Spirit & Frontier

Spirit

Welcome Bonus: 40K points +$100 companion voucher after $1000 in purchases in 3 months

Key Benefits: 25% rebate on inflight purchases, Zone 2 boarding, $100 companion voucher after $5000 in purchases

Multipliers: 3X points on Spirit, 2X points on grocery stores and dining

Annual Fee: $79, waived in first year

Frontier

Welcome Bonus: 50K Miles after $500 in purchases in 3 months

Key Benefits: Zone 2 Boarding, $100 voucher after $2500 in spend

Multipliers: 5X miles on Frontier, 3X miles at restaurants 

Annual Fee: $89, waived in first year

Connor's Recommendation

Spirit credit card is useful if you are going for spirit gold status, or gold status match

Frontier credit card not useful as the miles redemption value appears to be very low

** Spirit and Frontier are merging, TBD on future loyalty and credit card programs **