Are there nonstop flights from Muscat (MCT) to Colombo (CMB)?

Yes. SalamAir fly this route. Flight time is about 3h 58m.

What is the fastest connection from Muscat (MCT) to Colombo (CMB)?

via Kochi ≈ 4h 28m, via Thiruvananthapuram ≈ 4h 29m, via Tiruchirappalli ≈ 4h 33m (estimated flying time, excluding layovers).

from 23,000 JAL miles (economy, one way, based on the published award charts).

Muscat International Airport (MCT) to Bandaranaike International Colombo Airport (CMB)・2,940 km

Nonstop flights available (1 airline). Flight time about 3h 58m. Nonstop return flights also operate.

With milesJAL 23,000 miles+ (via DXB)Economy, one way, estimate. Tap a connection for miles by cabin.

21 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.