Cheap flights from San Diego to Illinois from $50
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from San Diego to Illinois departing on 7/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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How to get the cheapest flight ticket from San Diego to Illinois
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest month to fly to Illinois?
The cheapest month to fly to Illinois from San Diego is in June. Flight prices, which tend to average around $317, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of June, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $326.
What is the cheapest day to depart on your flight to Illinois?
The cheapest day to depart from San Diego to Illinois is on a Thursday when prices can be found for as low as $452. Flights from San Diego to Illinois on a Sunday will generally be more expensive and average around $613. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.
What is the cheapest time of day to depart on your flight to Illinois?
Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from San Diego to Illinois during this time can be as low as $358. Flights in the morning are often more expensive with an average ticket price of $528.
What is the cheapest San Diego to Illinois flight route?
Fly from San Diego to Chicago O'Hare Intl for the best San Diego - Illinois flight prices
How far in advance should I book a flight to Illinois?
You are more likely to see cheaper flights to Illinois from San Diego when booking 15 weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $398 when searching 15 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from San Diego for as low as $307 on momondo.
What cabin class options are available on San Diego to Illinois flights?
There are 4 cabin classes available to choose from on San Diego to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from San Diego to Illinois?
Spirit Airlines, Frontier, and United Airlines are the most popular carriers operating from San Diego to Illinois
What airlines fly to Illinois?
American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to Illinois from San Diego according to our data. American Airlines is the first choice among our users, with 53% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 7 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.
How many flights depart from San Diego to Illinois on average per day?
As of June 2025, 55 flights take off from San Diego and land in Illinois each day. The most common flight departure time for this route is 6:00AM, with 50% of daily flights taking off at noon.
How many flights depart from San Diego to Illinois on average per week?
389 flights are operational weekly from San Diego to Illinois as of June 2025. The most popular departure day for this route is Fri, with 15% of flights per week taking off on this day.
Cheap San Diego to Illinois flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from San Diego to Illinois
When did momondo last update prices for flights from San Diego Airport to Illinois?
Prices for flights from San Diego Airport to Illinois refresh daily.
How many operators does momondo search for flights from San Diego Airport to Illinois?
As of June 2025, there are 7 operators available to choose from for flights from San Diego Airport to Illinois.
How old do you have to be to fly from San Diego Airport to Illinois?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from San Diego Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents you'll need for your trip to Illinois may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Illinois. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from San Diego to Illinois?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from San Diego to Illinois is Boeing 737-800 (31.05% of total bookings). The next most popular plane models are Airbus A321-100/200 (13.06%), Airbus A321neo (12.16%), and Boeing 737 MAX 8 (8.47%).
Best airlines flying from San Diego to Illinois
Compare and see reviews for airlines that fly from San Diego to Illinois with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $92 | Free Cancellation | Rating 6.3 8,060 reviews | |||
| PriceFrom $109 | Free Cancellation | Rating 5.9 3,296 reviews | |||
| PriceFrom $217 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $238 | Free Cancellation | Rating 7.4 8,801 reviews | |||
| PriceFrom $258 | Free Cancellation | Rating 8.0 7,963 reviews | |||
| PriceFrom $306 | Free Cancellation | Rating 8.0 4,278 reviews | |||
| PriceFrom $391 | Free Cancellation | Rating 8.0 10,000 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from San Diego to Illinois?
It is quick and easy to find San Diego to Illinois flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Illinois that suits you.
Can I find flights from San Diego to Illinois with flexible booking policies on momondo?
Flights from San Diego to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.
How can momondo help me find flights from San Diego to Illinois?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from San Diego.
I’m not ready to book a flight from San Diego to Illinois right now. Can momondo alert me if prices change?
If you are not ready to book a flight from San Diego to Illinois now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Illinois and let you know when they change.