The Up hitmakers are currently trying to crack America, and the band was scheduled to jet from London to Atlanta, Georgia to continue promotional work.
Singer Mollie King came close to missing her flight after her car got caught in traffic, but she managed to check in at the last minute.
Taking to Twitter.com, she writes, "And she's Through!!! Boom!!! Nothing like cutting it fine to get the adrenaline going!!"
However, her bandmate Humes was less lucky, and told fans on the social networking site, "I missed a flight for the first time in my life!!! And it wasn't my fault! Fumminnggg (sic). It's okay though I will try tomorrow. stress."
Fellow The Saturdays star Una Healy added, "Don't stress, you will get here in time tomorrow don't worry, I felt so bad or (sic) you they should have let you on!!"