"Taking off! Goodnight Twitterville! Tweet dreams!" she posted on Twitter at 3:18 a.m. on Saturday.
A few hours later, a tired Kardashian wrote that she had a three-hour layover and posted a picture of her snoozing in a cot in the airport. "The most comfy thing ever!!!!" she Tweeted to tennis star Serena Williams.
"They took a few months off and couldn't be apart," a source says of the couple, who split in July after about two years of dating. "The time away was needed so that they could figure out what their priorities were."