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Choose your route and select the additional services you want. (The US DoT has proposed rules requiring airlines to disclose the cost of the first two checked bags, carry on and seat selection.) We'll compare the true cost of round-trip flights on all airlines offering those services. Pricing is updated weekly, based on good deals found over the past four weeks. Airlines are sorted based on total round-trip price including base fare and selected additional services (in both directions). Hover over the colored segments to see individual fee components. Select a result to check availability for specific dates. You can also check out our complete flight guide for ORD-SDF.
We currently have fee information for the following airlines: AirTran Airways, American Airlines, Delta, Frontier, JetBlue, Spirit, United, US Airways, Virgin America, Alaska Airlines, Hawaiian Airlines, Sun Country, Silver Airways, Island Air, Great Lakes Airlines, Cape Air, Era Alaska, SeaPort, Seaborne, Air Choice One, Peninsula Airways, Southwest Airlines, Bering Air and Kenmore Air.

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