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

Return flights

08 Sep - 25 Sep	KLM
15 Sep - 29 Sep	KLM
10 Sep - 09 Oct	KLM
16 Sep - 14 Oct	KLM
03 Sep - 02 Oct	KLM
11 Sep - 09 Oct	Air France
14 Sep - 05 Oct	Air France
14 Sep - 01 Oct	Air France
19 Sep - 29 Sep	Air France
07 Sep - 04 Oct	Air France
23 Sep - 21 Oct	Air France
19 Sep - 10 Oct	Ryanair
22 Sep - 20 Oct	KLM
02 Sep - 16 Sep	KLM
04 Sep - 21 Sep	KLM
16 Sep - 28 Sep	KLM
12 Sep - 22 Sep	Air France
08 Sep - 14 Sep	KLM
03 Sep - 17 Sep	KLM
10 Sep - 27 Sep	Air France

Also check the deals for one-way flights from Newcastle 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 Newcastle to Bangkok in September from $731

Return flights