Cheap flights from Ottawa to St. Louis from C$ 373
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ottawa to St. Louis departing on 20/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
Discover deals from 900+ travel sites with momondo.
Save money when you book flights with momondo
Big names, great deals
Big names, great deals
Search 100s of travel sites to compare prices.Filter for what you want
Filter for what you want
Free Wi-Fi? Early arrival? Instantly customize your resultsTrusted and free
Trusted and free
We’re completely free to use - no hidden charges or fees.Price Alerts
Price Alerts
Not ready to book? to track prices.Find the cheapest flights from Ottawa to St. Louis
Cheap round-trip flights
Cheap one-way flights
See travel insights to St. Louis from
How to get the cheapest flight ticket from Ottawa 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 typical price of a round-trip flight between Ottawa and St. Louis?
What is the cheapest month to fly to St. Louis?
The month of September is, on average, the cheapest month to fly to St. Louis from Ottawa, with most prices found around C$ 789. If you don’t want to visit St. Louis in September, then you should wait until March to fly from Ottawa, when ticket prices are also cheap, with an average price of C$ 843.
What is the cheapest day to depart on your flight to St. Louis?
Our data shows that Wednesday is the least expensive day to fly to St. Louis. Tickets to fly out on this day can be as low as C$ 0. The most expensive day to fly to St. Louis is Thursday, with ticket prices averaging around C$ 1,026.
What is the cheapest airline that flies from Ottawa to Lambert-St Louis?
United Airlines is the most popular carrier operating from Ottawa to Lambert-St Louis
Which airlines fly to St. Louis?
Air Canada, WestJet and United Airlines are the top three most popular airlines that fly to St. Louis from Ottawa according to our data. Air Canada is the first choice among our users, with 72% of people opting to fly with this airline when travelling to St. Louis. Keep in mind that there are 3 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.
When to book flights from Ottawa to St. Louis
Cheap Ottawa to St. Louis (YOW to STL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Ottawa to St. Louis
How far is Ottawa to Lambert-St Louis by plane?
A flight from Ottawa to Lambert-St Louis will travel around 1411.6 km. 6h 33m is a normal flight duration for this route.
When did momondo last update prices for flights from Ottawa Airport to Lambert-St Louis Airport?
Prices for flights from Ottawa Airport to Lambert-St Louis Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Ottawa Airport to Lambert-St Louis Airport?
There is 1 operator available for flights from Ottawa Airport to Lambert-St Louis Airport as of April 2025.
How old do you have to be to fly from Ottawa Airport to Lambert-St Louis 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 Ottawa Airport to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The travel and health documents you'll need for your trip to Lambert-St Louis Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Lambert-St Louis Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Ottawa to St. Louis?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Ottawa to St. Louis is Air Canada (100% of total bookings).
Best airlines flying from Ottawa to St. Louis
Compare and see reviews for airlines that fly from Ottawa to St. Louis with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom C$ 762 | Free Cancellation | Rating 7.0 9,118 reviews |
Travelling to a place near St. Louis?
Book flights to St. Louis if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Ottawa to St. Louis?
We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Ottawa to St. Louis for you.
Can I find flights from Ottawa to St. Louis with flexible booking policies on momondo?
All flight searches from Ottawa to St. Louis on momondo can be filtered to show those which offer flexible booking policies.
How can momondo help me find flights from Ottawa to St. Louis?
momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Ottawa to St. Louis.
I’m not ready to book a flight from Ottawa to St. Louis right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to St. Louis from Ottawa. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.