The IRS standard mileage rate as of January 1, 2022 is 58.5¢ per mile driven for business, so your
approximate mileage reimbursement for this trip would be
$3.51 (this is for a one-way trip,
double it if you're calculating round trip).
This depends on the flight distance from Incheon to Bucheon which is 9 miles. Most airlines have frequent flyer
programs and they usually measure by flight distance, so the flight
time is just for your reference if you're planning a trip.