Sometimes. It depends on where you fly.
On the 349 days we compared, Discount Den was cheaper on 349 of them (100%), by $4 on average. Count the days it saved nothing and that's about $4 per one-way trip.
A quick test: divide Frontier's current yearly fee by $4. That's roughly how many one-way trips from Aguadilla a year, booked close to departure like these, before the membership pays for itself.
Paid off most often
- Orlando: 100% of days, $1 when cheaper
Since oct 27. Fares we saw on checks made 0 to 2 days before departure. Fares booked further ahead can be different.