Cheap flights from St. Louis to Ottawa from $186

Travelers frequently search for route combinations, such as St. Louis and Las Vegas, Cancún, Orlando, Los Angeles, San Francisco, Denver, Mexico City, Tuxtla Gutiérrez, Toronto, Lima, Buenos Aires, Cali, Sydney, Warsaw, San José, Washington, D.C., Reykjavik, Fort Lauderdale, Melbourne, Ontario.

Travelers frequently search for route combinations, such as Ottawa and New York, Atlanta, Fort Lauderdale, Dallas, Orlando, Boston, Minneapolis, Tampa, New Orleans, Chicago, San Francisco, Los Angeles, Houston, Memphis, Washington, D.C., Seattle, Las Vegas, Austin, San Diego, Charlotte.

The main airport in St. Louis is St. Louis Lambert International. It is also served by St. Louis Lambert International, MidAmerica St. Louis, Evansville Regional, General Wayne A. Downing Peoria International, Central Illinois Regional, Columbia Regional, Abraham Lincoln Capital, Cape Girardeau Regional, Williamson County Regional, Waynesville-St. Robert Regional.

The main airport in Ottawa is Ottawa Macdonald–Cartier International. It is also served by Montréal–Pierre Elliott Trudeau International, Syracuse Hancock International, Montreal Saint-Hubert Longueuil, Ogdensburg International, Plattsburgh International, Massena International, Adirondack Regional, Watertown International.

Currently, you can fly between St. Louis and Ottawa with Porter Airlines, WestJet, Frontier Airlines, United Airlines, Air Canada.

If you don’t have specific dates for your trip between St. Louis and Ottawa, you can enter a date range into the departure and return fields. Most carriers on the Kiwi.com website allow you to search and book up to six months from the day of your search. Order the search results by the best, cheapest, or fastest route, or find the cheapest outbound and return combination in the pricing table.

Traveling between St. Louis and Ottawa, you can choose between direct (nonstop) flights or flights with one or more stops. You can select the number of stops on your journey, including an overnight stopover, and the duration of the stopover. What’s more, you can also select where you want to have your stopover. Want to say "Hi" to a friend in another city en route to your destination? Or fancy a quick round of shopping? Go Multi-City or Nomad and add places to your search that you wish to visit.

There are a number of airports in and around St. Louis. The main one is St. Louis Lambert International and other nearby airports include St. Louis Lambert International, MidAmerica St. Louis, Evansville Regional, General Wayne A. Downing Peoria International, Central Illinois Regional, Columbia Regional, Abraham Lincoln Capital, Cape Girardeau Regional, Williamson County Regional, Waynesville-St. Robert Regional

There are a number of airports in and around Ottawa. The main one is Ottawa Macdonald–Cartier International and other nearby airports include Montréal–Pierre Elliott Trudeau International, Syracuse Hancock International, Montreal Saint-Hubert Longueuil, Ogdensburg International, Plattsburgh International, Massena International, Adirondack Regional, Watertown International.