The 27th is a Tuesday. Monday the 26th is Memorial Day. Do you mean Tuesday?
Traffic on Tuesday should be about what it normally would be, which means excessively heavy at most times of the day in the LA area. Time your departure carefully.
Monday OR Tuesday after Memorial Day, I would think you are right, that most of the traffic will be going in the other direction (leaving Las Vegas). But I-15 is and can be unpredictable at times! Good Luck & enjoy your drive.
On monday there will be a lot of traffic into LA but don't think you'll have problems going out either on monday or tuesday.
It's all good so! Thanks
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