I'd UberXL (a regular Uber won't fit ur fam + luggage, XL means something like a suburban would pick you up). You can usually find a $20 off coupon for your first ride. (Through 12/31/16 ChaseUber will get you $30 off your first Uber when paying with the Chase card you use to set up your Uber account.) One adult can use their account for the trip from LAX, the other can set up their own account so you can double dip on whatever first time coupon you use for the trip back. Idk if it's cheapest, you can get price estimates on the Uber website. Our regular Uber was <$45 each trip. With $30 off it was <$15 each trip. We got serious bang for our buck! FYI Uber pricing is dynamic, if it's a busy time of day prices go up. (We traveled between 11am and 1pm so no surge pricing.)