Cheap flights from Illinois to San Juan from $122

If you aren’t able to travel to San Juan Luis Munoz Marin Intl Airport during the month of August, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $347.

On average, the least expensive day to fly to San Juan Luis Munoz Marin Intl Airport from Illinois is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $416. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Thursday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $504.

The cheapest time of day to fly to San Juan Luis Munoz Marin Intl Airport is in the evening when flights can be purchased for as low as $366. Flights in the morning are often more expensive with an average ticket price of $522.

Fly from Chicago O'Hare Intl to San Juan Luis Munoz Marin Intl for the best Illinois - San Juan Luis Munoz Marin Intl flight prices

You are more likely to see cheaper flights to San Juan Luis Munoz Marin Intl Airport from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to San Juan Luis Munoz Marin Intl Airport for around $406 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Juan Luis Munoz Marin Intl Airport from Illinois for as low as $361 on momondo.

There are 4 cabin classes available to choose from on Illinois to San Juan Luis Munoz Marin Intl Airport flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Frontier, Southwest, and Delta are the most popular carriers operating from Illinois to San Juan Luis Munoz Marin Intl

United Airlines, American Airlines and Frontier are the top three most popular airlines that fly to San Juan Luis Munoz Marin Intl Airport from Illinois according to our data. United Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to San Juan Luis Munoz Marin Intl Airport. Keep in mind that there are 6 different airlines that fly to San Juan Luis Munoz Marin Intl Airport on a routine basis, so you have a few additional options to choose from.

4 flights are operational daily from Illinois to San Juan Luis Munoz Marin Intl Airport as of October 2026. The most popular departure time for this route is 8:00AM, with 100% of flights per day taking off at noon.

As of October 2026, there are 28 flights per week flying from Illinois to San Juan Luis Munoz Marin Intl Airport. The most common day of the week flights depart is Wed, with 29% of flights taking off on this day.