Frontier is having a good sale on most of its international flights to Mexico and the Caribbean. Fares start at just $159 roundtrip.

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

Travel is valid through March 6, 2019, with a 7-day advanced purchase required. There are no advertised blackout dates, but peak travel around the holidays will be more expensive. Most routes are only flown on a few days each week so be sure to click on the fare details for more booking info.

Tickets must be booked by 11:59 pm ET, on November 2, 2018.

Nonstop fares include:

Chicago to Cancun $159 roundtrip

Denver to Cancun $159 roundtrip

Raleigh to Cancun $159 roundtrip

Las Vegas to Cancun $159 roundtrip

Raleigh to Punta Cana $175 roundtrip

Raleigh to Montego Bay $189 roundtrip

Philadelphia to Cancun $199 roundtrip

Cleveland to Cancun $199 roundtrip

Cincinnati to Cancun $199 roundtrip

Denver to Puerto Vallarta $200 roundtrip

Philadelphia to Punta Cana $215 roundtrip

Las Vegas to Cabo San Lucas $217 roundtrip

Chicago to Puerto Vallarta $240 roundtrip

Kansas City to Cancun $261 roundtrip

St. Louis to Cancun $297 roundtrip

Philadelphia to Montego Bay $309 roundtrip

Cleveland to Punta Cana $375 roundtrip

Cincinnati to Punta Cana $395 roundtrip

St. Louis to Punta Cana $405 roundtrip

Chicago to Punta Cana $425 roundtrip

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

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

As an example booking, I found seats departing Raleigh RDU on Sunday, December 30, returning from Cancun CUN on Tuesday, January 8, for $159 roundtrip.

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