This are my top websites and apps  in order to book flights. I rely in the trustworthy and easy used that they are. Most of the web page have apps and they are good too.

Web pages:

1. Google Flights

2. kayak

3.Orbitz

4. Expedia

Apps:

1.skyscanner

2.Expedia

3. KAYAK

4. Orbitz

5. eSky