United Airlines
flight
UA 6646:
Saint Louis - Montreal-Trudeau
Saint Louis - Montreal-Trudeau
FLIGHT SCHEDULE
Direct Codeshare Flights:
United Airlines UA6646
Effective 2026-07-01 through 2026-09-07
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Air Canada.
(AC 8688)
Duration: 2:32, non-stop Canadair CRJ 900 (CR9)
Direct Codeshare Flights:
United Airlines UA6646
Effective 2026-05-01 through 2026-06-17
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Air Canada.
(AC 1564)
Duration: 2:35, non-stop Airbus A220-300 (223)
Direct Codeshare Flights:
United Airlines UA6646
Effective 2026-06-18 through 2026-06-30
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Air Canada.
(AC 1564)
Duration: 2:35, non-stop Airbus A220-300 (223)
Direct Codeshare Flights:
United Airlines UA6646
Effective 2026-09-08 through 2026-10-14
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Air Canada.
(AC 8688)
Duration: 2:29, non-stop Canadair CRJ 900 (CR9)
- UA 6646 is an international flight departing from Saint Louis airport, United States (STL) and arriving at Montreal-Trudeau airport, Canada (YUL).
- The flight distance is 967 miles, or 1557 km.
- The timezone of the departure airport is UTC-6 , and the timezone of the arrival airport is UTC-5 . 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 2:29 and 2:35.