Spring is officially here, even though this snowy hellscape feels exactly like the snowy hellscape before the first day of spring. Nonetheless, the arrival of spring has been marked by cheap flights all over the place, from those ridiculous $171 round-trip flights to Hawaii to Southwest's spring sale or $99 one-way fares to Europe.
Add this quick sale from Frontier to the list. The budget airline is offering 90% off a one-way flight until midnight on March 23. To get the discount, just enter the code "SAVE90" at the end of the checkout process.
The cheapest flights on offer are $20 one-way fares on shorter routes. However, the bulk of that $20 price tag is comprised of fees and taxes, which are not 90% off. In the example below, you can see cheap fares result in meager savings with the 90% off code. (Though, $37.70 for round-trip tickets is an awfully nice price.)