AirHint found the following cheapest one-way flights from Washington (IAD) to Madrid (MAD) in June 2025 (see full year).

One-Way flights

30 Jun	Icelandair
24 Jun	Icelandair
29 Jun	Porter Airlines (Canada) Ltd
25 Jun	Icelandair
27 Jun	Frontier Airlines
18 Jun	Royal Air Maroc
25 Jun	United	direct
29 Jun	United	direct
27 Jun	United	direct
30 Jun	United	direct

Also check the deals for return flights from Washington to Madrid in June.

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 one-way flights from Washington to Madrid in June from $434

One-Way flights