I used to fly out of SeaTac and even with hotel both ways it was cheaper. Now there isn't a sig enough difference so flying out of YVR, Alaska. $738 per person in late nov, return early Dec

. Flight out of SeaTac $606
So with hotels that pretty much eats up any savings. Flight leaves SeaTac at 8:00 am, would have to check in at 6:00am and would have to drive down to Seattle leaving Vancouver by 2:00am if I didn't book overnight hotel room. Not up for driving with no sleep.
Sad. I remember flights RT out of Seattle for $300, so was still quite a savings even with park n fly hotel room.
I ended up booking flight home with miles, so only have to pay outgoing flight. $389. I looked up Tampa, it is cheaper, $331 (one way YVR to Tampa ) but having to rent a car and drive 90 min again, takes away any savings. Like the ease of DME and not seeing luggage until it magically appears in room, lol.
I never have a car rental in WDW. Prefer to let Disney do the driving. Especially with all the road work happening.
Plus if we have another winter like this past one, no way am I driving down to Seattle! Yikes.