Yes and no. The website only shows fare information for past itineraries.

Did you not get the emailed receipt? You have to provide an email address at the time of booking, at least that's what I encounter when booking through southwest.com

But while you can't view the receipt on-line, you can use the 'travel tools' section and go to 'view/email air reservation'. Once the reservation is retrieved you have the option of resending the receipt - but only to the original email address used when booking.

If all else fails, you can call up WN and they can email you a copy of the receipt.