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

Return flights

01 Sep - 08 Sep	Air India
01 Sep - 30 Sep	Air India
01 Sep - 23 Sep	Air India
01 Sep - 01 Oct	Air India
23 Sep - 30 Sep	Air India
02 Sep - 09 Sep	United
23 Sep - 07 Oct	Air India
18 Sep - 24 Sep	United
23 Sep - 12 Oct	Air India
11 Sep - 23 Sep	United
08 Sep - 13 Sep	Air India
27 Sep - 30 Sep	Air India
05 Sep - 21 Sep	Air India
30 Sep - 14 Oct	ANA
30 Sep - 20 Oct	ANA
23 Sep - 28 Oct	Delta
27 Sep - 09 Oct	Air India
19 Sep - 31 Oct	Air India
19 Sep - 03 Oct	Air India
21 Sep - 02 Oct	United

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 $735

Return flights