Take up to 90% off your next Frontier flight for travel through mid-December. Fares start at just $45 roundtrip.

Although these promo code sales have been popping up fairly often lately, this is a rare promo code sale that includes discounted travel on Sundays and Fridays.

Use promo code AUTUMN when booking on FlyFrontier.com to take 90% off the base fare for nonstop domestic flights on Tuesdays, Wednesdays, Thursdays, and Saturdays, through December 15, 2018. Travel on Sundays, Mondays, and Fridays, may also be discounted 35% off. An advanced purchase of 3-days is required and blackout dates apply November 12, and 17-27, 2018.

The discount does not apply to taxes nor Frontier's online booking fee, which is labeled a "Carrier Interface Charge". This means some routes still won't have a very big price drop even with the big sticker shock of 90% off. However, there are plenty of routes where we are seeing some big price drops. The discount can also be applied to one-way flights.

If you are unfamiliar with Frontier Airlines, please read our guide on Everything You Need to Know Before You Fly Frontier.

There are specific routes excluded from this promo code sale. Some may only be discounted for certain days of the week. You may have to click around to find available dates since Frontier operates about half of the route network on 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 11:59 pm ET, October 26, 2018.

A sample of nonstop fares include:

Greenville to Orlando $45 roundtrip, nonstop

Charlotte to Orlando $49 roundtrip, nonstop

Minneapolis to Ft. Myers $69 roundtrip, nonstop

Philadelphia to West Palm Beach $70 roundtrip, nonstop

Syracuse to Orlando $71 roundtrip, nonstop

Minneapolis to Tampa $71 roundtrip, nonstop

St. Louis to Las Vegas $71 roundtrip, nonstop

Portland, ME to Orlando $72 roundtrip, nonstop

Minneapolis to Denver $72 roundtrip, nonstop

Columbus to Denver $73 roundtrip, nonstop

Chicago to Miami $75 roundtrip, nonstop

Washington D.C. to Las Vegas $77 roundtrip, nonstop

Atlanta to Los Angeles $77 roundtrip, nonstop

Denver to Miami $77 roundtrip, nonstop

Raleigh to Las Vegas $78 roundtrip, nonstop

Cincinnati to Los Angeles $78 roundtrip, nonstop

These fares all work in reverse and there are many more routes available as well. 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-$30 each way. Larger carry-on bag fees start at $30-$35 each way.

If you want to avoid all extra fees, read How to Pack in Just a Personal Item Sized Bag.

Above image by Colin A. Pierce via Shutterstock.

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