Based on your line that "wanna get away fares are $157 one way," I assume you're focusing on Southwest Airlines.
If you wait, the ticket price might be lower, might be higher, or might be the same.
If you buy now and you subsequently see a lower price on Southwest, you can get a Southwest credit (not a credit card credit). The credit is good for one year from when you purchased your original ticket. If you can use the credit, it's a wonderful deal because it essentially eliminates the risk that you might be paying too much if you buy now.
With the legacy carriers (United, Delta, American, US Airways), there's a $200 change fee per ticket. Even if the price goes down substantially, you usually cannot get a credit. (If the price of each ticket drops by $210, you only get a $10 credit per ticket.) If you plan to fly on a legacy carrier, it's sometimes it's worth taking the risk and waiting see if the price goes down. But that can also mean paying even more than the current price.
In general, airline tickets are going up in price as demand increases but capacity is being kept down. Also, there are fewer competitors. Soon, AirTran will be no more, except as a footnote in the history of Southwest Airlines. And the US Airways name will disappear as US Airways absorbs itself into American Airlines, which US Airways acquired.