Frontier Airlines is raising its bag fees in economy class, to $20 for the first checked-bag and $30 for the second checked-bag.

Please note: Frontier has three classes of service – economy (cheapest), classic (mid-range) and classic plus (most expensive) — and there is NO charge for a first or second checked-back for either classic class.

Bottom line: On some Frontier flights, if you plan to check even one bag – it might be more economical for you to fly “classic” – you with me? The bag fee might make your economy ticket more expensive than the classic ticket.

Frontier is also lowering some fees, too including the “change fee” for economy tickets – it drops from $150 to $100.

See all the details on Frontier’s site – or check the FareCompare Domestic Fee Chart (we’ve already updated it).