The latest promo code sale from Frontier allows you to take 75% off the base fare for travel through June 9. Fares start at just $37 round-trip.

Use promo code SAVE75 when booking on to take 75% off the base fare for nonstop domestic flights. Travel is valid on all days of the week from May 17 through June 9. Avoid blackout dates on May 20, 24, 25, 28, & June 3.

The discount does not apply to taxes nor Frontier's online booking fee, which they label a "Carrier Interface Charge". This means some routes still won't have a very big price drop even with the big sticker shock of 75% off. However, there are plenty of routes where we are seeing very large discounts so you may be able to save big depending on your route/dates.

There is a long list of specific routes excluded from the promo code sale. Frontier operates about half of their markets on a limited and/or seasonal basis, so be sure to check out the fare details for specifics.

Tickets must be booked by 11:59 p.m. ET, on May 16.

A sample of nonstop fares include:

Providence to Raleigh $37 round-trip

Trenton to Myrtle Beach $37 round-trip

Atlanta to Orlando $51 round-trip

Denver to Las Vegas $51 round-trip

Grand Rapids to Philadelphia $51 round-trip

Philadelphia to Charleston $51 round-trip

Washington D.C. to Orlando $56 round-trip

Philadelphia to Indianapolis $61 round-trip

Chicago to El Paso $61 round-trip

Detroit to Orlando $66 round-trip

Denver to Phoenix $72 round-trip

Dallas to Denver $74 round-trip

Long Island-Islip to West Palm Beach $78 round-trip

Portland to Austin $79 round-trip

Cincinnati to New York $81 round-trip

Milwaukee to Raleigh $82 round-trip

San Francisco to Denver $86 round-trip

Austin to Seattle $88 round-trip

Chicago to Pensacola $88 round-trip

Buffalo to Orlando $93 round-trip

Cleveland to Portland $96 round-trip

Washington D.C. to Las Vegas $97 round-trip

Denver to Philadelphia $106 round-trip

Indianapolis to Las Vegas $107 round-trip

Denver to Savannah $115 round-trip

Los Angeles to Atlanta $122 round-trip

Nashville to Las Vegas $124 round-trip

Atlanta to San Juan $131 round-trip

Many more routes are available and these fares all work in reverse as well. Lowest fares may not be available throughout the entire travel period. You'll have to decline all extras to get the lowest price.

Check our pages for all flights to DenverLas VegasOrlandoTampaPhiladelphia, CincinnatiCleveland, Austin, and Raleigh to see more of today's finds. This is not a full list of Frontier cities, so check flights from your city to see what's available.

Keep in mind that Frontier charges extra for any bags larger than a small personal item (small backpack, briefcase, large purse, etc.). Pack super light to get the lowest price. Checked bag fees start at $25 each way. Larger carry-on bag fees start at $30 each way.

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