AirHint found the following cheapest return flights from Austin (AUS) to Porto (OPO) in August 2026 (see full year).

Return flights

12 Aug - 19 Aug	Air Canada
11 Aug - 18 Aug	Air Canada
13 Aug - 20 Aug	Air Canada
04 Aug - 11 Aug	Air Canada
05 Aug - 12 Aug	Air Canada
15 Aug - 22 Aug	Air Canada
06 Aug - 13 Aug	Air Canada
14 Aug - 21 Aug	British Airways
10 Aug - 17 Aug	British Airways
09 Aug - 16 Aug	Air Canada

Also check the deals for one-way flights from Austin to Porto in August.

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 Austin to Porto in August from 484€

Return flights