Formal:
* ยินดีต้อนรับกลับบ้าน (yin di ton rap klap baan) - This is the most formal and literal translation, meaning "Welcome back home".
Informal:
* กลับบ้านดีไหม (klap baan di mai) - This translates to "Did you have a good trip home?" It's a more casual way to greet someone returning home.
* กลับมาแล้วเหรอ (klap ma laeo reu) - This means "You're back?" and is used among friends and family.
Other options:
* ยินดีต้อนรับกลับ (yin di ton rap klap) - This means "Welcome back" and can be used for someone returning from a trip, not just home.
You can also use the phrase บ้าน (baan) to refer to "home" in any of these expressions. For example:
* ยินดีต้อนรับกลับบ้าน (yin di ton rap klap baan)
* กลับบ้านดีไหม (klap baan di mai)
Ultimately, the best way to say "Welcome home" in Thai depends on your relationship with the person you're speaking to.