Best I could find for Oct 26-Nov 1 (Thurs to Wed, non-holiday) on Continental was $431 + $74 taxes and fees.
Keep in mind you'll be going via Houston or Newark in both directions and the flight is anywhere from 7 to 10.25 hours.
ATL to SJO direct on Delta in 4 hours is tough to beat. Of course you pay for that privilege ($567 inc taxes and fees).
Good thing I had enough SkyMiles for my next 3 trips.
I found this on his website:
http://clarkhoward.com/shownotes/category/10/355/#intl
#
More Carib & Latin specials
Purchase these round-trip deals through Sept. 30:
# $347 San Jose, Costa Rica
# $410 Liberia, Costa Rica
Valid from Aug. 15 with travel to be completed on or by Nov. 15.
Add $25 per per direction for Fri.-Sun. travel. Stay 3-30 days. Valid on American.
#
Low Latin deals
Purchase these round-trip deals by July 14:
# $325 Liberia or
San Jose, Costa Rica
No advance purchase required. Travel any available day. Stay 3-30 days. Complete travel by Sept. 30. Valid on American.
Add $60 each way fuel surcharge.
What I want to know is, how is Delta going to fly a 737 down to SJO on Oct 31st (one flight at 10:45AM only) and return it at 2PM yet they also have a return at 9AM on Nov. 1st in a 757? Are they dead-heading an empty plane down there? Interesting.