Upvote:1
Call Frontier Airlines at 801 401 9000.
Wait for someone to answer. Tell them your name and they will ask Airport/Date/Time.
They will ask you for your email and they may ask for last 4 digits of your credit card. You will get an email with your confirmation number.
Upvote:7
Check your credit card statement to find the website you used to book it and then contact them.
Upvote:15
Call the airline. They should be able to find your reservation by your name and travel dates.