Cheap flights from St. Louis to Ontario from $44
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Ontario departing on 5/15. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Deals available from 900+ travel sites.
Big names and deals
Big names and deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Stopover? Instantly customize your results.Trusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? Create a price alert to track prices.Easily compare round-trip flights from St. Louis to Ontario
Below you can see the best fares for your round-trip flight route over the next six months. All fares were found on momondo this week. Browse the quickest and cheapest flights from St. Louis to Ontario by changing tabs
Find the cheapest one-way flights from St. Louis to Ontario
If you're looking for one-way flights from St. Louis to Ontario, view some of our deals below provided by Frontier
Search last-minute flights to Ontario from St. Louis
Find and compare round-trip flight prices for your last-minute flight from St. Louis to Ontario
Best airlines flying from St. Louis to Ontario
Compare and see reviews for airlines that fly from St. Louis to Ontario with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $125 | Free Cancellation | Rating 6.3 4,163 reviews | |||
| PriceFrom $286 | Free Cancellation | Rating 8.0 11,094 reviews | |||
| PriceFrom $309 | Free Cancellation | Rating 7.3 14,955 reviews | |||
| PriceFrom $337 | Free Cancellation | Rating 7.4 11,325 reviews |
Frontier flights from St. Louis to Ontario
Our best Frontier deals on St. Louis to Ontario flight tickets
American Airlines flights from St. Louis to Ontario
Our best American Airlines deals on St. Louis to Ontario flight tickets
How to get the cheapest flight ticket from St. Louis to Ontario
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 from St. Louis to Ontario?
August. The cheapest time of year to fly to Ontario from St. Louis is August. Most expensive is June
What is the cheapest day to depart St. Louis for Ontario?
Thursday. The cheapest day of the week is typically Thursday. The most expensive is typically Friday
When is the cheapest time to fly from St. Louis to Ontario?
In the evening. St. Louis to Ontario flights are approximately 55% more expensive at noon than in the evening
What is the cheapest airline that flies to Ontario from St. Louis?
Frontier. American Airlines, Delta, and Frontier are the most popular carriers operating from St. Louis to Ontario
What is the cheapest St. Louis to Ontario flight route?
Lambert-St Louis - Ontario. Fly from Lambert-St Louis to Ontario for the best St. Louis - Ontario flight prices
How far in advance should you book St. Louis to Ontario flights?
37 days before. The cheapest time to buy a flight from St. Louis to Ontario is approximately 37 days to departure
Can stopping save me money on St. Louis to Ontario flights?
You could potentially save up to 88% on your flight if you consider stops on a St. Louis to Ontario flight.
Cheap St. Louis to Ontario (STL to ONT) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Ontario
Best Price Found | $44 |
|---|---|
Fastest flight time | 5h 39m |
Direct flights | Sun |
Airports in Ontario | 1 airport |
How far is Lambert-St Louis to Ontario by plane?
A flight from Lambert-St Louis to Ontario will travel around 1552.8 mi. 5h 39m is a normal flight duration for this route.
When did momondo last update prices for flights from Lambert-St Louis Airport to Ontario Airport?
Prices for flights from Lambert-St Louis Airport to Ontario Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Lambert-St Louis Airport to Ontario Airport?
The number of operators available for flights from Lambert-St Louis Airport to Ontario Airport is 4 as of April 2024.
How old do you have to be to fly from Lambert-St Louis Airport to Ontario Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Ontario Airport.
What documentation or ID do you need to fly to Ontario Airport?
The required travel and health documents for your Ontario 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 Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
Why use momondo?
Why should I use momondo to find a flight deal from St. Louis to Ontario?
Finding the right flight to Ontario from St. Louis is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Ontario quick and easy, saving you time and money.
Can I find flights from St. Louis to Ontario with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to Ontario from St. Louis with this policy.
How can momondo help me find flights from St. Louis to Ontario?
momondo helps you find the best flight between St. Louis and Ontario by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.
I’m not ready to book a flight from St. Louis to Ontario right now. Can momondo alert me if prices change?
If you are simply researching potential flights to Ontario, momondo offers a useful price alert feature which will track prices for flights to Ontario from St. Louis and alert you when they change.