For decades my friends and family have been flying out of Seattle instead of Vancouver saving a fortune on airline tickets.
Most recently, my sister and dad just got back from a week's holiday in Honolulu. When we priced out round trip tickets from Vancouver to Honolulu to travel in early December, the fare on Air Canada was $600 + $100 tax = $700 per person round trip.
When we priced the same dates Seattle round trip to Honolulu on Travelocity, the fare on United Airlines via San Francisco was $300 per person round trip, inclusive of all taxes! So we booked the tickets with travelocity and my sister and dad had a superb trip.
They took the Quick Shuttle bus between Vancouver and Sea-Tac airport, which cost $80 return for the two of them as they used a two-for-one Entertainment book coupon for the bus.
Both my sister and father were able to get their full Aeroplan points for the flights on United, and as it was via San Francisco they got extra points because of the extra connecting flights. On Air Canada, the $700 fare would only result in half a point per mile flown!
In conclusion, my sister and dad saved over $700 on their tickets to Hawaii by flying out of Seattle instead of Vancouver.
My family has been flying from Seattle to Hawaii since the the early 1970s, and this significant cost anomoly between Canada and the US does not appear to be changing anytime soon! So I encourage everyone to check their travel costs with Travelocity out of Seattle before booking out of Vancouver.