[04/21/2018 @ 2:27 PM CT] Fare gone. Removing from deal list.
Frontier has round-trip flights from Milwaukee (MKE) to Philadelphia (PHL) for $28, NONSTOP. $15 each-way. Flights in April and May on Sunday, Monday, and Tuesdays. Origin/Destination reversible.
Note: Frontier is a “Low Cost Carrier” and fares do not include a free carry-on bag. Only a personal item (like a small-backpack) is free. Checked bags cost +$30 to $40 each-way. Seats are randomly assigned (for free) prior to boarding.