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

Return flights

10 Sep - 24 Sep	United
04 Sep - 30 Sep	United
02 Sep - 23 Sep	United
11 Sep - 18 Sep	United
11 Sep - 23 Sep	United
03 Sep - 09 Sep	United
08 Sep - 18 Sep	United
18 Sep - 25 Sep	United
10 Sep - 22 Sep	Delta
09 Sep - 15 Sep	Delta
24 Sep - 09 Oct	United
21 Sep - 06 Oct	United
20 Sep - 01 Oct	United
26 Sep - 08 Oct	Air India
24 Sep - 08 Oct	SWISS
09 Sep - 01 Oct	SWISS
01 Sep - 17 Oct	SWISS
18 Sep - 02 Oct	SWISS
25 Sep - 15 Oct	SWISS

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 631€

Return flights