Is it really worth flying to Cancun instead of directly to Cozumel?

Yes. You'll typically save $200-400 per person even after paying for the ferry. The ferry runs every hour and takes 45 minutes, so it's not a major inconvenience.

When are flights most expensive?

Christmas week, spring break (March), and US summer holidays. Flights can cost 2-3x normal prices during these periods.

Should I book through the airline or a third-party site?

Compare both but book directly with the airline when prices are similar. You'll get better customer service if flights get canceled or delayed.

How far in advance can I book?

Airlines typically open booking 330 days out, but prices aren't optimized until about 10 weeks before departure. Don't book earlier than 10 weeks unless you find an exceptional deal.

How to book cheap flights to Cancun and Cozumel

Book flights to Cancun (CUN) instead of Cozumel (CZM) and take the ferry across — you'll save $200-400 per ticket. Fly Tuesday-Thursday, book 6-8 weeks ahead, and use flexible date searches to find the best deals.

Choose Cancun over Cozumel airport. Always search flights to Cancun (CUN) first. Cozumel's airport (CZM) has limited flights and costs $200-400 more per ticket. From Cancun, you can reach Cozumel via a 45-minute ferry ride for $24 each way.
Search flexible dates. Use Google Flights' calendar view to see prices across 2-3 months. Tuesday-Thursday departures typically cost $50-150 less than weekend flights. Avoid Mexican holidays like Day of the Dead (November) and Christmas week.
Book 6-8 weeks ahead. Sweet spot for Mexico flights is 42-56 days in advance. Earlier than 10 weeks and you pay premium pricing. Later than 3 weeks and last-minute fares kick in.
Check multiple airports. If flying from major US cities, compare prices from nearby airports. From NYC area, check JFK, LGA, and EWR. From LA, try LAX and Burbank. Price differences can be $100+ per ticket.
Consider connecting flights. Direct flights to Cancun cost $100-200 more than one-stop options through Mexico City, Houston, or Miami. If you don't mind 3-4 hours extra travel time, you'll save significantly.
Book round-trip. Mexico flights are almost always cheaper as round-trips. One-way tickets cost 70-80% of round-trip price, making them poor value unless you're doing multi-destination travel.

Is it really worth flying to Cancun instead of directly to Cozumel?: Yes. You'll typically save $200-400 per person even after paying for the ferry. The ferry runs every hour and takes 45 minutes, so it's not a major inconvenience.
When are flights most expensive?: Christmas week, spring break (March), and US summer holidays. Flights can cost 2-3x normal prices during these periods.
Should I book through the airline or a third-party site?: Compare both but book directly with the airline when prices are similar. You'll get better customer service if flights get canceled or delayed.
How far in advance can I book?: Airlines typically open booking 330 days out, but prices aren't optimized until about 10 weeks before departure. Don't book earlier than 10 weeks unless you find an exceptional deal.