Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Ottawa to Greensboro as you normally would.
Related info for your journey
Useful info, stats and facts about Ottawa to Greensboro flights.
These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Ottawa Airport to Greensboro/H. Point Airport flight would often be abbreviated as a YOW to GSO flight.