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 Orbitz or Expedia, which allows you to cancel flights without penalty by 11pm Eastern Time within one day of booking. However, if you’re using the American Express Platinum Card, you’ll need to book directly with the airline or through 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.Several airlines are offering discounted round-trip tickets to Madrid (MAD) and Barcelona (BCN) for travel from late summer through fall 2018. The cheapest price we’re seeing is just $358 round-trip between New York (JFK) and MAD on SkyTeam partner Air Europa. Note, though that the cheapest tickets in this sale will be booked into basic economy, which means you’ll have to pay extra for checked bags, food and other amenities. Regular economy tickets are available as well for a little bit more money — though this could be worth it if you plan on checking a bag on your trip. Search for your itinerary on Google Flights and then complete booking directly with the airlines themselves.Airline: Iberia, Air Europa, KLMRoutes: JFK/BOS to MAD/BCNCost: $358+ roundtrip in economyDates: September-November 2018Booking Link: Orbitz, Expedia or directly with the airlinePay With: The Platinum Card from American Express (5x on airfare), Chase Sapphire Reserve, Citi Prestige (5x on airfare plus excellent trip delay insurance) or Chase Sapphire Preferred Card (2x on travel)New York (JFK) to Madrid (MAD) for $358 round-trip in October on Air Europa in basic economy:Boston (BOS) to Barcelona (BCN) for $361 round-trip in October on LEVEL (each leg booked separately):Newark (EWR) to Madrid (MAD) for $452 in October on Delta/KLM in regular economy:Maximize Your PurchaseSign 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.Don’t forget to use a credit card that earns additional points on airfare purchases, such as the American Express Platinum Card (5x on flights booked directly with airlines or American Express Travel), Chase Sapphire Reserve, or Citi Prestige (5x on airfare) or the Chase Sapphire Preferred Card (2x on all travel purchases). Check out this post for more on maximizing airfare purchases.