I think Allegiant and Alaska are the only two major commercial airlines that fly out of BLI. You'd have to drive to Seattle if you want to pick other airlines. To be honest, I doubt you'll be able to beat Allegiant's prices (plus the shorter drive is a bonus) so I'd probably stick with Allegiant.
Anyways, you'll probably want to look at airlines where SEA or LAX (or one of the nearby regional airports) is a hub.
I also usually check sites like Hotwire, Cheaptickets, Orbitz, etc for pricing comparison. However, if it were up to me, Id just take Allegiant since driving to Seattle and finding parking is a pain in the ass.
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