| Cheap Flights: Austin or San Antonio to/from Toronto $256-$279 r/t [September-March] â American Airlines / Delta / Air Canada American Airlines, Delta, or Air Canada has round-trip flights from Austin (AUS) to Toronto (YYZ) for $256-$279 with a connection. Flights September to March. Weekends available. Origin/Destination reversible. Click for more details and booking links Cheap Flights: Austin or San Antonio to/from Toronto $256-$279 r/t [September-March] â American Airlines / Delta / Air Canada . | 