Sky Club memberships cost $495 a year.
Clear memberships normally cost $179 a year, but through a partnership with Delta SkyMiles members pay $99 a year or less depending on their elite status with the frequent flier program.
Delta has three scanners at the Reagan Sky Club to allow frequent flier members enrolled in Clear to use their fingerprints as proof of identity.
Eventually, the airline plans to let members use fingerprints to check bags and board flights.
"We're rapidly moving toward a day when your fingerprint, iris or face will become the only ID you'll need for any number of transactions throughout a given day," said Delta chief operating officer Gil West in a written statement.
Delta said it will study findings from the test to determine next steps.
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