United and Alaska Airlines has round-trip flights from Los Angeles (LAX) to Liberia, Costa Rica (LIR) for $274-$344, NONSTOP. Flights February, March, April, May, August, September, October, November, and December. Weekends available. Origin/Destination reversible. Holiday blackouts.
For the cheapest fare on Alaska Airlines – You must use the Alaska Airlines coupon-code “THANKYOU30” and you must fly in February and March. This is a 30% off coupon-code. Other destinations are also on sale, but with with savings that aren’t that much less than the 6-month moving average. These types of coupons are common on Alaska Airlines.
For the cheapest fare on United – Use Google Flights. No coupon required, but availability is very limited.
A Carry-on bag and also a personal item is allowed for free on Alaska Airlines. You can avoid paying for seat selection by accepting the randomly assigned seat at the gate.
Click for more details and booking links Nonstop Flights: Los Angeles to/from Liberia, Costa Rica $274-$344 r/t [Feb-Mar / Apr-May, Aug-Dec] (No Christmas / Thanksgiving) – Alaska Airlines / United