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Note: Some of the offers mentioned below may have changed or are no longer be available. You can view current offers here.

Frontier is offering $15 one way fares on routes like San Francisco to Las Vegas and Indianapolis to Orlando.

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The sale is valid for bookings made by tomorrow December 1 for domestic, nonstop travel with no blackout dates. However the sales page has different restrictions on certain sale fares.

To get the best deals, you have to be a Discount Den member, which Frontier charges $50 to join. Here’s my analysis of whether you should join the Frontier Discount Den. The best deal for non-members are $19 fares.

Here is the sale page and restrictions. I see $19, $29, and $39 fares between dozens of cities. Here are some of the deals departing Detroit.

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I had no trouble pricing out Denver to Las Vegas for $15/$19.

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Frontier now follows the ultra-low-cost, fee-for-everything model.

Seat selection costs $4+. They’ll assign you a seat at check in for free, but you’ll probably get the worst one.

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Only a personal item is free to bring on board. Checked bags cost $25+ and carry ons cost $30+ (and $5 more over the holidays), so I would think of these fares as costing $25-$30 more each way and plan on checking a bag.

Even water costs money. Here’s the snack and drink menu.
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Getting These Flights for Free

There’s no need to actually pay cash for cheap, cash fares. The Citi Prestige® Card comes with a $250 Air Travel Credit every calendar year that will cover the purchase of this ticket. If you haven’t used the credit yet, buy this fare with your Prestige, and you will receive an offsetting credit on your next statement, so you’ll get a completely free ticket. The Air Travel Credit will also offset seat selection, baggage, and food fees.