Oneworld member airlines American, British Airways and Iberia have Chicago to Athens at $557 to $600 for travel March to May 2018. Lowest ticket prices I see are British Airways AARP discount tickets at $557 and American Airlines tickets at $573.
British Airways AARP discount
Chicago ORD – London LHR – Athens ATH – London LHR – ORD
$557.26 round trip Friday May 4 – Monday May 14
Loyalty Traveler Airfare Deals.
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