I found my answer in another forum…
This works:
$args = array (
'post_type' => 'tour',
'meta_query'=> array(
array(
'key' => 'trav_tour_city',
'compare' => 'LIKE',
'value' => $term->term_id,
)
),
'meta_key' => 'trav_tour_city',
);