Southwest knows people rush to buy when the schedule is released and thus does not always release all of the cheapest fares immediately. Fares that are released are also often priced higher. I've said it before and will say it again, buying the moment the schedule opens is not something I would recommend. Fares almost always drop at some point after the release date, and in your case, low fare WGA flights are not even available. Just check back later for the WGA fares. If you're set on buying today you can buy the Anytime fare and just cancel and rebook later when the WGA becomes available.
--TheMiddleSeat
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