'Hare (ORD) - Roanoke (ROA)
  • Houston George Bush (IAH) - Baton Rouge (BTR)
  • Knoxville (TYS) - Chicago O'Hare (ORD)
  • Raleigh/Durham (RDU) - Washington Dulles (IAD)
  • Washington Dulles (IAD) - Philadelphia (PHL)
All United Airlines flights
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