Response from Capital One Online Chat, “There is no limit. You can request a credit line increase online by choosing the “Request Credit Line Increase” link from the Services tab. When you submit your request, we’ll review your information. ”
Q: What information do I need to give it customer rep?
A: Full name on appear in credit card, zip code, date of birth and last four digits of your Social Security Number and last four digit of credit card.
Q: How much credit increase I can receive per request? and How often I can request?
A: $2000 per request. You can request after 6 months of prior credit line increase request.