Are there nonstop flights from Castellón de la Plana (CDT) to Oslo (OSL)?

No. The fastest connection is via London, about 3h 53m of total flying time.

What is the fastest connection from Castellón de la Plana (CDT) to Oslo (OSL)?

via London ≈ 3h 53m, via Bilbao ≈ 3h 58m, via Berlin ≈ 4h 2m (estimated flying time, excluding layovers).

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

Castellón-Costa Azahar Airport (CDT) to Oslo-Gardermoen International Airport (OSL)・2,349 km

No nonstop flights. The fastest connection is via London (STN), about 3h 53m of flying time (layover not included).

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

None.

14 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.