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Southwest's 72-hour sale offers round-trip Detroit fares under $100

One-way ticket to Chicago are $49 between Aug. 22 and Dec. 13

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Southwest is offering deals on flights from Detroit with some shorter routes falling to less than $100 for a round-trip ticket. The twice-per-year 72-hour sale took off Tuesday morning. 

Here's the deals for Detroit: 

From Detroit,

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There's also a $49 one-way ticket from Flint to Chicago Midway, and one-way flights from Grand Rapids to Baltimore for $79 and Grand Rapids to Denver for $129. 

You can see the full list of discounted flights here.

The three-day sale is for travel between Aug. 22 and Dec. 13. Tickets must be booked by Thursday, June 8.