Cheapest return flights from Washington to Barcelona in September from $432

Best time to book flights for Washington (IAD) to Barcelona (BCN) flights at AirHint

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

Return flights

23 Sep - 30 Sep Lufthansa
24 Sep - 01 Oct Air Canada
30 Sep - 07 Oct United direct
11 Sep - 17 Sep Icelandair
09 Sep - 17 Sep Icelandair
11 Sep - 15 Sep Icelandair
13 Sep - 20 Sep Icelandair
16 Sep - 20 Sep Icelandair
17 Sep - 24 Sep United
09 Sep - 17 Sep United direct
02 Sep - 09 Sep Air Canada
16 Sep - 23 Sep Air Canada

Also check the deals for one-way flights from Washington to Barcelona in September.

Skyscanner

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 Barcelona

Cheap car rent in Barcelona