AirHint found the following cheapest return flights from Waterloo (YKF) to Barcelona (BCN) in September 2025 (see full year).

Return flights

12 Sep - 17 Sep	WestJet
02 Sep - 10 Sep	WestJet
03 Sep - 17 Sep	WestJet
11 Sep - 20 Sep	WestJet
05 Sep - 14 Sep	WestJet
30 Sep - 12 Oct	WestJet
05 Sep - 13 Sep	WestJet
13 Sep - 20 Sep	WestJet
30 Sep - 15 Oct	WestJet
30 Sep - 19 Oct	WestJet
08 Sep - 15 Sep	WestJet
09 Sep - 21 Sep	WestJet
09 Sep - 27 Sep	WestJet
10 Sep - 08 Oct	WestJet
17 Sep - 10 Oct	WestJet
16 Sep - 11 Oct	WestJet

Also check the deals for one-way flights from Waterloo to Barcelona 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 Waterloo to Barcelona in September from $800

Return flights