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

Return flights

30 Sep - 22 Oct	Turkish Airlines
01 Sep - 10 Sep	Korean Air
01 Sep - 15 Sep	Korean Air
09 Sep - 21 Oct	Turkish Airlines
17 Sep - 24 Sep	Delta
01 Sep - 17 Sep	Delta
16 Sep - 23 Sep	Korean Air
18 Sep - 24 Sep	Korean Air
30 Sep - 28 Oct	Korean Air
04 Sep - 17 Sep	Delta
04 Sep - 25 Sep	Delta
10 Sep - 24 Sep	Delta
08 Sep - 15 Sep	Delta
29 Sep - 07 Oct	Korean Air
22 Sep - 12 Oct	Air India
26 Sep - 10 Oct	Turkish Airlines
09 Sep - 13 Oct	Korean Air
30 Sep - 18 Oct	Air India
21 Sep - 13 Oct	Korean Air
09 Sep - 01 Oct	ANA

Also check the deals for one-way 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 return flights from Newark to Bangkok in September from $694

Return flights