Roundtrip New York to Ontario CA Southwest Airlines Airfares

No special codes or coupons are required. Get these roundtrip New York to Ontario CA Southwest Airlines airfares while availability lasts.

Roundtrip flights are available between New York (LGA) and Ontario (ONT) starting at $136, or one-way for $68, with one stop each way. These are basic economy fares, which include a personal item and a carry-on bag. Seat selection is not included, and Southwest no longer offers free checked bags with this fare type.

Travel Availability

• Departing LGA: December 6; January 13-14, 17, 21, 24, 27-28, 31; February 3-4, 10-11, 18, 24-25; March 3-4
• Departing ONT: December 9-10, 16; January 7, 13-14, 20-21, 24, 27-28, 31; February 3-4, 10-11, 18, 24-25; March 3-4

This deal expires on March 31, 2026.