Is Sun Country Airlines Holdings, Inc. overvalued or undervalued?

As of 11 August 2025, the valuation grade for Sun Country Airlines Holdings, Inc. has moved from fair to expensive, indicating that the stock is overvalued. The company currently has a P/E ratio of 12, an EV to EBITDA ratio of 3.88, and a Price to Book Value of 1.04, which are relatively high compared to its peers. For instance, Air Transport Services Group, Inc. has a significantly higher P/E ratio of 54.21, while Spirit Airlines, Inc. shows a negative P/E, reflecting its risky status.
In terms of performance, Sun Country Airlines has underperformed the S&P 500 in several time frames, with a year-to-date return of -9.47% compared to the S&P 500's 12.22%. This, along with the high valuation ratios, reinforces the conclusion that the stock is overvalued.