While Frontier Airlines seems to have some sort of sale every.single.day, I have yet to see a sale this good — 99% off many routes on select days! This is a one day sale only, so you must purchase your tickets today November 5, 2018, but remember, you do have 24-hours to cancel for a full refund. Use code SAVE99 to receive the discount. Note: The 99% discount does not apply to taxes/fees which make up the bulk of the fare, so do not expect to see any ridiculously low $5 fares.
This promotion is valid for nonstop domestic travel on the following dates: Nov. 10, 13-15, 28-29, 2018; Dec. 1, 4-5, 8, 11-12, 2018; Jan. 8-9, 12, 15-16, 22-23, 29-30, 2019; and Feb. 5-6, 12, 2019. And unfortunately there are many routes that are not eligible or do not even fly on those particular days. While the dates and route exclusions can be limiting, there are definitely some amazing deals to be found. You can also check out all of their nonstop routes here.
Remember though, with Frontier, you are charged for every little extra thing, including seat assignment and cary on bags. So even though this might turn out to be a great deal, with all the ad-on fees, make sure it truly is a deal for you!