AirHint found the following cheapest one-way flights from Newark (EWR) to Bangkok (BKK) in September 2025 (see full year).

One-Way flights

25 Sep	Spirit Airlines
22 Sep	Spirit Airlines
15 Sep	Spirit Airlines
08 Sep	Spirit Airlines
24 Sep	Spirit Airlines
02 Sep	Korean Air
03 Sep	Korean Air
04 Sep	Korean Air
30 Sep	Korean Air
18 Sep	Korean Air

Also check the deals for return flights from Newark to Bangkok in September.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest one-way flights from Newark to Bangkok in September from $363

One-Way flights