$233 Find Cheap Flights from St. Louis to Ottawa - Compare and Save

Only Economy Class is available on flights from St. Louis to Ottawa.

There are currently no nonstop flights available from St. Louis to Ottawa. Flights with 1 layover take between 5h 26m and 5h 48m in total, depending on the connection.

Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

Round-trip flights from St. Louis to Ottawa range from $435 to $706, with an average of $489 over the past 12 months. Anything below $435 counts as a good deal.

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $510 to $1,646. That means the highest observed fare was about 3x higher than the lowest one.

One-way fares from St. Louis to Ottawa are currently higher than usual. Average one-way flight prices are about $354, which is 63% above the typical average for this route.

Ottawa Airport (YOW) hosts 5 major car rental companies, with daily rates averaging $42 for economy cars. Top options include:

• Routes Car & Truck Rentals
• Europcar
• Alamo
• Budget
• Enterprise Rent-A-Car

Flights from St. Louis to Ottawa usually depart from Lambert-St Louis (STL) and arrive at Ottawa (YOW).

One-stop flights from St. Louis to Ottawa most commonly connect through:

• Toronto Pearson Intl (YYZ) - 59% of one-stop connections
• Chicago O'Hare Intl (ORD) - 28% of one-stop connections
• Montreal Pierre Elliott Trudeau Intl (YUL) - 13% of one-stop connections

Yes. Flexible dates can save you up to 60% on flights from St. Louis to Ottawa. Wednesday is the cheapest departure day at $358 round-trip on average, while Sunday is the most expensive at $879, a difference of $521.

KAYAK's flexible dates feature shows options up to 3 days before and after your selected dates, making it easier to compare nearby fares.

Flying via Montreal Pierre Elliott Trudeau Intl (YUL) gives the shortest average 1-stop total travel time at 5h 26m, compared with 5h 31m via Toronto Pearson Intl (YYZ) and 5h 48m via Chicago O'Hare Intl (ORD).

Ottawa is 1 hour ahead of St. Louis (Eastern Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

Some of the most popular sights in Ottawa are Garden of the Provinces and Territories, Nepean Sportsplex and Major's Hill Park. These are among the most viewed places in Ottawa on KAYAK.