Here's some amazing summer deals on Frontier. Around 40 routes have dropped to just $20 each way ($39 roundtrip) for summer travel. Many more routes are available for under $100 roundtrip.

Availability is limited so you must be somewhat flexible to find the lowest price. Travel days will vary by route, but generally fares are available between June 28 and September 15. Many routes 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 June 26, or before seats sell out.

Nonstop fares include:

Boise to Denver $34 roundtrip

Denver to Las Vegas $39 roundtrip

Salt Lake City to Las Vegas $39 roundtrip

San Francisco to Las Vegas $39 roundtrip

Atlanta to Orlando $39 roundtrip

Nashville to Philadelphia $39 roundtrip

Cincinnati to Philadelphia $39 roundtrip

Philadelphia to Indianapolis $39 roundtrip

Raleigh to Orlando $39 roundtrip

Denver to Salt Lake City $39 roundtrip

Detroit to Long Island-Islip $39 roundtrip

Orlando to New Orleans $39 roundtrip

Philadelphia to Madison $39 roundtrip

Albuquerque to Austin $39 roundtrip

Denver to Albuquerque $39 roundtrip

Chicago to Pensacola $39 roundtrip

New Orleans to San Antonio $39 roundtrip

Trenton to Myrtle Beach $39 roundtrip

These fares all work in reverse and there are many more routes between $57-$97 roundtrip as well. Check flights from your city to see all of today's finds.

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-$30 each way. Larger carry-on bag fees start at $30-$35 each way.

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