AirHint found the following cheapest return flights from Lisbon (LIS) to Tbilisi (TBS) in September 2025 (see full year).

Return flights

18 Sep - 22 Sep	easyJet
22 Sep - 29 Sep	easyJet
16 Sep - 03 Oct	TAP
11 Sep - 17 Sep	easyJet
23 Sep - 02 Oct	easyJet
16 Sep - 04 Oct	TAP
16 Sep - 02 Oct	TAP
26 Sep - 08 Oct	easyJet
09 Sep - 20 Sep	easyJet
23 Sep - 29 Sep	TAP
04 Sep - 10 Sep	TAP
01 Sep - 07 Sep	Ryanair
22 Sep - 13 Oct	Fly One
01 Sep - 22 Sep	Fly One
08 Sep - 29 Sep	Fly One
08 Sep - 22 Sep	Fly One
22 Sep - 01 Oct	Fly One
20 Sep - 01 Oct	Fly One
22 Sep - 04 Oct	Fly One
20 Sep - 04 Oct	Fly One

Also check the deals for one-way flights from Lisbon to Tbilisi 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 Lisbon to Tbilisi in September from 263€

Return flights