How does KAYAK find such low prices on flights from Missouri to Ontario?

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 Missouri to Ontario.

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

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Missouri 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 Missouri to Ontario?

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 Ontario with an airline and back to Missouri with another airline.

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

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 Ontario from Missouri up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$84 CHEAP FLIGHTS from Missouri to Ontario

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Flight Deals

Cheap Flights from Missouri to Ontario

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

Round-trip

One-way

Last minute

Recent round-trip flight deals from Missouri to Ontario

Fri, Dec 4 - Tue, Dec 8

8:29 pm - 10:17 pmMCI Kansas City-ONT Ontario

27h 48m1 stop Denver Intl

6:00 am - 7:35 pmONT Ontario-MCI Kansas City

11h 35m1 stop Denver Intl

$186Frontier

Mon, Dec 7 - Tue, Dec 15

7:54 pm - 10:17 pmSTL Lambert-St Louis-ONT Ontario

28h 23m1 stop Denver Intl

6:00 am - 11:04 amONT Ontario-STL Lambert-St Louis

27h 04m1 stop Denver Intl

$204Frontier

Sat, Jan 30 - Wed, Feb 3

7:02 pm - 12:05 amSTL Lambert-St Louis-ONT Ontario

7h 03m1 stop Denver Intl

4:29 pm - 3:08 pmONT Ontario-STL Lambert-St Louis

20h 39m1 stop Seattle/Tacoma Intl

$316Multiple Airlines

Mon, Dec 7 - Mon, Dec 14

7:54 pm - 10:17 pmSTL Lambert-St Louis-ONT Ontario

28h 23m1 stop Denver Intl

6:00 am - 11:59 pmONT Ontario-STL Lambert-St Louis

15h 59m1 stop Seattle/Tacoma Intl

$340Multiple Airlines

Fri, Jan 8 - Wed, Jan 13

10:28 am - 10:15 pmCOU Columbia Regional-ONT Ontario

13h 47m2 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl

9:28 am - 9:40 pmONT Ontario-COU Columbia Regional

10h 12m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

$379American Airlines

Fri, Jan 8 - Wed, Jan 13

10:28 am - 10:15 pmCOU Columbia Regional-ONT Ontario

13h 47m2 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl

6:20 am - 6:51 pmONT Ontario-COU Columbia Regional

10h 31m2 stops Phoenix Sky Harbor Intl Chicago O'Hare Intl

$379American Airlines

Thu, Dec 10 - Thu, Dec 17

3:25 pm - 9:25 pmSTL Lambert-St Louis-ONT Ontario

8h 00m2 stops Las Vegas Harry Reid Intl Oakland

11:15 am - 7:40 pmONT Ontario-STL Lambert-St Louis

6h 25m2 stops Las Vegas Harry Reid Intl Denver Intl

$399Southwest

Sat, Dec 5 - Sat, Dec 12

6:00 am - 12:34 pmMCI Kansas City-ONT Ontario

8h 34m2 stops Chicago O'Hare Intl Denver Intl

5:00 am - 4:19 pmONT Ontario-MCI Kansas City

9h 19m2 stops Denver Intl Chicago O'Hare Intl

$401United Airlines

Sat, Jan 30 - Wed, Feb 3

6:45 am - 12:05 pmSTL Lambert-St Louis-ONT Ontario

7h 20m2 stops Denver Intl Las Vegas Harry Reid Intl

7:40 am - 4:25 pmONT Ontario-STL Lambert-St Louis

6h 45m2 stops Phoenix Sky Harbor Intl Denver Intl

$441Southwest

Wed, Dec 9 - Wed, Dec 16

9:10 am - 5:36 pmSGF Springfield-Branson-ONT Ontario

10h 26m2 stops Denver Intl San Francisco

6:00 am - 4:21 pmONT Ontario-SGF Springfield-Branson

8h 21m2 stops San Francisco Denver Intl

$441United Airlines

Recent last minute flight deals from Missouri to Ontario

Sat, Nov 14 - Sat, Dec 12

8:43 pm - 10:35 amMCI Kansas City-ONT Ontario

15h 52m1 stop Denver Intl

11:30 am - 7:35 pmONT Ontario-MCI Kansas City

6h 05m1 stop Denver Intl

$325Frontier

Wed, Nov 18 - Wed, Nov 25

4:18 pm - 11:51 pmSTL Lambert-St Louis-ONT Ontario

9h 33m1 stop Denver Intl

2:01 pm - 4:20 pmONT Ontario-STL Lambert-St Louis

24h 19m1 stop Las Vegas Harry Reid Intl

$348Frontier

Wed, Nov 18 - Wed, Dec 2

4:18 pm - 11:51 pmSTL Lambert-St Louis-ONT Ontario

9h 33m1 stop Denver Intl

8:00 am - 1:07 pmONT Ontario-STL Lambert-St Louis

27h 07m1 stop Las Vegas Harry Reid Intl

$349Frontier

Tue, Nov 17 - Wed, Mar 24

2:55 pm - 9:40 pmSGF Springfield-Branson-ONT Ontario

8h 45m1 stop Houston George Bush Intcntl

5:00 am - 12:52 pmONT Ontario-SGF Springfield-Branson

5h 52m1 stop Denver Intl

$474United Airlines

Tue, Nov 17 - Wed, Mar 24

11:11 am - 8:51 pmSGF Springfield-Branson-ONT Ontario

11h 40m2 stops Chicago O'Hare Intl Denver Intl

5:00 am - 12:52 pmONT Ontario-SGF Springfield-Branson

5h 52m1 stop Denver Intl

$479United Airlines

Wed, Nov 18 - Tue, Nov 24

2:55 pm - 9:40 pmSGF Springfield-Branson-ONT Ontario

8h 45m1 stop Houston George Bush Intcntl

5:00 am - 12:41 pmONT Ontario-SGF Springfield-Branson

5h 41m1 stop Denver Intl

$484United Airlines

Sat, Nov 14 - Wed, Nov 18

12:21 pm - 7:49 pmSGF Springfield-Branson-ONT Ontario

9h 28m1 stop Atlanta Hartsfield-Jackson

7:05 am - 4:33 pmONT Ontario-SGF Springfield-Branson

7h 28m1 stop Atlanta Hartsfield-Jackson

$534Delta

Sat, Nov 14 - Tue, Nov 17

12:21 pm - 7:49 pmSGF Springfield-Branson-ONT Ontario

9h 28m1 stop Atlanta Hartsfield-Jackson

7:05 am - 4:33 pmONT Ontario-SGF Springfield-Branson

7h 28m1 stop Atlanta Hartsfield-Jackson

$534Delta

Wed, Nov 18 - Sun, Nov 22

9:30 am - 4:19 pmSGF Springfield-Branson-ONT Ontario

8h 49m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl

6:00 am - 1:54 pmONT Ontario-SGF Springfield-Branson

5h 54m1 stop Dallas/Fort Worth

$599American Airlines

Wed, Nov 18 - Mon, Nov 23

6:44 pm - 11:46 pmSGF Springfield-Branson-ONT Ontario

7h 02m1 stop Dallas/Fort Worth

1:30 pm - 10:07 pmONT Ontario-SGF Springfield-Branson

6h 37m2 stops Phoenix Sky Harbor Intl Dallas/Fort Worth

$599American Airlines

Useful Info

Low season	January
High season	December
Cheapest flight	$84

Best time to beat the crowds with an average 9% drop in price.

Most popular time to fly with an average 1% increase in price.

Flight from St. Louis to Ontario

How does KAYAK find such low prices on flights from Missouri to Ontario?
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 Missouri to Ontario.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Missouri to Ontario?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Missouri 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 Missouri to Ontario?
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 Ontario with an airline and back to Missouri with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Missouri to Ontario?
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 Ontario from Missouri up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.