I have been flying Frontier almost exclusively since May (10 flights so far), and I have had my share of delayed flights, mostly due to weather when every other airline was also experiencing problems. Frequency is pretty low on a lot of routes so if a flight is cancelled you may need to lay over for another day (or more) or make alternate arrangements.

They seem to frequently have very low last minute fares.

If you can travel with a backpack that will fit under the seat it can be incredibly cheap. If you must have a lot of baggage, then other airlines are often cheaper.

Their in-flight product is fine, the cabin crews have been great. Their website is a little wonky but slowly getting better.

The phone customer service is hit and miss. Sometimes you get someone who is great and know their products and their systems, sometimes you get someone who can't really communicate and doesn't understand what your are saying (not the words, the concepts).

The one caveat is to understand what your are buying. There are potentially a lot of fees.

• Soft Drinks and Snacks cost money (and they don't take cash).
• Checked bags cost money.
• Carry-on bags cost more than checked bags.
• Seat selection costs money.
• They don't have a tool free number.

You do get a Free Personal Item (14x8x18) which must fit under the seat, although the overhead bins are often nearly empty and they don't object to you using them.

All fees are cheaper if you pay early and more expensive at the airport and even more expensive at the gate. Plan ahead.