Angelina Jolie and her son Maddox flew from Los Angeles to London on Friday night ... guess she didn't end up having a romantic Valentine's Day with fiance Brad Pitt!

Angelina recently wrapped filming on Unbroken in Australia, and Brad (and the couple's six kids) were pretty much there the entire time, so it's not like Brangelina have been apart over the last few months. In fact, the duo enjoyed several days of alone time at an exclusive resort in Airlie Beach before they jetted back to the states earlier this month ... looks like everything is just fine between them!

But when will they make it down the aisle?