The union tentatively agreed to the deal at 11 pm the night before, with an official ratification vote to follow.
While the exact terms of the settlement have not been revealed to the press, the union was seeking large raises to keep pace with the rising cost of living.
Labour leaders and activists have spoken of the deal in positive terms.
No agreement has been reached with the Hard Rock Casino, the last of the five casinos in the city agree to a settlement – with a Sunday strike deadline in place.
Unite Here estimated that the casinos could risk losing $1m (£813,153/€943,067) per day in earnings if the planned strikes went ahead.