Beginning of main content
Trip Type
Flight 1
Flight 2
Flight 3
Flight 4
Flight 5

Search over 321,000 hotels worldwide and 400 airlines worldwide.

Secure incredible value with Expedia's Price Guarantee.

No Expedia cancellation fee to change or cancel almost any hotel reservation.

Cheap ONT to STL Flights

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Orange County

$245.44

Long Beach

$336.70

Los Angeles

$267.60

Burbank

$314.07

Cheap ONT to STL Flights

Question : Which airline is offering the cheapest flight from ONT to STL?
Answer : United Airlines is the leader in keeping prices down for their passengers over the next three months. Bookings are being made at just $244, which is quite a deal when compared to the high-end bookings of $871.

Question : Do travelers from Ontario typically stay in Saint Louis for very long?
Answer : Passengers from ONT to STL stay eight days on average.

Question : What are the chances this flight will be delayed?
Answer : Passengers on the Ontario to Saint Louis route have been getting to their destination on time an incredible 100% of the time.

Question : Would you be willing to change your travel days if it saved you money?
Answer : For the month of December, the cheapest day to fly is Tuesday. Having flexibility in your travel plans means you can save more, so be sure to plan ahead when possible.

Question : What is the cheapest day to fly in the next four weeks?
Answer : Jan 5th has seen bookings (as of Dec 11th) as cheap as $244. That comes in 52% below the average price for this route. Saving on flight costs means you'll have more cash to spend on your trip.

Question : How much should a trip from Ontario (ONT) to Saint Louis (STL) cost?
Answer : Ranging from $244 to $871, prices for ONT to STL fluctuate less than the majority of routes in the United States. Prices tend to be lower the further out you book.

Question : Is this route your best bet for getting to Saint Louis with minimal delays?
Answer : ONT to STL currently scores 4 out of a possible 5 stars in promptness. This score combines both the number of delayed flights and total delay minutes. With 4 stars, you should feel at ease about getting to Saint Louis on time.

Los Angeles to St. Louis Flights

Sometimes you just need to get out of town or maybe you’re looking for a change of scenery. Regardless of the reason, a flight from Los Angeles to St. Louis will do just the trick! Go on, plan to see all the famous landmarks and eat your weight in the local cuisine. Your trip is beckoning, so answer the call by packing your suitcase and filling your travel itinerary with exploring St. Louis.

Whether you’re flying for business or jet-setting on your personal time, you’ve come to the right place. Here at Expedia.com, we’ll pair you up with ONT to STL flights that won’t make your bank account wince. Ready to temporarily leave behind Los Angeles for new horizons? Browse through our cheap airfare, and filter by flight times and dates until you find just what you had in mind. From flights without layovers to ones that arrive early in the morning, you’ll come across plane tickets that suit your travel preferences. You can even bundle your flight to STL with hotels and car rentals to score even bigger savings.

All set to hit the clouds? Book your travel arrangements with us today and have left-over money to put toward your travel outings and adventures.