Cheap flights from Illinois to San Diego from $41
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to San Diego departing on 6/25. 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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Spirit Airlines flights from Illinois to San Diego
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American Airlines flights from Illinois to San Diego
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How to get the cheapest flight ticket from Illinois to San Diego
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 San Diego?
If you are unable to visit San Diego during the month of September, then departing from Illinois during the month June is also very affordable. Most momondo users find prices during this month for around $367.
What is the cheapest day to depart on your flight to San Diego?
The cheapest day to depart from Illinois to San Diego is on a Wednesday. Travelers who choose to depart for San Diego on a Wednesday will often find tickets for as low as $413. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $471. These prices are subject to change though, so be sure to set up a Price Alert for flights to San Diego.
What is the cheapest time of day to depart on your flight to San Diego?
The cheapest time of day to fly to San Diego is at noon when flights can be purchased for as low as $403. Flights in the evening are often more expensive with an average ticket price of $465.
What is the cheapest Illinois to San Diego flight route?
Fly from Chicago O'Hare Intl to San Diego for the best Illinois - San Diego flight prices
How far in advance should I book a flight to San Diego?
You are more likely to see cheaper flights to San Diego from Illinois when booking 11 weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around $414 when searching 11 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from Illinois for as low as $318 on momondo.
What cabin class options are available on Illinois to San Diego flights?
There are 4 cabin classes available to choose from on Illinois to San Diego 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 Illinois to San Diego?
Spirit Airlines, Frontier, and Southwest are the most popular carriers operating from Illinois to San Diego
What airlines fly to San Diego?
American Airlines, United Airlines and Frontier are the top three most popular airlines that fly to San Diego from Illinois according to our data. American Airlines is the first choice among our users, with 58% of people opting to fly with this airline when traveling to San Diego. Keep in mind that there are 7 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.
How many flights depart from Illinois to San Diego on average per day?
38 flights are operational daily from Illinois to San Diego as of June 2025. The most popular departure time for this route is 4:00PM, with 38% of flights per day taking off in the afternoon.
How many flights depart from Illinois to San Diego on average per week?
As of June 2025, there are 267 flights per week flying from Illinois to San Diego. The most common day of the week flights depart is Thu, with 18% of flights taking off on this day.
Cheap Illinois to San Diego flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Illinois to San Diego
When did momondo last update prices for flights from Illinois to San Diego Airport?
Prices for flights from Illinois to San Diego Airport were last updated today.
How many operators does momondo search for flights from Illinois to San Diego Airport?
As of June 2025, there are 7 operators available to choose from for flights from Illinois to San Diego Airport.
How old do you have to be to fly from Illinois to San Diego Airport?
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 Illinois to San Diego Airport.
What documentation or ID do you need to fly to San Diego Airport?
The required travel and health documents for your San Diego Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at San Diego Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Illinois to San Diego?
momondo data reveals that the most frequently booked plane model on the route from Illinois to San Diego is Boeing 737-800, representing 33.35% of all bookings. The subsequent popular models are Airbus A321-100/200 at 15.46%, Airbus A321neo at 13.80%, and Boeing 737 MAX 8 at 10.68%.
Best airlines flying from Illinois to San Diego
Compare and see reviews for airlines that fly from Illinois to San Diego with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $97 | Free Cancellation | Rating 6.3 8,034 reviews | |||
| PriceFrom $108 | Free Cancellation | Rating 5.9 3,291 reviews | |||
| PriceFrom $215 | Free Cancellation | Rating 8.0 4,288 reviews | |||
| PriceFrom $216 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $236 | Free Cancellation | Rating 8.0 7,956 reviews | |||
| PriceFrom $246 | Free Cancellation | Rating 8.0 10,000 reviews | |||
| PriceFrom $246 | Free Cancellation | Rating 7.4 8,774 reviews |
Traveling to a place near San Diego?
Book flights to San Diego if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Illinois to San Diego?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to San Diego. momondo saves you time and could save you money on your trip.
Can I find flights from Illinois to San Diego with flexible booking policies on momondo?
momondo does allow users to show only those flights to San Diego from Illinois which offer a flexible booking policy as well as other useful filters and features.
How can momondo help me find flights from Illinois to San Diego?
Once all potential Illinois to San Diego flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Illinois to San Diego right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of Illinois to San Diego flights. All you need is a valid email address and we will do the rest; it is that quick and easy.