from web site
In San Francisco, they invest the night at a bed and breakfast run by Rusty's parents Clark and Ellen. They mean to fly house the next day, however Rusty and Debbie confront each other about their stagnant marital relationship and decide to begin over again. With some encouragement from Clark the next morning, Rusty obtains his daddy's Wagon Queen Household Truckster and drives Debbie and the boys to Walley World to ride their latest roller rollercoaster, the Velociraptor.
A fight breaks out, which the Griswolds win, forcing the other family to leave. The Griswolds lastly board the flight, however it stalls midway up a loop, and they are saved after a number of hours. Rusty utilizes his airline company connections to schedule a trip in Paris alone with Debbie, while sending out the boys house where their next-door neighbors will care for them.
Exasperated, Debbie learns that it will be a 12-hour flight. Ed Helms as Rusty Griswold, a pilot for Econo-Air. residing in Suburban Chicago Christina Applegate as Debbie Fletcher Griswold, Rusty's better half. Emily Kincaid as young Debbie Fletcher Skyler Gisondo as James Griswold, Rusty and Debbie's older boy. Cameron McIntyre as young James Griswold Steele Stebbins as Kevin Griswold, Rusty and Debbie's younger boy.
Leslie Mann as Audrey Griswold-Crandall, Rusty's sis. Chevy Chase as Clark Griswold, Rusty and Audrey's dad who now owns a bed and breakfast in San Francisco. Key Reference as Ellen Griswold, Rusty and Audrey's mother who now owns a bed and breakfast in San Francisco. Charlie Day as Chad, a suicidal river rafting guide who was recently discarded by his sweetheart.
Ron Livingston as Ethan, an airline pilot and Rusty's rival. Norman Reedus as Trucker, an unnamed truck motorist who stalks the Griswold family. Keegan-Michael Key as Jack Peterson, a buddy of the Griswold family. Regina Hall as Nancy Peterson, the wife of Jack and pal of the Griswold family. Elizabeth Gillies as Heather, a member of the Tri Pi sorority that is a fan of Debbie.