Update: Some offers mentioned below are no longer available. View the current offers here.If your travel plans are flexible this October 31, today’s deal is tough to beat. JetBlue is offering a $31 price tag for many domestic flights — including transcons — on Halloween. This is the only travel date JetBlue is offering at this price point, so unless you plan on flying back the same day, you’ll have to spring for a normal-priced ticket on one of your flights.There are a ton of different flight routes available with a huge range of city and airport options. Availability also seems to be quite high, even on the most popular routes. Flights must be booked by 11:59 pm tonight (October 1).Airline: JetBlueRoutes: Many JetBlue routesCost: $31 each way in economyDates: Saturday, October 31, 2015Pay With: American Express Premier Rewards Gold, Citi Prestige or Chase Sapphire PreferredHere are a few examples of what you can book:New York (JFK) to Los Angeles (LAX) for $31 on October 31: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.New York (JFK) to Los Angeles (LAX) for $31 on October 31.Boston (BOS) to Las Vegas (LAS) for $31 on October 31:Boston (BOS) to Las Vegas (LAS) for $31 on October 31.San Francisco (SFO) to New York (JFK) for $31 on October 31:San Francisco (SFO) to New York (JFK) for $31 on October 31.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.If you’re able to score one of these tickets, please share the good news in the comments below!