Kevin Costner's Estranged Wife Christine Leaves Town With Kids Amid Divorce Drama

Kevin Costner's estranged wife is getting out of Dodge amid a swirl of allegations and counter-allegations in her bitter divorce ... and she's taking 2 of their kids with her.

Christine Baumgartner flew out of LAX Thursday, getting dropped off at the airport by a car service and walking into the terminal with a cup of coffee and some luggage.

It looks like the July 4th holiday weekend is coming at the right time for Christine ... the past two months have been rife with divorce drama, and now she's fighting Kevin over money and a place to live, among other things.

This has gotta be a quick trip ... she's got to be back in Santa Barbara Wednesday for a big court hearing, where Christine will contest the prenup.

TMZ broke the story ... Christine wants $248,000 a month in child support, but Kevin's accountant says those expenses include more than $100k for her own plastic surgery, in addition to boutique shopping, ATM withdrawals and more.