Cheap flights from Ottawa to St. Louis from $215
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 5/18. 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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How to get the cheapest flight ticket from Ottawa to St. Louis
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What is the cheapest month to fly to St. Louis?
In general, September is the cheapest month to fly from Ottawa to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $569. The month of March is another great option to travel to St. Louis, with average flight prices from Ottawa averaging around $608.
What is the cheapest day to depart on your flight to St. Louis?
The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $614. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $667. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.
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?
The straight-line distance from Ottawa to Lambert-St Louis is 877.2 mi. By plane, this route typically takes 5h 19m.
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?
As of April 2025, there is 1 operator available to choose from for flights from Ottawa Airport to Lambert-St Louis Airport.
How old do you have to be to fly from Ottawa Airport to Lambert-St Louis Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for 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 flights between Ottawa and St. Louis, the leading airline is Air Canada, making up 100% of the 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 $637 | Free Cancellation | Rating 7.0 9,244 reviews |
Traveling 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?
Finding the right flight to St. Louis from Ottawa 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 St. Louis quick and easy, saving you time and money.
Can I find flights from Ottawa to St. Louis with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to St. Louis from Ottawa with this policy.
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?
If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Ottawa and alert you when they change.