be kind (anyone )to let me know what the ticket fees is from lagos to us
I am assuming Tulsa, Oklahoma. It's not a major airport at all. So, you will fly into any of the major airports and then connect to Tulsa. Personally, I would suggest you book all parts of the flight with the same airline if possible. Rather than book them separately. So, that if something goes wrong, a delay or whatever, and you miss your connecting flight, the airline will be responsible for getting you to your final destination.
use GOOGLE.COM to type "flight travel+Oklahoma" exactly without an quotation. You will find 399,000 narrowed search result looking for flight booking reservation.
You can use your debit card to pay for flight booking reservation online and print it out for your VISA interviewer as your credible source document.
You also need to check out sites of Delta airline/North American Airline/Lufthansa yourself comparing those flight ticket prices varied which one is the most affordable price for you in order to book your flight online.