Cheap flights from St. Louis to Ottawa from $217
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 Ottawa departing on 7/24. 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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United Airlines flights from St. Louis to Ottawa
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Air Canada flights from St. Louis to Ottawa
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How to get the cheapest flight ticket from St. Louis to Ottawa
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 day to depart on your flight to Ottawa?
The cheapest day to depart from St. Louis to Ottawa is on a Saturday. Travelers who choose to depart for Ottawa on a Saturday will often find tickets for as low as $407. Be sure to avoid booking your departure on a Monday as prices are generally higher than usual. According to our data, the average ticket price to Ottawa on Monday is $860.
What is the cheapest time of day to depart on your flight to Ottawa?
In the afternoon is the cheapest time of day to fly from St. Louis to Ottawa when you can find flight prices for as low as $615. Flying to Ottawa in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $682 on average. Flights to Ottawa from St. Louis in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.
When to book flights from St. Louis to Ottawa
Cheap St. Louis to Ottawa (STL to YOW) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from St. Louis to Ottawa
How far is Lambert-St Louis to Ottawa by plane?
There are 877.2 mi between Lambert-St Louis and Ottawa. By plane, this route typically takes 4h 35m.
When did momondo last update prices for flights from Lambert-St Louis Airport to Ottawa Airport?
Prices for flights from Lambert-St Louis Airport to Ottawa Airport are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Ottawa Airport?
As of July 2025, there are 2 operators available to choose from for flights from Lambert-St Louis Airport to Ottawa Airport.
How old do you have to be to fly from Lambert-St Louis Airport to Ottawa Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Ottawa Airport.
What documentation or ID do you need to fly to Ottawa Airport?
The required travel and health documents for your Ottawa 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 Ottawa Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular airline from St. Louis to Ottawa?
momondo data reveals that the most frequently booked airline on the route from St. Louis to Ottawa is United Airlines, representing 51% of all bookings. The subsequent popular airline is Air Canada at 49%.
Best airlines flying from St. Louis to Ottawa
Compare and see reviews for airlines that fly from St. Louis to Ottawa with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $330 | Free Cancellation | Rating 7.1 9,681 reviews | |||
| PriceFrom $434 | Free Cancellation | Rating 7.4 8,861 reviews |
Traveling to a place near Ottawa?
Book flights to Ottawa if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from St. Louis to Ottawa?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from St. Louis to Ottawa. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from St. Louis to Ottawa with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to Ottawa from St. Louis with this policy.
How can momondo help me find flights from St. Louis to Ottawa?
momondo provides multiple filters to help you find the best flight to Ottawa from St. Louis. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.
I’m not ready to book a flight from St. Louis to Ottawa right now. Can momondo alert me if prices change?
Yes momondo offers price alerts on flights to Ottawa from St. Louis. 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.