Google Flights not working correctly

The site opens. It allows me to put in one airport. When I try to put in the second airport, it's as if it doesn't recognize that I entered it, even though sometimes the field is filled with what I typed and selected from the drop-down menu.

It works on my laptop, but not on my Android phone. I've tried deleting browsing cookies. I've tried using a different browser (Firefox instead of Chrome). I've tried turning on/off the phone... Nothing helps.

I've used this site with no problem for years, and this just started over the past 2 days.