United Airlines flight UA 423: Multiple routes

Select flight date:
FLIGHT SCHEDULE
Direct Flights:
Thu 10:00 Denver (DEN) 14:55 Detroit (DTW) E
UA 423 Non-stop Airbus A320 (320) 2:55 Operates only on 2026-02-12
Daily 10:00 Denver (DEN) 14:55 Detroit (DTW) E
UA 423 Non-stop Airbus A319 (319) 2:55 Effective 2026-02-13 through 2026-03-04
Daily 10:03 Denver (DEN) 13:35 Houston George Bush (IAH) C
UA 423 Non-stop Boeing 757-300 (753) 2:32 Effective 2026-03-05 through 2026-03-28
Daily 12:35 Athens (ATH) 16:05 Chicago O'Hare (ORD) 5
UA 423 Non-stop Boeing 787-8 (788) 11:30 Effective 2026-04-14 through 2026-04-30
Daily 12:35 Athens (ATH) 16:05 Chicago O'Hare (ORD) 5
UA 423 Non-stop Boeing 787-10 (781) 11:30 Effective 2026-05-01 through 2026-05-20
Daily 12:35 Athens (ATH) 16:25 Chicago O'Hare (ORD) 5
UA 423 Non-stop Boeing 787-10 (781) 11:50 Effective 2026-05-21 through 2026-09-07
Daily 12:35 Athens (ATH) 16:20 Chicago O'Hare (ORD) 5
UA 423 Non-stop Boeing 787-10 (781) 11:45 Effective 2026-09-08 through 2026-09-24
Thu 15:07 Newark Liberty, New York (EWR) C 18:08 Orlando (MCO) B
UA 423 Non-stop Boeing 737-900 (739) 3:01 Operates only on 2026-01-29
Tue 15:08 Newark Liberty, New York (EWR) C 18:09 Orlando (MCO) B
UA 423 Non-stop Boeing 737 MAX 8 (7M8) 3:01 Operates only on 2026-01-06
Mon-Fri,Sun 15:08 Newark Liberty, New York (EWR) C 18:09 Orlando (MCO) B
UA 423 Non-stop Boeing 737-900 (739) 3:01 Effective 2026-01-07 through 2026-01-28
Sat 15:08 Newark Liberty, New York (EWR) A 18:09 Orlando (MCO) B
UA 423 Non-stop Boeing 737-900 (739) 3:01 Effective 2026-01-10 through 2026-02-07
Mon-Fri,Sun 15:08 Newark Liberty, New York (EWR) C 18:09 Orlando (MCO) B
UA 423 Non-stop Boeing 737-900 (739) 3:01 Effective 2026-01-30 through 2026-02-11
Sat 18:05 Denver (DEN) 22:59 John Glenn Columbus (CMH)
UA 423 Non-stop Boeing 737-800 (738) 2:54 Valid until 2026-01-03
Mon-Fri,Sun 18:10 Denver (DEN) 23:04 John Glenn Columbus (CMH)
UA 423 Non-stop Boeing 737-800 (738) 2:54 Valid until 2026-01-05
This flight number is listed as serving the following routes:


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United Airlines flight UA 423: Multiple routes
Select flight date:
FLIGHT SCHEDULE
Direct Flights:
United Airlines UA423
10:00
Denver (DEN)

14:55
Detroit (DTW) E
Operates only on 2026-02-12
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 2:55, non-stop
Airbus A320 (320)
Direct Flights:
United Airlines UA423
10:00
Denver (DEN)

14:55
Detroit (DTW) E
Effective 2026-02-13 through 2026-03-04
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:55, non-stop
Airbus A319 (319)
Direct Flights:
United Airlines UA423
10:03
Denver (DEN)

13:35
Houston George Bush (IAH) C
Effective 2026-03-05 through 2026-03-28
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 2:32, non-stop
Boeing 757-300 (753)
Direct Flights:
United Airlines UA423
12:35
Athens (ATH)

16:05
Chicago O'Hare (ORD) 5
Effective 2026-04-14 through 2026-04-30
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 11:30, non-stop
Boeing 787-8 (788)
Direct Flights:
United Airlines UA423
12:35
Athens (ATH)

16:05
Chicago O'Hare (ORD) 5
Effective 2026-05-01 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 11:30, non-stop
Boeing 787-10 (781)
Direct Flights:
United Airlines UA423
12:35
Athens (ATH)

16:25
Chicago O'Hare (ORD) 5
Effective 2026-05-21 through 2026-09-07
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 11:50, non-stop
Boeing 787-10 (781)
Direct Flights:
United Airlines UA423
12:35
Athens (ATH)

16:20
Chicago O'Hare (ORD) 5
Effective 2026-09-08 through 2026-09-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Duration: 11:45, non-stop
Boeing 787-10 (781)
Direct Flights:
United Airlines UA423
15:07
Newark Liberty, New York (EWR) C

18:08
Orlando (MCO) B
Operates only on 2026-01-29
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
-
Sun
-
Duration: 3:01, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA423
15:08
Newark Liberty, New York (EWR) C

18:09
Orlando (MCO) B
Operates only on 2026-01-06
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Duration: 3:01, non-stop
Boeing 737 MAX 8 (7M8)
Direct Flights:
United Airlines UA423
15:08
Newark Liberty, New York (EWR) C

18:09
Orlando (MCO) B
Effective 2026-01-07 through 2026-01-28
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 3:01, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA423
15:08
Newark Liberty, New York (EWR) A

18:09
Orlando (MCO) B
Effective 2026-01-10 through 2026-02-07
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 3:01, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA423
15:08
Newark Liberty, New York (EWR) C

18:09
Orlando (MCO) B
Effective 2026-01-30 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 3:01, non-stop
Boeing 737-900 (739)
Direct Flights:
United Airlines UA423
18:05
Denver (DEN)

22:59
John Glenn Columbus (CMH)
Valid until 2026-01-03
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Duration: 2:54, non-stop
Boeing 737-800 (738)
Direct Flights:
United Airlines UA423
18:10
Denver (DEN)

23:04
John Glenn Columbus (CMH)
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Duration: 2:54, non-stop
Boeing 737-800 (738)
This flight number is listed as serving the following routes:
  • Athens (ATH) - Chicago O'Hare (ORD)
  • Denver (DEN) - Detroit (DTW)
  • Denver (DEN) - Houston George Bush (IAH)
  • Denver (DEN) - John Glenn Columbus (CMH)
  • Newark Liberty, New York (EWR) - Orlando (MCO)
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