AirHint found the following cheapest return flights from Madrid (MAD) to Asuncion (ASU) in September 2026 (see full year).
Return flights
| 30 Sep - 08 Oct | Air Europa | direct | |
| 01 Sep - 19 Sep | Air Europa | direct | |
| 01 Sep - 03 Oct | Air Europa | direct |
Also check the deals for one-way flights from Madrid to Asuncion in September.
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