Task: As I had planned to visit London for a couple of days, I searched for one-way flights to London airport on October 30 for two adults in the Expedia app.
Steps:
Open the Expedia app
Click on the flights option
Click on the one way option
Click on the flying from section
Click on the second result option
Type London in the flying to 
Click on the first result option
Click on the 30th date of October.
Click on the done button.
Click on the traveler section.
Click on the plus icon of the adults section
Click on the done button.
Click on the search button.