Update: Some offers mentioned below are no longer available. View the current offers here.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, which allows you to cancel flights without penalty by 11pm Eastern Time within one day of booking. Remember: Fares may disappear quickly, so book right away and take advantage of Orbitz’s courtesy cancellation if you’re unable to travel. Additionally, keep in mind that discounted partner fares may not earn miles with US-based carriers.In case you missed the $400+ airfare deals to Europe this past month, Oneworld airlines are bringing back these low fares from several US cities to Europe. We are seeing fares as low as $438 round-trip from United hub cities like Newark (EWR), Houston (IAH) and Cleveland (CLE) to Zurich (ZRH) in Switzerland. You can also find similarly low fares from Delta hub cities such as Atlanta (ATL), Detroit (DTW) and Minneapolis (MSP) to several European gateways. The best part is that these fares are valid starting in September and good for most of the following year, including the Thanksgiving and Christmas holidays.Airline: Oneworld carriersRoute: United and Delta hubs to EuropeCost: $438+ round-trip in economyDates: September 2016 - May 2017Booking Link: OrbitzPay With: Premier Rewards Gold Card from American Express, Citi Prestige or Chase Sapphire PreferredHere are a few examples of what you can book:Newark (EWR) to Zurich (ZRH) for $438 round-trip on American in September:Newark (EWR) to Zurich (ZRH) for $438 round-trip on American.Cleveland (CLE) to Frankfurt (FRA) for $494 round-trip on American in October:Cleveland (CLE) to Frankfurt (FRA) for $494 round-trip on American.Houston (IAH) to Brussels (BRU) for $495 round-trip on British Airways in October:Houston (IAH) to Brussels (BRU) for $495 round-trip on British Airways.Chicago (ORD) to Amsterdam (AMS) for $506 round-trip on American Airlines in May: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.Chicago (ORD) to Amsterdam (AMS) for $506 round-trip on American.Atlanta (ATL) to Amsterdam (AMS) for $457 round-trip on American in October:Atlanta (ATL) to Amsterdam (AMS) for $457 round-trip on American.Maximize Your PurchaseDon’t forget to use a credit card that earns additional points on airfare purchases, such as the American Express Premier Rewards Gold or Citi Prestige (3x on airfare) or the Chase Sapphire Preferred Card (2x on all travel purchases). Check out this post for more on maximizing airfare purchases.H/T: The Flight DealIf you’re able to score one of these tickets, please share the good news in the comments below!