Do you have flights to Europe other than Ireland? Do you have flights to California?

Yes

Check with the airline carriers from Stewart different airline have some different trips. I have only flown Jet Blue and Allegiant airlines. American Airlines and Delta also fly out of Stewart. Hope thus helps 😉

You can fly to bergen, norway and belfast, northern ireland. There are no direct flights to california but you can connect through philadelpia on American airlines or detriot on delta.