How to book cheap flights

1. Expedia: Expedia is a comprehensive travel website that allows you to compare prices and book flights, hotels, and rental cars. 
2. Orbitz: Orbitz is a popular travel website that provides a wide range of travel options, including flights, hotels, and rental cars.
3. Travelocity: Travelocity is a travel website that provides a range of travel options, including flights, hotels, and rental cars.
4. CheapOair: CheapOair is a website that specializes in providing affordable travel options, including flights, hotels, and rental cars.
5. Kayak: Kayak is a popular travel website that allows you to compare prices and book flights, hotels, and rental cars.
6. Priceline: Priceline is a travel website that offers a range of travel options, including flights, hotels, and rental cars.
7. Google Flights: Google Flights is a flight search engine that allows you to compare prices and book flights from multiple airlines.

These are just a few of the many websites for booking flights. When using these platforms, be sure to compare prices, read reviews, and check the terms and conditions before making a booking. It is also advisable to book in advance to get the best deals.