Moved from Butterflies (excluding skippers).

intergrade or hybridize in southern British Columbia, and so some may be intermediate in character. I'm not sure which type dominates in that specific location, but you are far enough north that I would expect it to be the Canadian Tigers. However, the photo looks to me perhaps more like a Western. One thing I notice is that the faint spot on the hindwing in the black border, just back of the front wing, is indeed faint and not particularly orange. On a Canadian this spot is usually fairly prominent and bright orange. However, the two "species" are very similar, and can be very difficult to tell apart where they might both occur, especially from a shot of the upper side. Westerns tend to average larger, but the ~4 inch size could fit either one. Canadians tend to have lots more orange on the underside of the hind wings, but you can't see that here.

[personally - I think they are geographic subspecies of one same species - just my opinion]

I can add that this individual is definitely a male.

follow-up:
I just looked at a map and at the Canadian Butterflies website, and they show only Canadian Tiger Swallowtails from as far north as Prince George (by a wide margin); so, Papilio canadensis it must be.

I don't know much about swallowtails, but I would think that Eastern Tiger Swallowtail would be ruled out by range alone. The Canadian Tiger Swallowtail is also similar, so you might want to compare that species to the Western Tiger and see which one fits.