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

Return flights

04 Sep - 17 Sep	Delta
01 Sep - 08 Sep	Delta
03 Sep - 17 Sep	Delta
11 Sep - 18 Sep	Delta
09 Sep - 16 Sep	Delta
10 Sep - 17 Sep	Delta
04 Sep - 16 Sep	Delta
09 Sep - 17 Sep	Delta
01 Sep - 16 Sep	Delta
16 Sep - 14 Oct	Delta
23 Sep - 14 Oct	Delta
01 Sep - 07 Sep	Delta
29 Sep - 06 Oct	Delta
18 Sep - 06 Oct	Delta
21 Sep - 13 Oct	Delta
02 Sep - 02 Oct	ANA
21 Sep - 06 Oct	Delta
30 Sep - 04 Oct	Air India
30 Sep - 07 Oct	Spirit Airlines
20 Sep - 01 Oct	Spirit Airlines

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 643€

Return flights