Snippet to convert city as Drop Down in WooCommerce Checkout. Note - Use only if you ship within that country

functions.php

/**
 * Snippet to convert city as Drop Down in WooCommerce Checkout
 * Created at : 28 Dec 2018
 * Updated at : 28 Dec 2018
 * PluginHive Plugins : https://www.pluginhive.com/plugins/
 * Gist Link : https://gist.github.com/varun-pluginhive/77383993417e6db5a71292a9548b1542
 */

add_filter( 'woocommerce_checkout_fields', function( $fields ) {
	$city_args = wp_parse_args( array(
		'type' => 'select',
		'options' => array(
			null			=> "Select",
			"Abu Dhabi"		=>	"Abu Dhabi",
			"Dubai"			=>	"Dubai"
		),
		'input_class' => array(
			'wc-enhanced-select',
		)
	), $fields['shipping']['shipping_city'] );

	$fields['shipping']['shipping_city'] = $city_args;
	$fields['billing']['billing_city'] = $city_args; // Also change for billing field
	return $fields;
} );