I use Southwest Rapid Rewards points often- round trip flights can often cost less than 5,000 points round trip.
Brad's Deals Editor Mark,
Earn 60,000 points with the Southwest Rapid Rewards® Plus Card after you spend $2,000 on purchases in the first 3 months your account is open. You'll earn unlimited points that don’t expire as long as your card account is open, plus 3,000 bonus points after your cardmember anniversary. For spending bonuses, you'll earn 2 points per $1 spent on Southwest purchases and Rapid Rewards hotel and car rental purchases. Then, you'll earn 1 point per $1 spent on all other purchases. There are no blackout dates or seat restrictions- the number of points required depends on the cash cost of the flight. As always on Southwest, you'll receive two free checked bags and no flight change or cancellation fees.