Frontier is back with more $39 round-trip fares and has over 100 routes priced between $39-$97 round-trip for travel through mid-May.

Availability is limited so you must be somewhat flexible to find the lowest price. Travel days will vary by route, but fares are generally available for travel through May 9. Many routes start service the second week of April and have limited frequencies so be sure to check out the specifics in the fare details on your route.

Tickets must be booked by 11:59 pm ET, on March 21.

A sample of nonstop fares include:

Denver to Las Vegas $39 round-trip

Cincinnati to Atlanta $39 round-trip

Atlanta to Orlando $39 round-trip

Cleveland to Raleigh $39 round-trip

Grand Rapids to Philadelphia $39 round-trip

Houston to Raleigh $39 round-trip

Denver to Salt Lake City $39 round-trip

Detroit to Long Island-Islip $39 round-trip

Chicago to Long Island-Islip $39 round-trip

Birmingham to Philadelphia $39 round-trip

Chicago to Colorado Springs $39 round-trip

Philadelphia to Houston $57 round-trip

Atlanta to Long Island-Islip $57 round-trip

Buffalo to Raleigh $57 round-trip

Providence to Tampa $57 round-trip

Minneapolis to Trenton $57 round-trip

Charlotte to Philadelphia $66 round-trip

Atlanta to Las Vegas $67 round-trip

Madison to Philadelphia $67 round-trip

Long Island-Islip to San Juan $68 round-trip

New York to Cincinnati $77 round-trip

Oklahoma City to San Diego $77 round-trip

Kansas City to Raleigh $83 round-trip

Atlanta to Colorado Springs $87 round-trip

Denver to Palm Springs $97 round-trip

Trenton to Jacksonville $97 round-trip

These fares all work in reverse and there are many more routes priced between $39-$97 or in the $100-$197 round-trip range as well. Keep in mind that Frontier charges extra for any bags larger than a small personal item (small backpack, purse, etc.). Pack super light to get the lowest price. Checked bag fees start at $25 each way. 

Frontier also has a promo code for travel to Florida or Las Vegas. Using the promo code SAVE75 on will discount travel to Florida or Las Vegas on Sundays, Mondays, Tuesdays, and Wednesdays, from April 3 through May 9. Promo code expires at 11:59 pm ET, on March 21.

Flights from Florida or Las Vegas will not be discounted so you'll only see a price drop in one direction if you're traveling round-trip. Also, 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. As always, Frontier has a long list of specific routes that are excluded from the promo code sale. 

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