Frontier Airlines said today it is bringing back nonstop summer flights to and from 37 markets and has begun new nonstop service in seven markets.

The Denver-based airline also is offering discounted fares through its website today only. (See below for details.)

Frontier said it already has restored nonstop summer service between Denver and 12 destinations and will add two more in coming days.

The 12 nonstop summer destinations from DIA already added are:

Bismarck, North Dakota Cleveland Cedar…