United has round-trip flights from Portland (PDX) to Liberia, Costa Rica (LIR) for $315-$329 with a connection. Flights January to September. Weekends available.
Costa Rica has additional entry requirements due to COVID. You must complete the online Health Assessment and you must purchase travel insurance. Details on this process is on visitcostarica.com.
Change fees are waived, but United’s “Basic Economy” fares do not include a free carry-on bag. Only a personal item (like a small laptop bag) is free. Seats are randomly assigned for free prior to boarding.
The personal item size on United flights is smaller (9-in/10-in/17-in) than Frontier or Spirit (8-in/14-in/18-in).
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Click for more details and booking links Cheap Flights: Portland to Liberia, Costa Rica $315-$329 r/t [January-September] – United