Air Canada
flight
AC 3997:
Multiple routes
FLIGHT SCHEDULE
Direct Codeshare Flights:
Air Canada AC3997
Operates only on 2026-02-12
Mon
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Tue
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Wed
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Thu
Fri
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Sat
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Sun
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Codeshare flight, operated by United Airlines.
(UA 4638)
Duration: 2:05, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-03-29 through 2026-04-08
Mon
Tue
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Wed
Thu
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Fri
Sat
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Sun
Codeshare flight, operated by United Airlines.
(UA 4639)
Duration: 2:02, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-04-11 through 2026-04-18
Mon
Tue
Wed
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Thu
Fri
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Sat
Sun
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Codeshare flight, operated by United Airlines.
(UA 4639)
Duration: 2:02, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-04-21 through 2026-04-28
Mon
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Tue
Wed
Thu
Fri
Sat
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-
Sun
Codeshare flight, operated by United Airlines.
(UA 4639)
Duration: 2:02, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Operates only on 2026-05-18
Mon
Tue
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Wed
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Thu
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Fri
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Sat
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Sun
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Codeshare flight, operated by United Airlines.
(UA 4639)
Duration: 2:02, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Operates only on 2026-08-15
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Codeshare flight, operated by United Airlines.
(UA 4639)
Duration: 2:02, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Operates only on 2026-08-23
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
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Sun
Codeshare flight, operated by United Airlines.
(UA 4639)
Duration: 2:02, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Effective from 2026-10-19
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 4639)
Duration: 2:02, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Valid until 2026-01-05
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 4735)
Duration: 2:15, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-03-05 through 2026-03-12
Mon
Tue
Wed
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-
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 4639)
Duration: 2:06, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-03-14 through 2026-03-20
Mon
Tue
Wed
Thu
Fri
Sat
Sun
-
-
Codeshare flight, operated by United Airlines.
(UA 4639)
Duration: 2:06, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-03-22 through 2026-03-27
Mon
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-
Tue
Wed
Thu
Fri
Sat
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-
Sun
Codeshare flight, operated by United Airlines.
(UA 4639)
Duration: 2:06, non-stop Embraer EMB 175 (E7W)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-03-31 through 2026-04-09
Mon
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Tue
Wed
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Thu
Fri
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Sat
Sun
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Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-04-10 through 2026-04-19
Mon
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Tue
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Wed
Thu
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Fri
Sat
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-
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-04-20 through 2026-04-27
Mon
Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-04-29 through 2026-05-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-05-19 through 2026-05-20
Mon
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Tue
Wed
Thu
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Fri
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Sat
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Sun
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Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-05-21 through 2026-05-31
Mon
Tue
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-
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-06-02 through 2026-06-27
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-06-29 through 2026-07-06
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-07-08 through 2026-07-14
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-07-16 through 2026-07-22
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-07-24 through 2026-07-30
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-08-01 through 2026-08-13
Mon
Tue
Wed
Thu
Fri
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-
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-08-14 through 2026-08-21
Mon
Tue
Wed
Thu
Fri
Sat
-
-
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-08-22 through 2026-08-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
-
-
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-08-30 through 2026-10-18
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 767)
Duration: 2:40, non-stop Boeing 757-300 (753)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-01-06 through 2026-01-18
Mon
-
-
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 2649)
Duration: 2:58, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-01-19 through 2026-01-26
Mon
Tue
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-
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 2649)
Duration: 2:58, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-01-27 through 2026-02-04
Mon
Tue
Wed
Thu
-
-
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 2649)
Duration: 2:58, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-02-05 through 2026-02-11
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by United Airlines.
(UA 2649)
Duration: 2:58, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Operates only on 2026-02-18
Mon
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Tue
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Wed
Thu
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Fri
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Sat
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Sun
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Codeshare flight, operated by United Airlines.
(UA 2649)
Duration: 2:58, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Operates only on 2026-02-26
Mon
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Tue
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Wed
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Thu
Fri
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Sat
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Sun
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Codeshare flight, operated by United Airlines.
(UA 2649)
Duration: 2:58, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Operates only on 2026-03-23
Mon
Tue
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Wed
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Thu
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Fri
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Sat
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Sun
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Codeshare flight, operated by United Airlines.
(UA 2649)
Duration: 2:57, non-stop Boeing 737 MAX 9 (7M9)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-03-11 through 2026-03-15
Mon
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Tue
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Wed
Thu
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Fri
Sat
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Sun
Codeshare flight, operated by United Airlines.
(UA 2649)
Duration: 2:58, non-stop Airbus A321neo (32Q)
Direct Codeshare Flights:
Air Canada AC3997
Effective 2026-03-21 through 2026-03-28
Mon
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Tue
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Wed
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Thu
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Fri
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Sat
Sun
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Codeshare flight, operated by United Airlines.
(UA 2649)
Duration: 2:58, non-stop Airbus A321neo (32Q)
This flight number is listed as serving the following routes:
- Boise (BOI) - San Francisco (SFO)
- Chicago O'Hare (ORD) - Denver (DEN)