Cheap Flights from Ottawa International to St Louis

Compare Ottawa International to St Louis flight deals

Find the cheapest month or even day of the year to fly to St Louis

Book the best St Louis fare with no extra fees

Flight deals from Ottawa International to St Louis

Looking for a cheap last-minute deal or the best return flight from Ottawa International to St Louis? Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Ottawa International to St Louis

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Ottawa International to St Louis flights are currently cheapest in December.

Ottawa International to St Louis: Alternative routes

Compare routes from Ottawa International to St Louis below. You may find an airport to fly into that's cheaper, faster, or easier than St Louis.

Ottawa to St Louis: Flight information

The things to know before you go.
Cheapest flight found$956
Cheapest month to flyNovember

Finding cheap flights from Ottawa International to St Louis: Frequently asked questions

The best price we found for a return flight from Ottawa International to St Louis is $956. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Ottawa International to St Louis. But we found flights with one or more stops from $962.
As of October 2024, there are no flights flying from Ottawa International to St Louis.
The cheapest month to fly from Ottawa International to St Louis is usually October 2024.
After crunching the numbers on our flight calendar, we found that it's currently cheapest to fly from Ottawa International Airport to St Louis Airport on Sunday, 24 November 2024.
No airlines currently offer direct flights between Ottawa International Airport and St Louis Airport. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to St Louis but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to St Louis is around 40 days in advance, so don’t leave your flight to the last minute.
Currently, United offers the cheapest flight tickets to St Louis.

Flying from Ottawa/Macdonald-Cartier International Airport (YOW) to Lambert-St. Louis International Airport (STL): what you need to know

  • If you're going away during a peak month like August, get to the terminal even earlier. It's wise to arrive up to four hours before an international flight and two hours ahead of a domestic departure. Check-in and security lines will be longer during peak periods like Thanksgiving, Christmas and New Year.

  • Before reserving your cheap ticket from YOW to STL, check if you need a visa to enter United States. Travel document and visa requirements can vary and are updated often. For the latest information, get in touch with the nearest embassy or consulate of the country you're going to.

How to find the cheapest flights from Ottawa/Macdonald-Cartier International Airport (YOW) to Lambert-St. Louis International Airport (STL)

  • The lowest price we've found for a one-way ticket from Ottawa/Macdonald-Cartier International Airport to Lambert-St. Louis International Airport is $510. For a return flight on this route, the best price is $962. Depending on the availability and when you book, these fares may change.

  • It's usually best to book in advance if you're looking for flight tickets from YOW to STL. That's because airlines change prices based on demand, which tends to increase closer to the date of departure.

  • If you're willing to be flexible with your travel dates, try using the 'Whole month' tool. It'll find the cheapest price across every month when searching for a ticket from Ottawa/Macdonald-Cartier International Airport to Lambert-St. Louis International Airport.

  • Getting a cheap ticket from YOW to STL couldn't be easier with Price Alerts. All you need to do is create one of these automatic alerts and we'll let you know when the price has dropped.

  • Play around with filters to find the perfect journey for you. To see the 'Best,' 'Fastest' or 'Cheapest' flights from Ottawa/Macdonald-Cartier International Airport to Lambert-St. Louis International Airport, use the 'Sort by' function. You can also filter results by airline, arrival and departure times, and number of stops.

Handy information about Ottawa/Macdonald-Cartier International Airport (YOW)

  • Located around 13 kilometres from central Ottawa, Ottawa/Macdonald-Cartier International Airport can be reached in approximately 19 minutes by car, depending on traffic. The same journey by public transport will take roughly 43 minutes.

  • Want a stress-free start to your trip? Stay near YOW. Whether you've booked an early flight from Ottawa/Macdonald-Cartier International Airport to Lambert-St. Louis International Airport or want to avoid feeling rushed, these stays are just the thing:

Arriving at Lambert-St. Louis International Airport (STL)

Getting from Lambert-St. Louis International Airport (STL) to central St Louis

  • From Lambert-St. Louis International Airport, St Louis is approximately 26 kilometres away. It takes around 21 minutes to get to the centre driving.

  • It takes roughly 36 minutes if you're travelling on public transport.

When to fly to Lambert-St. Louis International Airport (STL)

  • July is the busiest month for flights from Ottawa/Macdonald-Cartier International Airport to Lambert-St. Louis International Airport. To escape the crowds, travel to St Louis in April.

  • Book your flight from Ottawa/Macdonald-Cartier International Airport to Lambert-St. Louis International Airport for July if you'd like to explore St Louis during its warmest month. You can expect temperatures of between 17 ºC and 33 ºC.

  • January has average temperatures of between -8 ºC and 7 ºC. Look for flight tickets from YOW to STL sometime then if you like travelling in cooler conditions.

More about St Louis

  • Start your St Louis trip right by finding the perfect place to stay. After booking your flight from YOW to STL, explore our hotel options including:

  • There are so many things to see and do in this city it can be tricky to know where to begin. The Gateway Arch, Forest Park and St. Louis Zoo are popular attractions which should be on any good St Louis itinerary.

Complete your St Louis trip with hotels and a car rental

  • You've booked your cheap ticket to Lambert-St. Louis International Airport — now it's time to find a place to stay, and perhaps even a set of wheels. We've compared prices across hundreds of companies to bring you the best hotels and car rental deals in St Louis.

Prices shown on this page are estimated lowest prices only. Found in the last 45 days.