u/Disastrous-Ad209

I’m supposed to be going to Seattle by train from Vancouver around June 20th-27th for a World Cup game, but my Canadian passport is expired. I’ve applied for a new adult passport (my last one was kids), but i’m worried it won’t get here in time.

If it doesn’t, can I enter the US with my australian passport & an ESTA, and then come back into Canada with the Australian & proof of Canadian citizenship?

I’ve tried looking online but there doesn’t seem to be a definite answer, so any clarity helps