If I were willing to leave any time between 9 am and 7 pm, I'd just search for the whole day and throw the exceptions out myself.
However, there are two big differences about flying to Madison from Seattle rather than from New York that I hope you're taking into consideration (aside from the question of whether there are nonstop flights from New York, which I don't know, but there certainly aren't from Seattle). One is that it's a lot longer trip - over twice as far - and the other is that you're going east, and thus the time change is not in your favor. If you want to get anywhere in the midwest or east coast anytime before around midnight, you have to leave the west coast in the morning, and early morning if you're changing flights. That's just the way life is out here.
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However, there are two big differences about flying to Madison from Seattle rather than from New York that I hope you're taking into consideration (aside from the question of whether there are nonstop flights from New York, which I don't know, but there certainly aren't from Seattle). One is that it's a lot longer trip - over twice as far - and the other is that you're going east, and thus the time change is not in your favor. If you want to get anywhere in the midwest or east coast anytime before around midnight, you have to leave the west coast in the morning, and early morning if you're changing flights. That's just the way life is out here.