飛行機代(ひこうきだい)も安(やす)いことだし天気(てんき)もいいから沖縄(おきなわ)に行(い)こうよ。
Since plane tickets are cheap and the weather is nice, let's go to Okinawa.
Unlike し, ことだし is usually not repeated, but can still be used to state more than one reason/cause directly with expressions like から/ので and the like