If you're in line with the polar vortex, jump on one of these hot fares from Frontier's latest "buck" sale. Base fares of $1 each way add up to $39 (or lower) roundtrip after taxes and booking fees. Fares can also be bought one-way for just $20. This weeks sale has more routes than last week with around 40 routes priced this low. Many more routes are available for under $100 roundtrip.

If you're unfamiliar with Frontier Airlines and how this ultra-low-cost carrier differs from other airlines, read up on Everything You Need to Know Before You Fly Frontier.

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 on scattered dates through early March, with a 7-day advance purchase required.

Most of these routes are only flown a few times each week so be sure to check out the specifics in the fare details on your route.

Tickets must be booked by 11:59 pm ET, February 1, 2019, or before seats sell out.

Nonstop fares include:

Greenville to Tampa $34 roundtrip

Atlanta to Miami $39 roundtrip

San Francisco to Las Vegas $39 roundtrip

San Jose to Las Vegas $39 roundtrip

Atlanta to Orlando $39 roundtrip

Kansas City to Denver $39 roundtrip

Sacramento to Las Vegas $39 roundtrip

Norfolk to Tampa $39 roundtrip

Philadelphia to Charleston $39 roundtrip

Raleigh to West Palm Beach $39 roundtrip

Orlando to Birmingham $39 roundtrip

Orlando to Huntsville $39 roundtrip

Lafayette to Orlando $39 roundtrip

St. Louis to Jacksonville $39 roundtrip

Oklahoma City to Denver $39 roundtrip

Denver to Wichita $39 roundtrip

Denver to Tulsa $39 roundtrip

Denver to Palm Springs $39 roundtrip

Denver to Reno $39 roundtrip

Trenton to Jacksonville $39 roundtrip

Calgary to Denver $106 CAD roundtrip ($80 USD)

These fares all work in reverse as well. 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, purse, etc.). Pack super light to get the lowest price. Checked bag fees start at $30 each way. Larger carry-on bag fees start at $35 each way.

For a complete look at baggage fees on all airlines, check out our Bag Fee Chart.

As an example booking, I found seats departing Denver DEN on Friday, February 8, returning from Palm Springs PSP on Friday, February 15, for $39 roundtrip.

Featured image via Shutterstock.

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