You can book direct or from Priceline where tickets purchased today are refundable until 11:29pm tomorrow. Please see this post for directions on how to cancel these tickets.
10/31 is a Saturday, but there are plenty of 8pm-11:59pm options.
-Boston to Orlando at 8:04pm
-Boston to San Francisco at 8:15pm
-JFK to Las Vegas at 8:15pm
-Boston to Tampa at 8:35pm
-JFK to Denver at 8:36pm
-JFK to West Palm Beach at 8:40pm
-White Plains/HPN to Orlando at 8:40pm
-Washington/DCA to Fort Lauderdale at 8:50pm
-LGA to Fort Lauderdale at 9:32pm
-JFK to Los Angeles at 9:45pm
-JFK to Fort Lauderdale at 9:50pm
-Fort Lauderdale to San Juan, Puerto Rico at 10:35pm
-Orlando to San Juan, Puerto Rico at 11:55pm
-JFK to San Juan, Puerto Rico at 11:59pm
-JFK to Aguadilla, Puerto Rico at 11:59pm
-JFK to Ponce, Puerto Rico at 11:59pm
-Fort Lauderdale to Washington/DCA at 8:20pm
-San Juan, Puerto Rico to JFK at 8:35pm
-Orlando to Boston at 8:35pm
-Orlando to White Plains/HPN at 8:44pm
-San Juan, Puerto Rico to Fort Lauderdale at 8:50pm.
-San Francisco to JFK at 9:00pm
-San Diego to JFK at 9:05pm
-Fort Lauderdale to JFK at 9:10pm
-Portland to JFK at 9:10pm
-San Francisco to Boston at 9:19pm
-Orlando to JFK at 9:32pm
-Burbank to JFK at 9:42pm
-Orlando to Newark at 9:45pm
-Las Vegas to JFK at 9:55pm or 11:59pm.
-Seattle to JFK at 10:05pm
-Oakland to JFK at 10:25pm
-San Francisco to Fort Lauderdale at 10:45pm
-Salt Lake City to JFK at 10:51pm
-Seattle to Boston at 11:15pm
-Las Vegas to Boston at 11:55pm
-Reno to JFK at 11:59pm
-Denver to JFK at 11:59pm
-Los Angeles to Boston at 11:59pm
You can always grab a $30.99 flight one-way and return with miles or vice versa.
Post what else you find and check back for more late night sample fares.
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