The best replacement for frontier airlines is southwest.

The best alternatives to frontier airlines are rated as following:
★★★★★  southwest
★  airtran
★  midwest airlines
★  us airways

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Speaking about frontier airlines, one probably shouldn't forget about baggage fees.

Other search terms related to frontier airlines and their ratings are:
★★★★★ baggage fees
★★★ baggage charges
★★★ bag fees
You have in mind a companion for frontier airlines and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of frontier airlines in all years. Click on graph for more.
frontier airlines
southwest
airtran