Update: Some offers mentioned below are no longer available – View the current offers hereWant 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 that 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.Recently, many airlines have been offering incredible fares from the major markets to Europe, but we haven’t seen many deals from smaller markets around the nation. However, Delta is offering a huge sale on flights from tons of cities across the US to European cities including Barcelona (BCN), London (LHR) and Madrid (MAD) from just $400 round-trip. There are some flights available in early May, but the majority of availability begins in September and goes through mid-December. Note that because many of these flights originate in smaller cities, you’ll have to connect in one of Delta’s hubs such as Atlanta (ATL), Detroit (DTW) or Minneapolis (MSP) before crossing the pond. Since so many cities are involved, be sure to check Google Flights to see if you can score a ticket from your hometown and don’t hesitate to book!Airline: DeltaRoute: US cities to EuropeCost: $400 round-trip in economyDates: May 2017; September 2017 - December 2017Booking Link: OrbitzPay With: The Platinum Card from American Express (5x on airfare), Chase Sapphire Reserve, Citi Prestige (3x on airfare) or Chase Sapphire Preferred (2x on travel)Here are a few examples of what you can book:Oklahoma City (OKC) to Barcelona (BCN) for $400 round-trip in October:St. Louis (STL) to Barcelona (BCN) for $400 round-trip in October:Jacksonville (JAX) to Madrid (MAD) for $405 round-trip in September: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.Portland (PDX) to Madrid (MAD) for $405 round-trip in October:Sacramento (SMF) to London (LHR) for $501 round-trip in October:Grand Rapids (GRR) to London (LHR) for $501 round-trip in May:Des Moines (DSM) to London (LHR) for $501 round-trip in September:Maximize Your PurchaseDon’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.If you’re able to score one of these tickets, please share the good news in the comments below!