Question : Should you take that vacation to Dallas in the next 30 days?
Answer : Since low prices are preferred, look at Apr 12th. As of Mar 20th, it's showing the cheapest ticket sales at $332. That is 37% below the average price for this route, so you can spend that extra cash on a fun experience in Dallas.
Question : Do prices fluctuate more for this route than others?
Answer : Ranging from $332 to $815, prices for GEG to DAL change less than most routes in the United States. However, the sooner you book, the more you'll be able to save.
Question : How long do most people stay in Dallas?
Answer : Of course you're not most people, but if you were, you'd stay roughly four days.
Question : Is price more important than specific travel days for you?
Answer : The cheapest day to fly in April is Tuesday. Having flexibility in your travel plans means you can save more, so be sure to plan ahead when possible.