recurse.js

recursive = (el) => el.children && el.children.length !== 0 ? Array.from(el.children).reduce((prev, child) => [...prev, ...recursive(child)], Array.from(el.children)) : [el];

$$('.js-hotel-result').forEach(hotelEl => {
const isBad = recursive(hotelEl).reduce((prev, el) => prev || !!(/^ ?[2-9][0-9](?:\.[0-9]+)? miles.*/).exec(el.innerText), false);
if (isBad) {
    hotelEl.parentNode.removeChild(hotelEl);
}
});

A more readible version of this would be:

function recursive(el) {
	if (el.children && el.children.length !== 0) {
		
		const elChildren = Array.from(el.children);
		let allElements = [...elChildren];

		for (let child of elChildren) {
			const childChildren = recursive(child);
			allElements = allElements.concat(childChildren)
		}

		return allElements;
	} else {
		return [el];
 	}
}