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