Order by meta value (numeric value lower to higher)

I think that what you’re looking for is this: 

<?php
$tours = new WP_Query(array(
                'post_type'     => 'tour',
                'posts_per_page'=> 12,
                'meta_key' => 'tour_price',
                'orderby' => 'meta_value_num',
                'order' => 'ASC'
            ));

Descending means going down, as in, high to low.
Ascending is going up, low to high.

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