AirHint found the following cheapest return flights from Chicago (ORD) to San Juan (SJU) in March 2026 (see full year).

Return flights

07 Mar - 14 Mar	Southwest Airlines
14 Mar - 18 Mar	Southwest Airlines
13 Mar - 20 Mar	United
18 Mar - 22 Mar	Southwest Airlines
13 Mar - 23 Mar	United	direct
14 Mar - 22 Mar	Southwest Airlines
23 Mar - 27 Mar	Delta
07 Mar - 14 Mar	United	direct
19 Mar - 23 Mar	United
26 Mar - 02 Apr	United	direct
15 Mar - 28 Mar	United
29 Mar - 05 Apr	Southwest Airlines
28 Mar - 03 Apr	Avianca

Also check the deals for one-way flights from Chicago to San Juan in March.

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 San Juan in March from 375€

Return flights