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.Flight deals to Las Vegas seem to pop up quite often — especially for East Coast travelers — and today American and United are offering cheap flights for Sin City-bound flyers, for travel dates later this fall. The cheapest flights aren’t available from all cities, but there are quite a few with some low prices.Some of the discounted rates we found include Washington (DCA) to Las Vegas (LAS) from $186, and Philadelphia (PHL) to Las Vegas (LAS) from $199. Earlier today, there were also quite a few deals to Boston, though most of those are no longer available. Still, you might be able to find lower-priced flights on very select dates.Airline(s): American and UnitedRoute(s): DCA and PHL to LASCost: $186-$200+ round-trip in economyDates: Fall 2015Elite Mileage Earning: At least 2,160 elite-qualifying milesFare Class: O or NBooking Link: OrbitzPay With: American Express Premier Rewards Gold, Citi Prestige or Chase Sapphire PreferredHere are a few examples of what you can book: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.Washington (DCA) to Las Vegas (LAS) for $186 on American (earns 4,177 EQMs):Washington (DCA) to Las Vegas (LAS) for $186 on American.Philadelphia (PHL) to Las Vegas (LAS) for $199 on United (earns 5,112 PQMs):Philadelphia (PHL) to Las Vegas (LAS) for $199 on United.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!