Cheap flights from Ontario to St. Louis from $68
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ontario to St. Louis departing on 10/18. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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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 Ontario to St. Louis by changing tabs
Find the cheapest one-way flights from Ontario to St. Louis
If you're looking for one-way flights from Ontario to St. Louis, view some of our deals below provided by Delta and Frontier
Search last-minute flights to St. Louis from Ontario
Find and compare round-trip flight prices for your last-minute flight from Ontario to St. Louis
United Airlines flights from Ontario to St. Louis
Our best United Airlines deals on Ontario to St. Louis flight tickets
Frontier flights from Ontario to St. Louis
Our best Frontier deals on Ontario to St. Louis flight tickets
How to get the cheapest flight ticket from Ontario to St. Louis
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 Ontario to St. Louis?
June. The cheapest time of year to fly to St. Louis from Ontario is June. Most expensive is December
What is the cheapest day to depart Ontario for St. Louis?
Saturday. The cheapest day of the week is typically Saturday. The most expensive is typically Sunday
When is the cheapest time to fly from Ontario to St. Louis?
In the evening. Ontario to St. Louis flights are approximately 59% more expensive in the afternoon than in the evening
What is the cheapest airline that flies to St. Louis from Ontario?
Frontier. Frontier, Delta, and American Airlines are the most popular carriers operating from Ontario to St. Louis
What is the cheapest Ontario to St. Louis flight route?
Ontario - Lambert-St Louis. Fly from Ontario to Lambert-St Louis for the best Ontario - St. Louis flight prices
How far in advance should you book Ontario to St. Louis flights?
53 days before. The cheapest time to buy a flight from Ontario to St. Louis is approximately 53 days to departure
How have Ontario to St. Louis flight prices changed over time?
As of July 2024, prices for Ontario to St. Louis flights are approximately 4% cheaper when compared to flights at the same time last year.
Cheap Ontario to St. Louis (ONT to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Ontario to St. Louis
How far is Ontario to Lambert-St Louis by plane?
There are 1552.8 mi between Ontario and Lambert-St Louis. 5h 33m is a normal flight duration for this route.
When did momondo last update prices for flights from Ontario Airport to Lambert-St Louis Airport?
Prices for flights from Ontario Airport to Lambert-St Louis Airport are updated daily.
How many operators does momondo search for flights from Ontario Airport to Lambert-St Louis Airport?
There are 4 operators available for flights from Ontario Airport to Lambert-St Louis Airport as of July 2024.
How old do you have to be to fly from Ontario Airport to Lambert-St Louis Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Ontario Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
Best airlines flying from Ontario to St. Louis
Compare and see reviews for airlines that fly from Ontario to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $102 | Free Cancellation | Rating 6.2 3,835 reviews | |||
| PriceFrom $276 | Free Cancellation | Rating 8.0 9,630 reviews | |||
| PriceFrom $282 | Free Cancellation | Rating 7.3 10,000 reviews | |||
| PriceFrom $288 | Free Cancellation | Rating 7.4 10,000 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from Ontario to St. Louis?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Ontario to St. Louis. momondo saves you time and could save you money on your trip.
Can I find flights from Ontario to St. Louis with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Ontario to St. Louis flights to just show those with flexible booking policies.
How can momondo help me find flights from Ontario to St. Louis?
Once all potential Ontario to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Ontario to St. Louis right now. Can momondo alert me if prices change?
If you are not ready to book a flight from Ontario to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.