Spirit Airlines is having a decent promo code sale for travel Tuesday. Take up to 75% off the base fare for travel this winter. Fares start at just $63 roundtrip.

Just enter promo code 75PCT when booking on Spirit.com to apply up to a 75% discount to the base fare for roundtrip travel on Tuesdays and Wednesdays, from December 4-12, 2018, and January 9 through February 12, 2019.

The discount will only apply to the base fare and not to taxes nor Spirit's booking fees so don't expect to see that large of a price drop on certain routes. There is also a list of excluded markets for this sale. However, I'm finding that if you search directly from the sale page, all routes are being discounted, even if they are listed as excluded.

If you are unfamiliar with Spirit, please read our guide on How to Fly Spirit Airlines (and Actually Enjoy the Experience).

Promo code expires at 11:59 pm ET, tonight, November 27, 2018.

A sample of fares include:

Houston to Denver $63 roundtrip, nonstop

Boston to Baltimore $64 roundtrip, nonstop

Detroit to Kansas City $65 roundtrip, nonstop

Chicago to Houston $65 roundtrip, nonstop

Oakland to Los Angeles $65 roundtrip, nonstop

Dallas to Phoenix $106 roundtrip, nonstop

Detroit to New York $108 roundtrip, nonstop

Houston to San Diego $108 roundtrip, nonstop

Baltimore to Houston $110 roundtrip, nonstop

Newark to Houston $110 roundtrip, nonstop

Detroit to Houston $111 roundtrip, nonstop

Phoenix to Fort Lauderdale $118 roundtrip

Boston to Oakland $120 roundtrip

Seattle to Orlando $129 roundtrip

Oakland to Fort Lauderdale $136 roundtrip

Orlando to San Juan $136 roundtrip, nonstop

Fort Lauderdale to San Juan $143 roundtrip, nonstop

Columbus to Aquadilla $210 roundtrip

Minneapolis to St. Thomas $231 roundtrip

Detroit to Montego Bay $256 roundtrip, nonstop

Routes listed as excluded, but are discounting if you search directly from the sale page. This bug may be corrected at any time.

Dallas to Fort Lauderdale $107 roundtrip, nonstop

Orlando to Las Vegas $111 roundtrip, nonstop

Fort Lauderdale to Cali, Colombia $222 roundtrip, nonstop

Denver to Guatemala $262 roundtrip

Dallas to Cartagena $270 roundtrip

Cleveland to Panama $294 roundtrip

New York to Managua $299 roundtrip

There are many more routes available as well. Domestic routes will work in reverse. Lowest fares may not be available for the entire travel period. You'll have to decline any extras to get the lowest price.

Spirit's Bare Fares only include one small personal item (small backpack, large purse, briefcase, etc.) that will fit underneath your seat. Checked baggage starts at $30-$35 each way. Larger carry-on bag fees start at $35-$40 each way.

As an example booking, after searching directly from the sale page and entering promo code SAVE75, I found seats departing Fort Lauderdale FLL on Wednesday, January 24, returning from Cali CLO on Tuesday, January 29, for $222 roundtrip.

Header image courtesy of Spirit.