Haven't booked that spring break trip yet? You're in luck! Fly nonstop from Denver to Cancun for $170 round-trip on Frontier for spring break! We're also seeing slightly higher fares from a number of other cities on all of Frontier's international flights.

Seen below, we found seats departing Denver DEN on Monday, March 19, returning from Cancun CUN on Monday, March 26.

Other dates are available for travel as early as next week, from February 12 through April 5. If you would rather not fly Frontier, we're seeing a few scattered dates with slightly higher fares on American.

Don't live near Denver? No problemo! We're seeing low fares on all of Frontier's international flights for spring break travel. Fares can be found on Mondays, Tuesdays, Wednesdays, and Thursdays, starting next week through early April. These are unadvertised so there is no telling when fares will go back up in price. We rarely see these prices for spring break travel. Not all routes are operated daily so be sure to check out the fare details for specifics.

Denver to Cancun $170 round-trip, nonstop

Chicago to Cancun $170 round-trip, nonstop

Philadelphia to Cancun $210 round-trip, nonstop

Cleveland to Cancun $210 round-trip, nonstop

Philadelphia to Punta Cana $224 round-trip, nonstop

Denver to Puerto Vallarta $233 round-trip, nonstop

Denver to Cabo San Lucas $235 round-trip, nonstop

Cincinnati to Cancun $250 round-trip, nonstop

St. Louis to Cancun $250 round-trip, nonstop

Chicago to Puerto Vallarta $253 round-trip, nonstop

Chicago to Punta Cana $264 round-trip, nonstop

Kansas City to Cancun $270 round-trip, nonstop

Chicago to Cabo San Lucas $275 round-trip, nonstop

Keep in mind, Frontier charges for any bags larger than one personal item (small backpack, purse, etc.). Pack a swim suit and hit the beach, or buy bags when you book, so you can bring your boogie board. Checked bag fees start at $25 each way.

If you don't see your city listed, we still have plenty of deals, on all airlines, to spring break hot spots over on our fare pages to Cancun, Punta Cana, Puerto Vallarta, and Cabo San Lucas. Also, check out 10 Cheap Trips for Spring Break 2018, if you're looking for some travel inspiration.

Need a room in Cancun? Here's what's available for the above dates on Hotelwatchdog.

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