AirHint found the following cheapest return flights from Chicago (ORD) to St. Thomas (STT) in December 2025 (see full year).

Return flights

07 Dec - 25 Dec	Spirit Airlines
31 Dec - 07 Jan	Frontier Airlines
14 Dec - 18 Dec	United	direct
13 Dec - 20 Dec	United
07 Dec - 24 Dec	Spirit Airlines
31 Dec - 06 Jan	Frontier Airlines
13 Dec - 16 Dec	United
07 Dec - 23 Dec	Spirit Airlines
18 Dec - 21 Dec	United
18 Dec - 24 Dec	United
18 Dec - 22 Dec	United
18 Dec - 23 Dec	United
31 Dec - 09 Jan	Spirit Airlines
07 Dec - 17 Jan	Frontier Airlines
30 Dec - 06 Jan	Frontier Airlines
30 Dec - 09 Jan	Spirit Airlines
29 Dec - 06 Jan	Frontier Airlines
31 Dec - 17 Jan	Spirit Airlines
08 Dec - 18 Jan	Spirit Airlines
29 Dec - 05 Jan	Frontier Airlines

Also check the deals for one-way flights from Chicago to St. Thomas in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Chicago to St. Thomas in December from 315€

Return flights