Assuming you have worked continuously since April 1 and have had paychecks sufficient to cover these payments, you final payment should be reflected on your August 16, 2018 pay advice.
Flight Attendant with insufficient pay checks during the five (5) month repayment process period may owe a residual amount that will carry-over into the next pay period. Keep in mind, in order to avoid having this loan become a taxable event, any remaining amounts due must be paid by December 2018.
For additional information on the bridge loan repayment process see the One United publication.