functions.php

function wc_edit_bookings_form_fields_order( $fields ) {
    $duration = $fields['wc_bookings_field_duration'];
    $persons  = $fields['wc_bookings_field_persons'];
    $resource = $fields['wc_bookings_field_resource'];
    $date     = $fields['wc_bookings_field_start_date'];

    $new_fields = array(
        'wc_bookings_field_start_date' => $date,
        'wc_bookings_field_resource'   => $resource,
        'wc_bookings_field_duration'   => $duration,
        'wc_bookings_field_persons'    => $persons
    );

    return $new_fields;
}
add_filter( 'booking_form_fields', 'wc_edit_bookings_form_fields_order' );

What about person types? they have variation ID at the end - but no longer showing when using this code.

https://gist.github.com/MindyPostoff/c70dc98a099a9bf1c2f0#gistcomment-1406818