Air Canada flight AC 3973: Chicago O'Hare - Denver

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FLIGHT SCHEDULE
Direct Codeshare Flights:
Sat 06:00 Tucson (TUS) 08:55 Denver (DEN)
AC 3973 Non-stop Boeing 737-800 (738) 1:55 Operates only on 2026-04-04
Codeshare flight, operated by United Airlines.(UA 1699)
Sun 08:45 Chicago O'Hare (ORD) 1 10:35 Denver (DEN)
AC 3973 Non-stop Boeing 777 (777) 2:50 Operates only on 2026-01-04
Codeshare flight, operated by United Airlines.(UA 671)
Sat 09:40 Tucson (TUS) 12:50 Denver (DEN)
AC 3973 Non-stop Embraer EMB 175 (E7W) 2:10 Operates only on 2026-04-25
Codeshare flight, operated by United Airlines.(UA 5598)
Mon 13:55 Chicago O'Hare (ORD) 1 15:52 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:57 Operates only on 2026-01-12
Codeshare flight, operated by United Airlines.(UA 1176)
Tue 13:55 Chicago O'Hare (ORD) 1 15:52 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:57 Operates only on 2026-01-20
Codeshare flight, operated by United Airlines.(UA 1176)
Sat,Sun 14:02 Chicago O'Hare (ORD) 1 15:57 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:55 Effective 2026-02-28 through 2026-03-01
Codeshare flight, operated by United Airlines.(UA 1883)
Sat 14:18 Chicago O'Hare (ORD) 1 15:56 Denver (DEN)
AC 3973 Non-stop Boeing 757-300 (753) 2:38 Operates only on 2026-04-11
Codeshare flight, operated by United Airlines.(UA 609)
Tue,Wed 14:36 Chicago O'Hare (ORD) 1 16:34 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:58 Effective 2026-01-28 through 2026-02-03
Codeshare flight, operated by United Airlines.(UA 2347)
Wed 14:36 Chicago O'Hare (ORD) 1 16:34 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:58 Operates only on 2026-02-11
Codeshare flight, operated by United Airlines.(UA 2347)
Tue 14:40 Chicago O'Hare (ORD) 1 16:36 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:56 Operates only on 2026-03-03
Codeshare flight, operated by United Airlines.(UA 2347)
Wed,Sun 14:50 Chicago O'Hare (ORD) 1 16:27 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:37 Effective 2026-03-29 through 2026-04-01
Codeshare flight, operated by United Airlines.(UA 2347)
Wed 14:50 Chicago O'Hare (ORD) 1 16:27 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:37 Operates only on 2026-04-08
Codeshare flight, operated by United Airlines.(UA 2347)
Thu,Sat 14:50 Chicago O'Hare (ORD) 1 16:27 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:37 Effective 2026-04-16 through 2026-04-18
Codeshare flight, operated by United Airlines.(UA 2347)
Mon,Tue 19:39 Chicago O'Hare (ORD) 1 21:25 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:46 Effective 2026-03-31 through 2026-04-07
Codeshare flight, operated by United Airlines.(UA 329)
Tue,Wed 19:39 Chicago O'Hare (ORD) 1 21:25 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:46 Effective 2026-04-14 through 2026-04-29
Codeshare flight, operated by United Airlines.(UA 329)
Mon-Fri,Sun 19:39 Chicago O'Hare (ORD) 1 21:25 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:46 Effective 2026-04-30 through 2026-05-20
Codeshare flight, operated by United Airlines.(UA 329)
Daily 19:39 Chicago O'Hare (ORD) 1 21:25 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:46 Effective 2026-05-21 through 2026-10-24
Codeshare flight, operated by United Airlines.(UA 329)
Mon-Thu,Sat,Sun 19:57 Chicago O'Hare (ORD) 1 21:55 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:58 Effective 2026-03-05 through 2026-03-12
Codeshare flight, operated by United Airlines.(UA 767)
Mon-Wed,Fri,Sun 19:57 Chicago O'Hare (ORD) 1 21:55 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:58 Effective 2026-03-13 through 2026-03-25
Codeshare flight, operated by United Airlines.(UA 767)
Thu,Sat 19:57 Chicago O'Hare (ORD) 1 21:55 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:58 Effective 2026-03-26 through 2026-03-28
Codeshare flight, operated by United Airlines.(UA 767)
Daily 20:00 Chicago O'Hare (ORD) 1 21:46 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:46 Effective from 2026-10-25
Codeshare flight, operated by United Airlines.(UA 329)
Tue,Wed,Fri,Sat 20:02 Chicago O'Hare (ORD) 1 21:59 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:57 Effective 2026-01-07 through 2026-01-13
Codeshare flight, operated by United Airlines.(UA 767)
Mon,Wed,Thu,Sat 20:02 Chicago O'Hare (ORD) 1 21:59 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:57 Effective 2026-01-15 through 2026-01-21
Codeshare flight, operated by United Airlines.(UA 767)
Tue,Thu,Fri,Sun 20:02 Chicago O'Hare (ORD) 1 21:59 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:57 Effective 2026-01-23 through 2026-01-29
Codeshare flight, operated by United Airlines.(UA 767)
Mon,Thu,Sat 20:02 Chicago O'Hare (ORD) 1 21:59 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:57 Effective 2026-01-31 through 2026-02-09
Codeshare flight, operated by United Airlines.(UA 767)
Wed 20:02 Chicago O'Hare (ORD) 1 22:00 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:58 Operates only on 2026-02-04
Codeshare flight, operated by United Airlines.(UA 767)
Tue 20:02 Chicago O'Hare (ORD) 1 21:59 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:57 Operates only on 2026-02-10
Codeshare flight, operated by United Airlines.(UA 767)
Mon,Thu-Sat 20:08 Chicago O'Hare (ORD) 1 22:06 Denver (DEN)
AC 3973 Non-stop Airbus A321neo (32Q) 2:58 Valid until 2026-01-03
Codeshare flight, operated by United Airlines.(UA 767)
Sat 21:05 Chicago O'Hare (ORD) 1 23:02 Denver (DEN)
AC 3973 Non-stop Boeing 737 MAX 8 (7M8) 2:57 Operates only on 2026-01-24
Codeshare flight, operated by United Airlines.(UA 2445)
Tue,Thu,Fri 21:15 Chicago O'Hare (ORD) 1 23:06 Denver (DEN)
AC 3973 Non-stop Boeing 737 MAX 9 (7M9) 2:51 Effective 2026-02-12 through 2026-02-20
Codeshare flight, operated by United Airlines.(UA 329)
Sun 21:15 Chicago O'Hare (ORD) 1 23:06 Denver (DEN)
AC 3973 Non-stop Boeing 737-900 (739) 2:51 Operates only on 2026-02-15
Codeshare flight, operated by United Airlines.(UA 329)
Mon,Wed,Fri 21:15 Chicago O'Hare (ORD) 1 23:06 Denver (DEN)
AC 3973 Non-stop Boeing 737 MAX 9 (7M9) 2:51 Effective 2026-02-23 through 2026-03-02
Codeshare flight, operated by United Airlines.(UA 329)
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Air Canada flight AC 3973:
Chicago O'Hare - Denver
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Select flight date:
FLIGHT SCHEDULE
Direct Codeshare Flights:
Air Canada AC3973
06:00
Tucson (TUS)

08:55
Denver (DEN)
Operates only on 2026-04-04
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 1699)
Duration: 1:55, non-stop
Boeing 737-800 (738)
Direct Codeshare Flights:
Air Canada AC3973
08:45
Chicago O'Hare (ORD) 1

10:35
Denver (DEN)
Operates only on 2026-01-04
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 671)
Duration: 2:50, non-stop
Boeing 777 (777)
Direct Codeshare Flights:
Air Canada AC3973
09:40
Tucson (TUS)

12:50
Denver (DEN)
Operates only on 2026-04-25
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 5598)
Duration: 2:10, non-stop
Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3973
13:55
Chicago O'Hare (ORD) 1

15:52
Denver (DEN)
Operates only on 2026-01-12
Mon
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 1176)
Duration: 2:57, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
13:55
Chicago O'Hare (ORD) 1

15:52
Denver (DEN)
Operates only on 2026-01-20
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 1176)
Duration: 2:57, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
14:02
Chicago O'Hare (ORD) 1

15:57
Denver (DEN)
Effective 2026-02-28 through 2026-03-01
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 1883)
Duration: 2:55, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
14:18
Chicago O'Hare (ORD) 1

15:56
Denver (DEN)
Operates only on 2026-04-11
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 609)
Duration: 2:38, non-stop
Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3973
14:36
Chicago O'Hare (ORD) 1

16:34
Denver (DEN)
Effective 2026-01-28 through 2026-02-03
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 2347)
Duration: 2:58, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
14:36
Chicago O'Hare (ORD) 1

16:34
Denver (DEN)
Operates only on 2026-02-11
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 2347)
Duration: 2:58, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
14:40
Chicago O'Hare (ORD) 1

16:36
Denver (DEN)
Operates only on 2026-03-03
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 2347)
Duration: 2:56, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
14:50
Chicago O'Hare (ORD) 1

16:27
Denver (DEN)
Effective 2026-03-29 through 2026-04-01
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 2347)
Duration: 2:37, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
14:50
Chicago O'Hare (ORD) 1

16:27
Denver (DEN)
Operates only on 2026-04-08
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 2347)
Duration: 2:37, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
14:50
Chicago O'Hare (ORD) 1

16:27
Denver (DEN)
Effective 2026-04-16 through 2026-04-18
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 2347)
Duration: 2:37, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
19:39
Chicago O'Hare (ORD) 1

21:25
Denver (DEN)
Effective 2026-03-31 through 2026-04-07
Mon
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 329)
Duration: 2:46, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
19:39
Chicago O'Hare (ORD) 1

21:25
Denver (DEN)
Effective 2026-04-14 through 2026-04-29
Mon
-
Tue
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 329)
Duration: 2:46, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
19:39
Chicago O'Hare (ORD) 1

21:25
Denver (DEN)
Effective 2026-04-30 through 2026-05-20
Mon
Tue
Wed
Thu
Fri
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 329)
Duration: 2:46, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
19:39
Chicago O'Hare (ORD) 1

21:25
Denver (DEN)
Effective 2026-05-21 through 2026-10-24
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 329)
Duration: 2:46, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
19:57
Chicago O'Hare (ORD) 1

21:55
Denver (DEN)
Effective 2026-03-05 through 2026-03-12
Mon
Tue
Wed
Thu
Fri
-
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 767)
Duration: 2:58, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
19:57
Chicago O'Hare (ORD) 1

21:55
Denver (DEN)
Effective 2026-03-13 through 2026-03-25
Mon
Tue
Wed
Thu
-
Fri
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 767)
Duration: 2:58, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
19:57
Chicago O'Hare (ORD) 1

21:55
Denver (DEN)
Effective 2026-03-26 through 2026-03-28
Mon
-
Tue
-
Wed
-
Thu
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 767)
Duration: 2:58, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
20:00
Chicago O'Hare (ORD) 1

21:46
Denver (DEN)
Effective from 2026-10-25
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines. (UA 329)
Duration: 2:46, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
20:02
Chicago O'Hare (ORD) 1

21:59
Denver (DEN)
Effective 2026-01-07 through 2026-01-13
Mon
-
Tue
Wed
Thu
-
Fri
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 767)
Duration: 2:57, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
20:02
Chicago O'Hare (ORD) 1

21:59
Denver (DEN)
Effective 2026-01-15 through 2026-01-21
Mon
Tue
-
Wed
Thu
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 767)
Duration: 2:57, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
20:02
Chicago O'Hare (ORD) 1

21:59
Denver (DEN)
Effective 2026-01-23 through 2026-01-29
Mon
-
Tue
Wed
-
Thu
Fri
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 767)
Duration: 2:57, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
20:02
Chicago O'Hare (ORD) 1

21:59
Denver (DEN)
Effective 2026-01-31 through 2026-02-09
Mon
Tue
-
Wed
-
Thu
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 767)
Duration: 2:57, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
20:02
Chicago O'Hare (ORD) 1

22:00
Denver (DEN)
Operates only on 2026-02-04
Mon
-
Tue
-
Wed
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 767)
Duration: 2:58, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
20:02
Chicago O'Hare (ORD) 1

21:59
Denver (DEN)
Operates only on 2026-02-10
Mon
-
Tue
Wed
-
Thu
-
Fri
-
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 767)
Duration: 2:57, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
20:08
Chicago O'Hare (ORD) 1

22:06
Denver (DEN)
Valid until 2026-01-03
Mon
Tue
-
Wed
-
Thu
Fri
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 767)
Duration: 2:58, non-stop
Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3973
21:05
Chicago O'Hare (ORD) 1

23:02
Denver (DEN)
Operates only on 2026-01-24
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
Sun
-
Codeshare flight, operated by United Airlines. (UA 2445)
Duration: 2:57, non-stop
Boeing 737 MAX 8 (7M8)
Direct Codeshare Flights:
Air Canada AC3973
21:15
Chicago O'Hare (ORD) 1

23:06
Denver (DEN)
Effective 2026-02-12 through 2026-02-20
Mon
-
Tue
Wed
-
Thu
Fri
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 329)
Duration: 2:51, non-stop
Boeing 737 MAX 9 (7M9)
Direct Codeshare Flights:
Air Canada AC3973
21:15
Chicago O'Hare (ORD) 1

23:06
Denver (DEN)
Operates only on 2026-02-15
Mon
-
Tue
-
Wed
-
Thu
-
Fri
-
Sat
-
Sun
Codeshare flight, operated by United Airlines. (UA 329)
Duration: 2:51, non-stop
Boeing 737-900 (739)
Direct Codeshare Flights:
Air Canada AC3973
21:15
Chicago O'Hare (ORD) 1

23:06
Denver (DEN)
Effective 2026-02-23 through 2026-03-02
Mon
Tue
-
Wed
Thu
-
Fri
Sat
-
Sun
-
Codeshare flight, operated by United Airlines. (UA 329)
Duration: 2:51, non-stop
Boeing 737 MAX 9 (7M9)
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  • AC 3973 is a domestic flight departing from the Chicago O'Hare airport (ORD) and arriving at Denver airport (DEN).
  • The flight distance is 885 miles, or 1425 km.
  • The timezone of the departure airport is UTC-6 , and the timezone of the arrival airport is UTC-7 . Current time at the point of departure is (loading...), and (loading...) at the point of arrival. There is a (loading...) hour time difference between the airports.
  • For direct flights, the flight time varies between 1:55 and 2:58.
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