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Part of Southwest Airlines website unavailable

Brian Kushner | Flickr Vision | Getty Images

Portions of Southwest Airlines' website are currently unavailable, the company confirmed on its website and social media.

"Our sale is causing high demand right now so you may experience difficulty on We're working to fix the issue so please try back again soon!" it wrote on its website.

The company posted its first tweet citing technical problems earlier on Wednesday and began monitoring the situation closely around 1 p.m. ET.

Read MoreSouthwest fares drop below $100 round trip in 72-hour sale

Brandy King, communications director at the airline, told CNBC in an email unexpected activity due to an ongoing sale is partly to blame.

"In anticipation of high Customer demand, we added capacity to before launching our current WOW sale," she wrote. "The response from Customers exceeded expectations, and our Teams are quickly working to correct any impact to website functionality. We apologize for any inconvenience and have an intent focus on getting running at full speed as soon as possible. If a Customer is unable to manage their travel online, we encourage them to call 1-800-I-FLY-SWA for assistance."