How to say good morning, goodnight, and goodbye in Thai

The textbook way to say good morning in Thai is arun sawat (อรุณสวัสดิ์), but almost nobody says it out loud — Thais use sawasdee at any hour instead. Goodnight has the same split: raatree sawat (ราตรีสวัสดิ์) is the formal version, while fan dee (ฝันดี), "sweet dreams," is what people actually say.

Good morning in Thai: arun sawat vs. what Thais actually say

Arun sawat (อรุณสวัสดิ์) literally combines arun (dawn) with sawat (a well-being root related to sawasdee) — a real phrase, correct on paper, and one you'll mostly meet in greeting cards, formal writing, or a Thai class rather than in conversation. In daily life, Thai simply doesn't split greetings by time of day the way English does: sawasdee khrap/kha works whether it's 7am or 7pm, so that's what people actually say when they run into you in the morning. How to say hello in Thai covers sawasdee and the gender particle in more depth if you're starting from zero.

If you want to specifically flag that it's morning, adding the time isn't really how Thai handles it — sawasdee alone does the job, and reaching for arun sawat will read as unusually formal or slightly bookish, similar to opening an email with "greetings and salutations" instead of "hi."

Good night in Thai: raatree sawat and fan dee

Raatree sawat (ราตรีสวัสดิ์) is the formal "good night," built the same way as arun sawat — a real phrase, but one that shows up in writing and formal speech more than at the end of an ordinary evening. What Thai people actually say to each other before bed is fan dee (ฝันดี), which literally means "dream well." It's short, warm, and genuinely common — the phrase a parent says to a kid, or one partner texts another before sleep.

Goodbye in Thai: la kon vs. laeo jer gan vs. bye bye

La kon (ลาก่อน) is the phrase most textbooks teach for goodbye, and it's technically correct — but it carries a note of finality, closer to "farewell" than a casual "see you." Using it to leave a coffee shop or end a normal hangout can sound oddly dramatic, like announcing you're departing for a long journey.

What Thai people say instead, day to day, is laeo jer gan (แล้วเจอกัน) — "see you later" or "see you then" — or simply bye bye, borrowed directly from English and used constantly in casual speech, especially among younger Thais. Either is a safe, natural way to end an ordinary interaction; save la kon for genuinely final goodbyes, or for the movies, where you'll hear it a lot.

Textbook Thai vs. everyday Thai

A pattern runs through all three of these: the "correct," full phrase exists and is understood, but casual daily Thai reaches for something shorter and less formal almost every time.

Situation	Textbook phrase	What's actually said
Good morning	Arun sawat	Sawasdee (any time of day)
Good night	Raatree sawat	Fan dee ("dream well")
Goodbye	La kon	Laeo jer gan / bye bye

This gap between the phrasebook version and the spoken version is common in a lot of languages, but it's especially pronounced in Thai greetings — which is worth knowing before you memorize a phrase and then never hear it used the way you learned it.

Hearing the difference between the formal and casual versions — and which one a Thai speaker would actually reach for — is easier by ear than from a page. Thai Phrasebook, an offline Thai phrasebook app with 700+ real-world phrases across 16 categories, plays both registers as native audio at full and slow speed, with nuance notes on which version fits which situation.

FAQ

Do Thai people actually say arun sawat for good morning?

Rarely in speech. It's a real, correct phrase you'll see in writing or hear in formal contexts, but the everyday greeting at any hour — including the morning — is simply sawasdee khrap/kha.

What's the most natural way to say goodbye in Thai?

Laeo jer gan ("see you later") or bye bye, both used constantly in casual conversation. La kon is understood but sounds more formal and final than most everyday goodbyes call for.

Is fan dee only for children?

No — it's used across ages, from parents to kids, but just as commonly between partners, friends, and family members of any age. It's simply the normal, warm way to say goodnight, not a phrase reserved for children specifically.

Can I just use sawasdee for both hello and goodbye?

Sawasdee is understood as a hello-type greeting rather than a farewell, so while some people do stretch it both ways in casual moments, laeo jer gan or bye bye is the more accurate and more commonly heard way to actually part ways.