Are there nonstop flights from Cancún (CUN) to San José (SJO)?

Yes. Volaris, Volaris Costa Rica fly this route. Flight time is about 1h 59m.

What is the fastest connection from Cancún (CUN) to San José (SJO)?

via San Salvador ≈ 2h 48m, via Guatemala City ≈ 2h 58m, via Panama City ≈ 3h 28m (estimated flying time, excluding layovers).

from 15,000 JAL miles, from 30,000 ANA miles (economy, one way, based on the published award charts).

Cancún International Airport (CUN) to Juan Santamaría International Airport (SJO)・1,261 km

Nonstop flights available (2 airlines). Flight time about 1h 59m. Nonstop return flights also operate.

With milesJAL 15,000 miles+ (via MIA)ANA 30,000 miles+ (via PTY)Economy, one way, estimate. Tap a connection for miles by cabin.

6 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.