Mexicana is having a flight sale to Guadalajara from Los Angeles and the Bay Area for as low as $112 (before taxes). Book and travel by January 31.

However, we’re seeing good unadvertised fares with Mexicana, including New York to Guatemala City (see below) for only $254 (after taxes).

Surprisingly, this rate is valid deep into 2010. Since, this is unadvertised, prices could jump at any moment, so act fast.

Please conduct a search for your flight with our searchbox above!

Taca Airlines, which last Fall announced its merger with Avianca to become the 2nd largest airline in South America, is offering flights from Chicago’s O’Hare to its hub in San Jose, Costa Rica for under $300.

In fact, we just found a flight itinerary for April travel for only $233 (see below). This is extremely cheap for an international flight of this distance.

Prices may be steeper on Taca’s site, so as always, search multiple travel sites. We found our $233 itinerary on Orbitz.

Mexicana and American Airlines are also offering sub-$300 fares from Chicago to San Jose through August.

Good luck.