Sutherland was actually its own town before it was annexed into Saskatoon decades ago, and it still carries its own commercial strip along Central Avenue, so the trip to Westmount is genuinely a cross-city one rather than a short hop between adjacent subdivisions.
Bridge choice and time of day matter more than the straight-line distance. Rush hour concentrates traffic at a handful of river crossings, and a trip that clears them outside peak hours can look very different from the same route at peak time, which is why no single number describes it honestly.
For a buyer choosing between the two areas, the more useful question is which side of the river your daily destinations actually sit on, since that shapes resale demand more than the city's benchmark of $444,700 alone can show. Get your hand-reviewed valuation from Joel Dyck.