If you want to change the default country displayed on the booking form then you can do so using the child theme.

To know how to create and activate the child theme please refer to below given link:

Child Theme

After activating the child theme in your child theme functions.php add below given code:

 

function wp_travel_customize_booking_form($fields) {

   $fields['country']['default'] = 'BR';

   return $fields;

}

add_filter( 'wp_travel_booking_form_fields', 'wp_travel_customize_booking_form', 99 );

Her change the “BR” code with your country code.

Note: The above-provided code does not work for the recent versions. So if the code did not work for you then please add below given code in your child theme’s functions.php file.

function wp_travel_customize_booking_form($fields) {

   $fields['traveller_fields']['country']['default'] = 'NL';
   $fields['billing_fields']['country']['default'] = 'NL';

   return $fields;
}

add_filter( 'wp_travel_checkout_fields', 'wp_travel_customize_booking_form', 99 );