Saudia is a major international airline with a perfectly good safety record, you shouldnβt have any trouble.
A few caveats to be aware of:
Saudia is a completely dry airline. Alcohol is not served, and you canβt bring any in your luggage. The same goes for other things that are banned in Saudi Arabia like pork products. This question has more details.
If you have an Israeli passport or any evidence of travel to Israel in your passport (including relevant stamps from the Israeli borders with Egypt or Jordan), you probably wonβt be allowed to fly.