If you want a cheap flight from Manchester to Houston, you've got zero airlines to choose from.
Houston William P Hobby Airport is just one of the airports in Houston. If you're not set on a specific airport, try changing your search from Houston William P Hobby Airport to Houston to see a broader range of flights – they might be cheaper.
The cheapest month of the year to fly to Houston is September.
Flights from Manchester to are usually most expensive during November. If you're planning on going to Houston during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.