Cheap flights from Seattle to Barcelona from $177

The cheapest month to fly to Barcelona-El Prat Airport from Seattle is in January. Flight prices, which tend to average around $478, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of January, then book flights to Barcelona-El Prat Airport from Seattle during February instead. Flights to Barcelona-El Prat Airport in February, while not as cheap as those in January, still average around $486.

The cheapest day to depart on your flight to Barcelona-El Prat Airport is on a Friday when prices can be found for as low as $920. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Thursday because tickets tend to average around $1,235. These prices are subject to change though, so be sure to set up a Price Alert for flights to Barcelona-El Prat Airport.

Fly from Seattle/Tacoma Intl to Barcelona-El Prat for the best Seattle/Tacoma Intl - Barcelona-El Prat flight prices

You are more likely to see cheaper flights to Barcelona-El Prat Airport from Seattle when booking weeks ahead of your departure date. In general, you can expect to find flights to Barcelona-El Prat Airport for around $775 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Barcelona-El Prat Airport from Seattle for as low as $723 on momondo.

There are 2 cabin classes available to choose from on Seattle to Barcelona-El Prat Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 20% on your flight if you consider stops on a Seattle to Barcelona-El Prat Airport flight.

Icelandair, British Airways, and Delta are the most popular carriers operating from Seattle/Tacoma Intl to Barcelona-El Prat

Condor, Icelandair and Delta are the top three most popular airlines that fly to Barcelona-El Prat Airport from Seattle according to our data. Condor is the first choice among our users, with 37% of people opting to fly with this airline when traveling to Barcelona-El Prat Airport. Keep in mind that there are 14 different airlines that fly to Barcelona-El Prat Airport on a routine basis, so you have a few additional options to choose from.

Historically, on average around 25% of flights between Seattle and Barcelona have experienced a delay on any given week. The average delay length over the past 12 months has been 153 minutes.

Generally, flights departing in the early afternoon tend to experience fewer delays. Flights in the early afternoon have, in the past, seen delays more frequently in comparison.

Frankfurt am Main (FRA) was the most common stop: 32% of momondo users choosing 1-stop flights on this route connected there.

Flights via Reykjavik (KEF) offer the lowest average round-trip price of $522.

Flights connecting via Paris (CDG) have the shortest average one-way travel time: 12h 30m.

Chicago (ORD) has the shortest average layover time for this route: 1h 28m.

1 flights are operational daily from Seattle to Barcelona-El Prat Airport as of June 2026. The most popular departure time for this route is 3:00PM, with 100% of flights per day taking off in the afternoon.

As of June 2026, 9 flights take off from Seattle and land in Barcelona-El Prat Airport each week. The most common flight departure day for this route is Tue, with 33% of weekly flights taking off on this day.