United Airlines
flight
UA 6645:
Montreal-Trudeau - Saint Louis
Montreal-Trudeau - Saint Louis
FLIGHT SCHEDULE
Direct Codeshare Flights:
United Airlines UA6645
Effective 2026-09-08 through 2026-10-13
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Air Canada.
(AC 8687)
Duration: 2:47, non-stop Canadair CRJ 900 (CR9)
Direct Codeshare Flights:
United Airlines UA6645
Effective 2026-07-01 through 2026-09-07
Mon
Tue
-
-
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Air Canada.
(AC 8687)
Duration: 2:47, non-stop Canadair CRJ 900 (CR9)
Direct Codeshare Flights:
United Airlines UA6645
Effective 2026-06-30 through 2026-09-01
Mon
-
-
Tue
Wed
-
-
Thu
-
-
Fri
-
-
Sat
-
-
Sun
-
-
Codeshare flight, operated by Air Canada.
(AC 8687)
Duration: 2:47, non-stop Canadair CRJ 900 (CR9)
Direct Codeshare Flights:
United Airlines UA6645
Effective 2026-05-01 through 2026-06-29
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Codeshare flight, operated by Air Canada.
(AC 1565)
Duration: 2:55, non-stop Airbus A220-300 (223)
- UA 6645 is an international flight departing from Montreal-Trudeau airport, Canada (YUL) and arriving at Saint Louis airport, United States (STL).
- The flight distance is 967 miles, or 1557 km.
- The timezone of the departure airport is UTC-5 , and the timezone of the arrival airport is UTC-6 . 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 2:47 and 2:55.