What are the cheapest airlines to fly from Illinois to San Juan Luis Munoz Marin Intl Airport one-way?

The cheapest airlines for a one-way flight from Illinois to San Juan Luis Munoz Marin Intl Airport are Frontier ($69), American Airlines ($113), and United Airlines ($114).

In terms of precipitation, rainfall in San Juan Luis Munoz Marin Intl Airport ranges from 2.2 - 6.1 inches per month. November is typically the wettest month, when rainfall can reach 6.1 in. February is typically the driest time to visit San Juan Luis Munoz Marin Intl Airport when rainfall is around 2.2 in.

If weather is an important factor for your trip to San Juan Luis Munoz Marin Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, June is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 77.0 F).

What are the most popular routes from Illinois to San Juan Luis Munoz Marin Intl Airport?

The most popular route from Illinois to San Juan Luis Munoz Marin Intl Airport is Chicago O'Hare Intl - San Juan Luis Munoz Marin Intl. You may also consider Chicago Midway - San Juan Luis Munoz Marin Intl or Lambert-St Louis - San Juan Luis Munoz Marin Intl.

What are the cheapest flights from Illinois to San Juan Luis Munoz Marin Intl Airport?

On average you can expect to pay $680 for a flight from Illinois to San Juan Luis Munoz Marin Intl Airport. The cheapest flight overall is $113 while the most popular route, (Chicago O'Hare Intl - San Juan Luis Munoz Marin Intl) is currently priced at $138.

What are the most reliable airlines from Illinois to San Juan Luis Munoz Marin Intl Airport?

Consider American Airlines (94%), Alaska Airlines (89%) or Spirit Airlines (72%) when booking your flight. These represent the most reliable airlines when flying from Illinois to San Juan Luis Munoz Marin Intl Airport.

What are the most popular airlines that fly from Illinois to San Juan Luis Munoz Marin Intl Airport?

The most popular airlines flying from Illinois to San Juan Luis Munoz Marin Intl Airport are Spirit Airlines, United Airlines and American Airlines. Something to consider prior to booking your flight.

Can I find deals for flights from Illinois to Luis Munoz Marin Intl that include hotel bookings?

Yes. In addition to deals on Illinois to Luis Munoz Marin Intl flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Illinois to Luis Munoz Marin Intl?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Luis Munoz Marin Intl.

Can I find deals for business class flights from Illinois to Luis Munoz Marin Intl?

Yes. Cheapflights offers flight deals from Illinois to Luis Munoz Marin Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$69+ Flights from Illinois to San Juan Luis Munoz Marin Intl Airport

Q: How much does it cost to fly round-trip from Illinois to San Juan Luis Munoz Marin Intl Airport?

Airfare is below average for this route at the moment. Illinois to San Juan Luis Munoz Marin Intl Airport flights typically cost between $250 and $534 in November. The cheapest round-trip price found within the last 3 days was $212 on Multiple Airlines (Nov 20-Nov 23).

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Find flight deals from Illinois to Luis Munoz Marin Intl

Cheapest flights from Illinois to Luis Munoz Marin Intl
Explore the most affordable flight options available from Illinois to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 6, 2025.

Thu 11/2010:12 amORD - SJU

1 stop8h 15mMultiple Airlines

Sun 11/232:25 amSJU - ORD

1 stop10h 46mMultiple Airlines

Deal found 11/3

$212

Tue 12/28:41 amORD - SJU

Nonstop4h 36mSpirit Airlines

Tue 12/96:00 amSJU - ORD

1 stop16h 09mSpirit Airlines

Deal found 11/4

$213

Mon 11/244:58 pmORD - SJU

1 stop15h 51mSpirit Airlines

Thu 12/48:45 pmSJU - ORD

Nonstop5h 14mSpirit Airlines

Deal found 11/4

$215

Thu 11/205:00 amORD - SJU

1 stop13h 27mSpirit Airlines

Thu 12/49:00 amSJU - ORD

Nonstop5h 23mSpirit Airlines

Deal found 11/4

$216

Wed 12/38:41 amORD - SJU

Nonstop4h 36mSpirit Airlines

Sat 12/67:31 pmSJU - ORD

Nonstop5h 22mSpirit Airlines

Deal found 11/4

$217

Tue 11/2511:48 amORD - SJU

1 stop9h 56mMultiple Airlines

Thu 11/274:12 pmSJU - ORD

Nonstop5h 11mMultiple Airlines

Deal found 11/3

$218

Sun 12/76:00 amORD - SJU

1 stop12h 08mMultiple Airlines

Mon 12/84:10 amSJU - ORD

2 stops11h 48mMultiple Airlines

Deal found 11/4

$219

Tue 12/28:41 amORD - SJU

Nonstop4h 36mSpirit Airlines

Fri 12/124:10 amSJU - ORD

2 stops19h 38mSpirit Airlines

Deal found 11/3

$220

Mon 11/178:00 amORD - SJU

Nonstop4h 36mSpirit Airlines

Fri 12/54:10 amSJU - ORD

1 stop8h 58mSpirit Airlines

Deal found 11/4

$221

Thu 12/42:16 pmMDW - SJU

1 stop18h 16mMultiple Airlines

Tue 12/95:00 pmSJU - MDW

2 stops17h 46mMultiple Airlines

Deal found 11/4

$221

Wed 11/197:34 pmORD - SJU

2 stops22h 53mMultiple Airlines

Sun 11/232:25 amSJU - ORD

1 stop10h 46mMultiple Airlines

Deal found 11/5

$222

Mon 11/175:05 amORD - SJU

1 stop8h 14mMultiple Airlines

Thu 11/2011:55 amSJU - ORD

2 stops21h 48mMultiple Airlines

Deal found 11/3

$223

Best flights from Illinois to Luis Munoz Marin Intl
Discover carefully curated flight deals from Illinois to Luis Munoz Marin Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated November 6, 2025.

Sat 1/248:06 pmSTL - SJU

1 stop11h 50mFrontier

Thu 1/2911:05 amSJU - STL

1 stop13h 28mFrontier

Deal found 11/6

$138

Mon 1/262:20 pmORD - SJU

Nonstop4h 40mUnited Airlines

Fri 1/308:35 amSJU - ORD

Nonstop5h 22mUnited Airlines

Deal found 11/6

$216

Tue 12/95:27 pmMLI - SJU

2 stops16h 32mAmerican Airlines

Thu 12/113:45 pmSJU - MLI

1 stop8h 58mAmerican Airlines

Deal found 11/6

$235

Mon 1/262:20 pmMDW - SJU

2 stops8h 15mSouthwest

Fri 1/309:05 amSJU - MDW

1 stop7h 40mSouthwest

Deal found 11/6

$287

Fri 12/124:49 pmORD - SJU

2 stops17h 43mSpirit Airlines

Sun 12/144:10 amSJU - ORD

1 stop8h 58mSpirit Airlines

Deal found 11/6

$346

Wed 12/36:00 amMDW - SJU

1 stop6h 14mDelta

Sat 12/66:38 pmSJU - MDW

1 stop7h 09mDelta

Deal found 11/5

$445

Sat 1/2411:20 amSTL - SJU

2 stops11h 16mUnited Airlines

Thu 1/297:45 amSJU - STL

1 stop10h 07mUnited Airlines

Deal found 11/6

$225

Mon 1/1211:28 amMLI - SJU

1 stop8h 11mAmerican Airlines

Sat 1/176:00 amSJU - MLI

2 stops17h 58mAmerican Airlines

Deal found 11/4

$235

Sun 12/75:36 pmMLI - SJU

2 stops16h 23mAmerican Airlines

Wed 12/108:20 amSJU - MLI

1 stop16h 27mAmerican Airlines

Deal found 11/6

$235

Mon 1/268:50 amBMI - SJU

1 stop10h 49mAmerican Airlines

Sat 1/316:00 amSJU - BMI

2 stops18h 16mAmerican Airlines

Deal found 11/4

$235

Sat 1/243:35 pmORD - SJU

1 stop7h 01mUnited Airlines

Fri 1/302:05 amSJU - ORD

1 stop9h 35mUnited Airlines

Deal found 11/4

$262

Fri 1/305:11 pmSTL - SJU

1 stop14h 44mFrontier

Mon 2/911:05 amSJU - STL

1 stop13h 28mFrontier

Deal found 11/5

$291

Thu 1/292:20 pmMDW - SJU

2 stops8h 15mSouthwest

Tue 2/36:10 amSJU - MDW

2 stops9h 45mSouthwest

Deal found 11/6

$341

Mon 1/52:20 pmORD - SJU

Nonstop4h 40mUnited Airlines

Thu 1/158:35 amSJU - ORD

Nonstop5h 22mUnited Airlines

Deal found 11/5

$292

Sun 1/118:50 amBMI - SJU

1 stop10h 49mAmerican Airlines

Thu 1/158:20 amSJU - BMI

2 stops14h 21mAmerican Airlines

Deal found 11/6

$268

Wed 1/143:45 pmORD - SJU

1 stop6h 50mSouthwest

Fri 1/234:05 pmSJU - ORD

1 stop7h 45mSouthwest

Deal found 11/4

$351

Fri 11/1411:05 amSTL - SJU

1 stop8h 19mFrontier

Sun 11/163:59 amSJU - STL

1 stop7h 41mFrontier

Deal found 11/5

$354

Sun 1/42:20 pmORD - SJU

Nonstop4h 40mUnited Airlines

Tue 1/132:05 amSJU - ORD

1 stop9h 35mUnited Airlines

Deal found 11/6

$298

Tue 1/136:00 amMLI - SJU

1 stop14h 26mAmerican Airlines

Sat 1/177:07 amSJU - MLI

1 stop10h 20mAmerican Airlines

Deal found 11/5

$288

Sat 1/241:45 pmSTL - SJU

2 stops8h 25mSouthwest

Thu 1/295:40 amSJU - STL

2 stops9h 05mSouthwest

Deal found 11/6

$360

Tue 1/275:40 amORD - SJU

1 stop8h 56mUnited Airlines

Wed 3/42:05 amSJU - ORD

1 stop9h 16mUnited Airlines

Deal found 11/4

$311

Sat 12/610:47 amSTL - SJU

1 stop11h 05mAmerican Airlines

Sat 12/136:25 amSJU - STL

1 stop16h 13mAmerican Airlines

Deal found 11/6

$292

Sat 12/66:05 amSTL - SJU

1 stop10h 35mSouthwest

Sat 12/138:50 amSJU - STL

Nonstop5h 10mSouthwest

Deal found 11/6

$363

Wed 1/212:20 pmORD - SJU

Nonstop4h 40mUnited Airlines

Tue 1/272:05 amSJU - ORD

1 stop10h 48mUnited Airlines

Deal found 11/6

$313

Mon 4/276:41 pmMLI - SJU

2 stops16h 54mAmerican Airlines

Fri 5/13:45 pmSJU - MLI

2 stops23h 32mAmerican Airlines

Deal found 11/5

$295

Mon 1/198:55 amORD - SJU

Nonstop4h 45mUnited Airlines

Thu 1/222:05 amSJU - ORD

1 stop9h 35mUnited Airlines

Deal found 11/6

$313

Mon 12/811:23 amBMI - SJU

2 stops20h 46mAmerican Airlines

Thu 12/112:36 pmSJU - BMI

2 stops22h 17mAmerican Airlines

Deal found 11/4

$295

Fri 1/231:50 pmMDW - SJU

2 stops8h 45mSouthwest

Sat 1/316:00 amSJU - MDW

2 stops9h 40mSouthwest

Deal found 11/6

$395

Tue 12/910:50 amMLI - SJU

1 stop8h 10mUnited Airlines

Wed 12/102:05 amSJU - MLI

2 stops11h 45mUnited Airlines

Deal found 11/6

$321

Mon 4/276:41 pmPIA - SJU

2 stops18h 54mAmerican Airlines

Fri 5/13:50 pmSJU - PIA

2 stops25h 02mAmerican Airlines

Deal found 11/4

$295

Last-minute flights from Illinois to Luis Munoz Marin Intl
Discover last-minute flight deals from Illinois to Luis Munoz Marin Intl. Data last updated November 6, 2025 and is based on user searches.

Mon 11/178:00 amORD - SJU

Nonstop4h 36mSpirit Airlines

Fri 12/54:10 amSJU - ORD

1 stop8h 58mSpirit Airlines

Deal found 11/4

$221

Wed 11/197:34 pmORD - SJU

2 stops22h 53mMultiple Airlines

Sun 11/232:25 amSJU - ORD

1 stop10h 46mMultiple Airlines

Deal found 11/5

$222

Thu 11/2010:12 amORD - SJU

1 stop8h 15mMultiple Airlines

Sun 11/232:25 amSJU - ORD

1 stop10h 46mMultiple Airlines

Deal found 11/3

$212

Thu 11/205:00 amORD - SJU

1 stop13h 27mSpirit Airlines

Thu 12/49:00 amSJU - ORD

Nonstop5h 23mSpirit Airlines

Deal found 11/4

$216

Mon 11/244:58 pmORD - SJU

1 stop15h 51mSpirit Airlines

Thu 12/48:45 pmSJU - ORD

Nonstop5h 14mSpirit Airlines

Deal found 11/4

$215

Tue 11/2511:48 amORD - SJU

1 stop9h 56mMultiple Airlines

Thu 11/274:12 pmSJU - ORD

Nonstop5h 11mMultiple Airlines

Deal found 11/3

$218

Tue 12/28:41 amORD - SJU

Nonstop4h 36mSpirit Airlines

Tue 12/96:00 amSJU - ORD

1 stop16h 09mSpirit Airlines

Deal found 11/4

$213

Tue 12/28:41 amORD - SJU

Nonstop4h 36mMultiple Airlines

Thu 1/229:00 pmSJU - ORD

1 stop23h 10mMultiple Airlines

Deal found 11/4

$214

Tue 12/28:41 amORD - SJU

Nonstop4h 36mSpirit Airlines

Fri 12/124:10 amSJU - ORD

2 stops19h 38mSpirit Airlines

Deal found 11/3

$220

Wed 12/38:41 amORD - SJU

Nonstop4h 36mSpirit Airlines

Mon 12/158:45 pmSJU - ORD

Nonstop5h 14mSpirit Airlines

Deal found 11/3

$217

Thu 12/42:16 pmMDW - SJU

1 stop18h 16mMultiple Airlines

Tue 12/95:00 pmSJU - MDW

2 stops17h 46mMultiple Airlines

Deal found 11/4

$221

Sun 12/76:00 amORD - SJU

1 stop12h 08mMultiple Airlines

Mon 12/84:10 amSJU - ORD

2 stops11h 48mMultiple Airlines

Deal found 11/4

$219

One-way flights from Illinois to Luis Munoz Marin Intl
Search for one-way flight options from Illinois to Luis Munoz Marin Intl. Find affordable one-way fares based on user searches. Data last updated November 6, 2025.

Fri 1/912:59 pmSTL - SJU

1 stop9h 46mFrontier

Deal found 11/5

$69

Fri 1/305:11 pmSTL - SJU

1 stop14h 44mFrontier

Deal found 11/6

$84

Tue 1/135:06 pmSTL - SJU

1 stop20h 58mFrontier

Deal found 11/6

$90

Fri 1/237:43 pmSTL - SJU

2 stops17h 23mFrontier

Deal found 11/6

$110

Thu 11/205:00 amORD - SJU

1 stop13h 27mSpirit Airlines

Deal found 11/5

$112

Sun 2/17:51 pmORD - SJU

2 stops17h 15mFrontier

Deal found 11/4

$113

Sun 1/112:01 pmMDW - SJU

2 stops18h 46mFrontier

Deal found 11/6

$113

Tue 2/38:05 amSTL - SJU

2 stops11h 21mUnited Airlines

Deal found 11/6

$113

Tue 1/135:40 amORD - SJU

1 stop8h 56mUnited Airlines

Deal found 11/4

$114

Tue 1/2010:53 amMDW - SJU

1 stop10h 51mDelta

Deal found 11/5

$114

Thu 11/276:00 amORD - SJU

1 stop17h 06mFrontier

Deal found 11/4

$115

Thu 12/49:14 pmORD - SJU

2 stops25h 35mMultiple Airlines

Deal found 11/5

$116

Cheap flight deals from Illinois to Luis Munoz Marin Intl

Round-trip from	$133 (Frontier)
One-way from	$69 (Priceline)
Popular in	December
Cheapest in	April
Average price	$381
Good round-trip deal	$358 or less
Good one-way deal	$181 or less

From Illinois to San Juan Luis Munoz Marin Intl

Search Deals

One-way flight from Illinois to San Juan Luis Munoz Marin Intl

Search Deals

Highest demand for flights based on searches. 7% potential increase in price ($33 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($15 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in November 2025

Search Deals

Price to beat on a round-trip flight from Illinois to San Juan Luis Munoz Marin Intl.

Search Deals

Price to beat on a one-way flight from Illinois to San Juan Luis Munoz Marin Intl.

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Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to San Juan Luis Munoz Marin Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 1/24

8:06 pm-9:56 am

1 stop11h 50m

San Juan Luis Munoz Marin Intl

Thu 1/29

11:05 am-10:33 pm

1 stop13h 28m

$138

ChicagoSan Juan

ORD - SJU

ORDSJU

Chicago O'Hare Intl

Mon 1/26

2:20 pm-9:00 pm

Nonstop4h 40m

San Juan Luis Munoz Marin Intl

Fri 1/30

8:35 am-11:57 am

Nonstop5h 22m

$216

St. LouisSan Juan

STL - SJU

STLSJU

Lambert-St Louis

Sat 1/24

11:20 am-12:36 am

2 stops11h 16m

San Juan Luis Munoz Marin Intl

Thu 1/29

7:45 am-3:52 pm

1 stop10h 07m

$225

MolineSan Juan

MLI - SJU

MLISJU

Moline Quad-City

Tue 12/9

5:27 pm-11:59 am

2 stops16h 32m

San Juan Luis Munoz Marin Intl

Thu 12/11

3:45 pm-10:43 pm

1 stop8h 58m

$235

MolineSan Juan

MLI - SJU

MLISJU

Moline Quad-City

Mon 1/12

11:28 am-9:39 pm

1 stop8h 11m

San Juan Luis Munoz Marin Intl

Sat 1/17

6:00 am-9:58 pm

2 stops17h 58m

$235

MolineSan Juan

MLI - SJU

MLISJU

Moline Quad-City

Sun 12/7

5:36 pm-11:59 am

2 stops16h 23m

San Juan Luis Munoz Marin Intl

Wed 12/10

8:20 am-10:47 pm

1 stop16h 27m

$235

BloomingtonSan Juan

BMI - SJU

BMISJU

Bloomington-Normal

Mon 1/26

8:50 am-9:39 pm

1 stop10h 49m

San Juan Luis Munoz Marin Intl

Sat 1/31

6:00 am-10:16 pm

2 stops18h 16m

$235

ChicagoSan Juan

ORD - SJU

ORDSJU

Chicago O'Hare Intl

Sat 1/24

3:35 pm-12:36 am

1 stop7h 01m

San Juan Luis Munoz Marin Intl

Fri 1/30

2:05 am-9:40 am

1 stop9h 35m

$262

BloomingtonSan Juan

BMI - SJU

BMISJU

Bloomington-Normal

Sun 1/11

8:50 am-9:39 pm

1 stop10h 49m

San Juan Luis Munoz Marin Intl

Thu 1/15

8:20 am-8:41 pm

2 stops14h 21m

$268

ChicagoSan Juan

MDW - SJU

MDWSJU

Chicago Midway

Mon 1/26

2:20 pm-12:35 am

2 stops8h 15m

San Juan Luis Munoz Marin Intl

Fri 1/30

9:05 am-2:45 pm

1 stop7h 40m

$287

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/5

Showing 1-10 of 60 results

...

Best time to book a flight from Illinois to Luis Munoz Marin Intl

Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl from Illinois with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to San Juan Luis Munoz Marin Intl Airport

What is the cheapest month to book a flight from Illinois to San Juan Luis Munoz Marin Intl Airport?

Currently, February is the cheapest month in which you can book a flight from Illinois to San Juan Luis Munoz Marin Intl Airport (average of $127). Flying from Illinois to San Juan Luis Munoz Marin Intl Airport in December is currently the most expensive (average of $188). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from IL to SJU?

When flying from Illinois to San Juan Luis Munoz Marin Intl Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 48% versus a flight in the morning.

What is the cheapest day to fly from Illinois to San Juan Luis Munoz Marin Intl Airport?

Travelers seeking maximum savings on their Illinois to San Juan Luis Munoz Marin Intl Airport flight should consider departing on Tuesday mornings when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Illinois to San Juan Luis Munoz Marin Intl Airport

The most flights from USIL to SJU are scheduled on a Monday (8 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (6 on average).

How much does it cost to fly round-trip from Illinois to San Juan Luis Munoz Marin Intl Airport?

Related info for your journey

How long is the flight from Illinois to San Juan Luis Munoz Marin Intl Airport?
Frontier, United Airlines, and American Airlines can get you from Illinois to San Juan Luis Munoz Marin Intl Airport in just under 4h 40m. Your travel time can differ by up to 11h 52m. There are 2073 mi between Illinois and San Juan Luis Munoz Marin Intl Airport. Both multi-stop and nonstop flights can be found to your destination and back.
What are the cheapest airlines to fly from Illinois to San Juan Luis Munoz Marin Intl Airport one-way?
The cheapest airlines for a one-way flight from Illinois to San Juan Luis Munoz Marin Intl Airport are Frontier ($69), American Airlines ($113), and United Airlines ($114).
What are the most popular routes from Illinois to San Juan Luis Munoz Marin Intl Airport?
The most popular route from Illinois to San Juan Luis Munoz Marin Intl Airport is Chicago O'Hare Intl - San Juan Luis Munoz Marin Intl. You may also consider Chicago Midway - San Juan Luis Munoz Marin Intl or Lambert-St Louis - San Juan Luis Munoz Marin Intl.
What are the most reliable airlines from Illinois to San Juan Luis Munoz Marin Intl Airport?
Consider American Airlines (94%), Alaska Airlines (89%) or Spirit Airlines (72%) when booking your flight. These represent the most reliable airlines when flying from Illinois to San Juan Luis Munoz Marin Intl Airport.
What are the cheapest flights from Illinois to San Juan Luis Munoz Marin Intl Airport?
On average you can expect to pay $680 for a flight from Illinois to San Juan Luis Munoz Marin Intl Airport. The cheapest flight overall is $113 while the most popular route, (Chicago O'Hare Intl - San Juan Luis Munoz Marin Intl) is currently priced at $138.
Can I find deals for flights from Illinois to Luis Munoz Marin Intl that include hotel bookings?
Yes. In addition to deals on Illinois to Luis Munoz Marin Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Illinois to Luis Munoz Marin Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Luis Munoz Marin Intl.
Can I find deals for business class flights from Illinois to Luis Munoz Marin Intl?
Yes. Cheapflights offers flight deals from Illinois to Luis Munoz Marin Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.
What is the cheapest month to book a flight from Illinois to San Juan Luis Munoz Marin Intl Airport?
Currently, February is the cheapest month in which you can book a flight from Illinois to San Juan Luis Munoz Marin Intl Airport (average of $127). Flying from Illinois to San Juan Luis Munoz Marin Intl Airport in December is currently the most expensive (average of $188). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Humacao

Luquillo

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Top 7 airlines flying from Illinois to Luis Munoz Marin Intl

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$106	Average$288	FlexibilityNo cancel fee	On-time62%
Spirit Airlines	Cheapest$139	Average$318	FlexibilityNo cancel fee	On-time65%
Delta	Cheapest$196	Average$406	FlexibilityNo cancel fee	On-timeN/A
American Airlines	Cheapest$225	Average$583	FlexibilityNo cancel fee	On-time71%
JetBlue	Cheapest$271	Average$406	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$276	Average$510	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$380	Average$490	FlexibilityNo cancel fee	On-time63%

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$69+ Cheap flights from Illinois to Luis Munoz Marin Intl (SJU)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/18. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Illinois to Luis Munoz Marin Intl with Cheapflights

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Find flight deals from Illinois to Luis Munoz Marin Intl

Cheapest flights from Illinois to Luis Munoz Marin IntlExplore the most affordable flight options available from Illinois to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 6, 2025.

Explore the most affordable flight options available from Illinois to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 6, 2025.

Cheap flight deals from Illinois to Luis Munoz Marin Intl

Keep the following information in mind while searching for Illinois to Luis Munoz Marin Intl flight deals. Data was last updated November 6, 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to San Juan Luis Munoz Marin Intl Airport that are best for you.

Best time to book a flight from Illinois to Luis Munoz Marin Intl

Have a flexible travel schedule? Discover the best time to fly to Luis Munoz Marin Intl from Illinois with our price prediction graph.

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Everything you need to know about your flight from Illinois to San Juan Luis Munoz Marin Intl Airport

What is the cheapest month to book a flight from Illinois to San Juan Luis Munoz Marin Intl Airport?

What is the cheapest time of day to fly from IL to SJU?

Find hourly flight availability from Illinois to Luis Munoz Marin Intl. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated November 6, 2025.

What is the cheapest day to fly from Illinois to San Juan Luis Munoz Marin Intl Airport?

Use this chart to determine the cheapest time to fly round-trip from Illinois to Luis Munoz Marin Intl. Price data was last updated on December 16, 2024.

Weekly flight availability from Illinois to San Juan Luis Munoz Marin Intl Airport

How much does it cost to fly round-trip from Illinois to San Juan Luis Munoz Marin Intl Airport?

Related info for your journey

Find useful and relevant information for your journey from Illinois to Luis Munoz Marin Intl. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

How long is the flight from Illinois to San Juan Luis Munoz Marin Intl Airport?

What are the cheapest airlines to fly from Illinois to San Juan Luis Munoz Marin Intl Airport one-way?

What are the most popular routes from Illinois to San Juan Luis Munoz Marin Intl Airport?

What are the most reliable airlines from Illinois to San Juan Luis Munoz Marin Intl Airport?

What are the cheapest flights from Illinois to San Juan Luis Munoz Marin Intl Airport?

Can I find deals for flights from Illinois to Luis Munoz Marin Intl that include hotel bookings?

How can I find direct flights from Illinois to Luis Munoz Marin Intl?

Can I find deals for business class flights from Illinois to Luis Munoz Marin Intl?

What is the cheapest month to book a flight from Illinois to San Juan Luis Munoz Marin Intl Airport?

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Alternative routes for Illinois to Luis Munoz Marin Intl

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Top 7 airlines flying from Illinois to Luis Munoz Marin Intl

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Cheapest flights from Illinois to Luis Munoz Marin Intl
Explore the most affordable flight options available from Illinois to Luis Munoz Marin Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on November 6, 2025.