Are there nonstop flights from Riyadh (RUH) to Istanbul (SAW)?

Yes. Pegasus Airlines, AJet, Flynas fly this route. Flight time is about 3h 19m.

What is the fastest connection from Riyadh (RUH) to Istanbul (SAW)?

via Antakya ≈ 3h 50m, via Aleppo ≈ 3h 50m, via Damascus ≈ 3h 50m (estimated flying time, excluding layovers).

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

King Khalid International Airport (RUH) to Istanbul Sabiha Gökçen International Airport (SAW)・2,394 km

Nonstop flights available (3 airlines). Flight time about 3h 19m. Nonstop return flights also operate.

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

37 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.