This is live pricing from Travelpayouts' aggregation of 40+ booking engines. The $611 fare is the cheapest current round-trip from Chicago (ORD) to CUN on Y4 flight Y45703, departing 2026-07-30 at 02:53 with return on 2026-08-03.

Clicking "Book this flight" opens Kiwi.com with this exact flight pre-filtered — same airline, same dates, same passenger count.