Update: Some offers mentioned below are no longer available. View the current offers here.JetBlue is known for offering terrific flash sales and great in-flight service. Right now, the carrier is offering an incredible flash sale ending at midnight tonight with fares starting at just $29 one-way. There are a ton of routes available including transcontinental flights like New York (JFK) to Burbank, California (BUR) and Caribbean routes like New York (JFK) to Aguadilla, Puerto Rico (BQN). Other notable routes include Boston (BOS) to Aruba (AUA), Los Angeles (LAX) to Buffalo (BUF) and plenty of flights from the Northeast to Florida.The flights are only available for Saturday, September 3 and Sunday, September 4, so you may only be able to score a heavily discounted flight one-way. These deals also make for amazing points redemptions, with flights from just 900 miles one-way — translating to over 3.7 cents per mile in value! Remember that you can also get 10% of your points back with each redemption if you have the JetBlue Plus Card, which makes this promo even more valuable.JetBlue has a massive flash sale.To take advantage of this fare sale, you must book by 11:59pm ET on August 17 (tonight). Here are some samples of routes with discounted fares:Sample fares.Airline: JetBlueCost: $29+ one-wayDates: September 3-4Booking Link: JetBlue.comPay With: American Express Premier Rewards Gold, Citi Prestige or Chase Sapphire PreferredHere are some examples of what you can book:New York (JFK) to Burbank (BUR) for $29 or 1,200 points one-way in September:New York (JFK) to Burbank (BUR) for $29.New York (JFK) to Burbank (BUR) for 1,200 points and $6.Boston (BOS) to San Juan (SJU) for $39 or 900 points one-way 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.Boston (BOS) to San Juan (SJU) for $39.Boston (BOS) to San Juan (SJU) for 900 points and $6.Buffalo (BUF) to Los Angles (LAX) for $29 or 1,200 points one-way in September:Buffalo (BUF) to Los Angles (LAX) for $29.Buffalo (BUF) to Los Angles (LAX) for 1,200 points and $6.New York (JFK) to Reno (RNO) for $29 or 1,200 points one-way in September:New York (JFK) to Reno (RNO) for $29.New York (JFK) to Reno (RNO) for 1,200 points and $6.New York (JFK) to Aguadilla (BQN) for 900 points or $39 one-way in September:New York (JFK) to Aguadilla (BQN) for $39.New York (JFK) to Aguadilla (BQN) for 900 points and $6.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.