AirHint found the following cheapest return flights from Denver (DEN) to Madrid (MAD) in May 2026 (see full year).

Return flights

12 May - 25 May	Air France
17 May - 29 May	Iberia
07 May - 14 May	Iberia
09 May - 17 May	Air France
01 May - 11 May	Air Canada
16 May - 30 May	Air France
21 May - 04 Jun	United
21 May - 05 Jun	Air Canada
12 May - 19 May	Iberia
02 May - 09 May	Iberia
21 May - 30 May	Air Canada
30 May - 13 Jun	Air Canada
17 May - 24 May	Iberia
27 May - 03 Jun	Iberia

Also check the deals for one-way flights from Denver to Madrid in May.

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 Denver to Madrid in May from $566

Return flights