AirHint found the following cheapest return flights from Ontario (ONT) to Vienna (VIE) in August 2025 (see full year).

Return flights

25 Aug - 18 Sep	Iberia
25 Aug - 25 Sep	Iberia
07 Aug - 21 Aug	Iberia
29 Aug - 06 Sep	Iberia
14 Aug - 17 Aug	Iberia
07 Aug - 17 Aug	Condor
07 Aug - 18 Aug	Condor
06 Aug - 13 Aug	Condor
26 Aug - 04 Sep	Iberia
26 Aug - 09 Sep	Iberia
26 Aug - 26 Sep	China Airlines

Also check the deals for one-way flights from Ontario to Vienna 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.

Book a cheap hotel in Vienna

Cheap car rent in Vienna

Cheapest return flights from Ontario to Vienna in August from $752

Return flights