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Cheap Flights to St. Denis
|Popular in||December||High demand for flights, 15% potential price rise|
|Cheapest in||July||Best time to find cheap flights, 5% potential price drop|
|Average price||$1,472||Average for round-trip flights in July 2020|
Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.