LAX to Las Vegas is one of the shortest and most competitive routes in the West, which is exactly why it is easy to overpay. Weekend round trips can swing by $80 or more depending on timing, so a little flexibility goes a long way.
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Quick weekend round trip to the Strip for under $90.
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Mid-week departures are reliably cheaper than Friday-out, Sunday-back weekend patterns. If your dates are firm, booking two to six weeks ahead usually lands a fair price; if they are flexible, watch for the dips that show up on off-peak days.
Burbank (BUR) and Ontario (ONT) also serve Las Vegas and can beat LAX on fees and drive time. On such a short hop, the airport you choose can matter as much as the fare.
Many of the lowest LAX–LAS fares are basic fares with carry-on restrictions. If you are bringing a bag, add it at booking rather than at the gate.
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Round trips under $100 appear regularly on off-peak days, and weekend patterns tend to run higher. A sub-$90 weekend round trip is at the low end of the typical range.
Driving is about four hours and can be cheaper for a group, but flying wins on time and on solo or weekend trips when fares dip low. Compare the all-in cost including parking and bags.