Book quickly! Frontier has a promo code valid for purchase today only. Take 75% off the base fare for late summer/fall travel. Fares start at just $49 roundtrip.

Use promo code SAVE75 when booking on FlyFrontier.com to take 75% off the base fare for nonstop domestic flights. Travel is valid on Tuesdays, Wednesdays, and Saturdays, from August 14 through November 14. Avoid blackout dates on September 1 and 4.

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 deep discounts.

There are a few specific routes excluded from the promo code sale. You may have to click around to find available dates since Frontier operates about half of the route network just a few days each week. Click on the fare details for more info on exact dates each route is available.

Tickets must be booked by 11:59pm ET, tonight, July 9.

A sample of nonstop fares include:

Greenville to Orlando $49 roundtrip

Columbus to Orlando $56 roundtrip

Detroit to Raleigh $69 roundtrip

Austin to Minneapolis $72 roundtrip

St. Louis to Las Vegas $74 roundtrip

Harrisburg to Orlando $77 roundtrip

Houston to Raleigh $77 roundtrip

Cincinnati to New York $79 roundtrip

Austin to Santa Ana $79 roundtrip

Sacramento to Denver $79 roundtrip

Chicago to Las Vegas $80 roundtrip

Seattle to Austin $82 roundtrip

Denver to Atlanta $84 roundtrip

Columbus to Denver $84 roundtrip

Indianapolis to Las Vegas $84 roundtrip

Cleveland to San Diego $84 roundtrip

Nashville to Las Vegas $84 roundtrip

Denver to Seattle $84 roundtrip

Tampa to Las Vegas $86 roundtrip

Chicago to Phoenix $87 roundtrip

Milwaukee to San Diego $89 roundtrip

Detroit to Denver $90 roundtrip

Cincinnati to Los Angeles $94 roundtrip

Raliegh to San Diego $94 roundtrip

Washington D.C. to Las Vegas $94 roundtrip

Philadelphia to Denver $102 roundtrip

Denver to Providence $102 roundtrip

Las Vegas to Orlando $104 roundtrip

Atlanta to San Juan $114 roundtrip

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

Keep in mind that Frontier charges extra for any bags larger than a small personal item (small backpack, 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.

Above image by Colin A. Pierce via Shutterstock.