How does KAYAK find such low prices on flights from Illinois to San Juan?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to San Juan. Visit our flight page for the latest deals!>/a>

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to San Juan?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Juan from Illinois is likely to change within 7 days, so travelers know whether to wait or book now. Visit our flight page for the latest deals!>/a>

What is the Hacker Fare option on flights from Illinois to San Juan?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Juan with an airline and back to Illinois with another airline. Visit our flight page for the latest deals!>/a>

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to San Juan?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Juan from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best. Visit our flight page for the latest deals!>/a>

$101 CHEAP FLIGHTS from Illinois to San Juan (SJU)

SJU

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Cheap Flight Deals from Illinois to San Juan

Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Illinois to San Juan that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Illinois to San Juan

KAYAK's recommended round-trip deals from the most popular airlines that fly from Illinois to San Juan.

Discover the best prices for you by selecting your travel dates on KAYAK.

Choose your dates

8:44 am - 4:46 pmSTL-SJU

7h 02m1 stop

5:41 pm - 7:49 amSJU-STL

15h 08m1 stop

$201Spirit Airlines

Find Deal

Fri, Aug 8 - Sun, Aug 17

1:25 pm - 6:50 pmSTL-SJU

4h 25mnonstop

2:20 pm - 9:45 pmSJU-STL

8h 25m1 stop

$205Southwest

Find Deal

Sat, May 3 - Sat, May 10

9:41 am - 5:00 amSTL-SJU

18h 19m1 stop

7:15 am - 11:51 pmSJU-STL

17h 36m2 stops

$250American Airlines

Find Deal

Sat, May 3 - Sat, May 10

3:43 pm - 11:54 pmSTL-SJU

7h 11m1 stop

7:45 am - 3:47 pmSJU-STL

9h 02m1 stop

$261United Airlines

Find Deal

Sat, May 3 - Sat, May 10

5:55 pm - 2:51 amSTL-SJU

7h 56m1 stop

8:12 pm - 9:15 amSJU-STL

14h 03m1 stop

$265

Find Deal

Fri, May 9 - Fri, May 16

4:05 pm - 11:15 pmSTL-SJU

6h 10m1 stop

4:15 pm - 11:26 pmSJU-STL

8h 11m1 stop

$274Delta

Find Deal

Mon, May 5 - Sat, May 10

11:53 am - 11:39 pmORD-SJU

10h 46m1 stop

3:56 am - 11:32 pmSJU-ORD

20h 36m1 stop

$279

Find Deal

Tue, May 6 - Fri, May 9

3:44 pm - 5:00 amSTL-SJU

12h 16m1 stop

6:30 am - 7:29 pmSJU-STL

13h 59m1 stop

$283American Airlines

Find Deal

Sat, May 3 - Wed, May 7

6:15 am - 3:42 pmSTL-SJU

8h 27m1 stop

1:05 am - 10:38 amSJU-STL

10h 33m1 stop

$287United Airlines

Find Deal

Sun, Sep 14 - Fri, Sep 19

6:00 am - 1:29 pmORD-SJU

6h 29m1 stop

7:00 am - 5:39 pmSJU-ORD

11h 39m1 stop

$307Delta

Find Deal

Mon, Aug 25 - Sat, Sep 6

Low season	September
High season	December
Cheapest flight	$101

Best time to beat the crowds with an average 14% drop in price.

Most popular time to fly with an average 38% increase in price.

Flight from St. Louis to San Juan

How does KAYAK find such low prices on flights from Illinois to San Juan?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Illinois to San Juan.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Illinois to San Juan?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to San Juan from Illinois is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Illinois to San Juan?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to San Juan with an airline and back to Illinois with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Illinois to San Juan?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to San Juan from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.