Update: Some offers mentioned below are no longer available. View the current offers here.Want to see the latest flight deals as soon as they’re published? Follow The Points Guy on Facebook and Twitter, and subscribe to text message alerts from our deals feed, @tpg_alerts.Airfare deals are typically only available on limited dates. We recommend you use Google Flights to find dates to fly, then book through an online travel agency such as Orbitzor Expedia, which allows you to cancel flights without penalty by 11pm Eastern Time within one day of booking. However, if you’re using The Platinum Card® from American Express, you’ll need to book directly with the airline or through the Amex Travel portal to get 5x MR points. Remember: Fares may disappear quickly, so book right away and take advantage of Orbitz or Expedia’s courtesy cancellation if you’re unable to get the time away from work or family.We’re seeing flights, including nonstop options on full-service carriers, from all over the US to Spain with prices starting at just $318 round-trip. You can fly from New York (JFK), San Francisco (SFO), Los Angeles (LAX), Miami (MIA), Fort Lauderdale (FLL) and Philadelphia (PHL) to either Barcelona (BCN) or Madrid (MAD) on Delta, American or Iberia, depending on the route. American and Delta flights are in basic economy, so you’ll have to pay extra to select a seat or check a bag. However, an airline’s cobranded credit card can help defeat some of basic economy’s worst aspects.If you’re looking to do some exploring, check out Get Your Guide for a list of the best activities in Barcelona.To search, head to Google Flights and enter your origin and destination cities. Scroll through the calendar function to find dates and prices that work for you. Google may display a higher price, but after clicking on your preferred flights and waiting a few seconds, you should see the dirt-cheap fares. Finally, click through to book directly with the airline or through an OTA such as Priceline or Expedia.Airlines: Delta, Iberia, AmericanRoutes: JFK/SFO/LAX/MIA/FLL/PHL to BCN/MADCost: $318+ round-trip in economyTravel Dates: September – April 2019Pay With: The Platinum Card® from American Express (5x on airfare booked directly with the airline), Citi Premier® Card, Chase Sapphire Reserve, or Chase Sapphire Preferred Card (2x on travel)Booking Link: Priceline, Orbitz, Expedia or directly with the airlineHere are a few examples of what you can book:New York (JFK) to Barcelona (BCN) for $318 round-trip nonstop on Delta:Sign up for our daily newsletterEmail addressSign upI would like to subscribe to The Points Guy newsletters and special email promotions. The Points Guy will not share or sell your email. See privacy policy.Miami (MIA) to Madrid (MAD) for $358 round-trip on Delta:Fort Lauderdale (FLL) to Madrid (MAD) for $358 round-trip on Delta:Los Angeles (LAX) to Madrid (MAD) for $383 round-trip nonstop on Iberia:Philadelphia (PHL) to Madrid (MAD) for $429 round-trip on Delta:San Francisco (SFO) to Barcelona (BCN) for $438 round-trip on American:Maximize Your PurchaseDon’t forget to use a credit card that earns additional points on airfare purchases, such as The Platinum Card® from American Express (5x on flights booked directly with airlines or American Express Travel), Chase Sapphire Reserve, Citi Premier, or the Chase Sapphire Preferred Card (2x on all travel purchases). Check out this post for more on maximizing airfare purchases.H/T: Secret Flying