Me too, for my August dates. Have you used Alaska? I haven't before so wondering how they are.
Last year I booked Frontier out of SEA, and they had very few flights, and ended up cancelling mine, leaving me with a long layover, on my flight going, then coming home they also canceled my flight, and booked my connection before my flight left from MCO

how does that work?
They do have great customer service, and re booked me on another's airline for the same price. But I'd be hesitant to book on an airline again that I haven't flown on.