Springton Middle School in Media shared the reunion on Twitter.
The post said a flight attendant at Spirit Airlines recently found the book and mailed it back.
In a letter, the flight attendant said the book traveled thousands of miles across the country before it was found.
They hoped by returning the book the student wouldn't be charged a fine.
Spirit responded to the school's post with a tweet of their own, "At Spirit, we always #InvestInTheGuest. Think of all the stories this book can tell after its long journey home! We're happy we could return it to its rightful owner."