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Cheap flights from Ottawa to St. Louis from C$ 354

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 28/2. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — STL
22 Jan — 29 Jan1
1 adult

Cheap flight deals from Ottawa to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Ottawa (YOW) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 17 January 2025.

Round-trip from

C$ 927

One-way from

C$ 354

Popular in

March

Cheapest in

September

Average price

C$ 953
United Airlines
  • United Airlines
  • 8/2-15/2
  • 3 total stops
  • 15h 45m total
  • Ottawa to St. Louis
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28/2
  • 28/2
  • 2 total stops
  • 18h 48m total
  • Ottawa to St. Louis
Search Deals
High demand for flights, 8% potential price rise
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Best time to find cheap flights, 2% potential price drop
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Average for round-trip flights in January 2025
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Find flight deals from Ottawa to St. Louis

Cheapest flights from Ottawa to St. Louis
Explore the most affordable flight options available from Ottawa to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 January 2025.

Fri 24/14:20 p.m.YOW - STL
1 stop8h 11mMultiple Airlines
Sun 26/18:22 a.m.STL - YOW
1 stop10h 55mMultiple Airlines
Deal found 16/1C$ 481
Sat 8/22:05 p.m.YOW - STL
1 stop6h 04mUnited Airlines
Sat 15/211:20 a.m.STL - YOW
2 stops9h 41mUnited Airlines
Deal found 15/1C$ 927
Fri 24/15:55 a.m.YOW - STL
2 stops15h 07mDelta
Sun 26/112:00 p.m.STL - YOW
2 stops11h 10mDelta
Deal found 16/1C$ 1,271
Fri 17/18:10 p.m.YOW - STL
2 stops16h 37mWestJet
Sun 19/110:20 a.m.STL - YOW
2 stops12h 50mWestJet
Deal found 15/1C$ 1,500
Fri 17/16:20 a.m.YOW - STL
1 stop10h 18mAir Canada
Sun 19/19:44 a.m.STL - YOW
2 stops11h 17mAir Canada
Deal found 15/1C$ 1,516

Find flights from Ottawa to St. Louis within your budget

Customize your flight search to find flights from Ottawa to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 17 January 2025.

Fly from

Any airport

Fly to

Any airport

Route

Depart

Return

Price

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 8/2

2:05 p.m.-7:09 p.m.

1 stop6h 04m

Lambert-St Louis

Sat 15/2

11:20 a.m.-10:01 p.m.

2 stops9h 41m

C$ 927

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Sat 8/2

4:00 p.m.-2:43 p.m.

3 stops23h 43m

Lambert-St Louis

Fri 14/2

1:35 p.m.-2:50 p.m.

3 stops24h 15m

C$ 963

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 28/2

5:55 a.m.-11:43 p.m.

2 stops18h 48m

C$ 354

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Fri 28/2

6:20 a.m.-3:40 p.m.

1 stop10h 20m

C$ 481

Flights are sorted by cheapest round-trip flights first.

Deals found on 16/1

Best time to book a flight from Ottawa to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Ottawa with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Travel insights for flights from Ottawa to St. Louis

Get recent, data-driven insights about flights from Ottawa to St. Louis including ideal travel times, pricing trends, and more.

What is the cheapest month to book a flight from Ottawa to St. Louis?

Currently, January is the cheapest month in which you can book a flight from Ottawa to St. Louis (average of C$ 365). Flying from Ottawa to St. Louis in September is currently the most expensive (average of C$ 491). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Rainfall in St. Louis by month

Plan your trip to St. Louis by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Louis ranges from 56.0 - 119.0 mm per month. May is typically the wettest month, when rainfall can reach 119.0 mm. February is typically the driest time to visit St. Louis when rainfall is around 56.0 mm.

Temperature in St. Louis by month

Plan your trip to St. Louis by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Louis, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to St. Louis. Reviews last updated 17 January 2025.
United Airlines
7.4
Good
8,964 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.7

Reviews

1 / 10

It was a good experience. The flight took 45 minutes longer to fly and all passengers had to wait inside the plane till the technical issue was fixed. Overall it was a good experience.

United Airlines
7.4
Good
8,964 reviews
United Airlines
7.4
Good
8,964 reviews
Check prices

Entertainment

7.1

Comfort

7.3

Overall

7.4

Boarding

7.7

Crew

8.1

Food

6.7

Reviews

1 / 10

It was a good experience. The flight took 45 minutes longer to fly and all passengers had to wait inside the plane till the technical issue was fixed. Overall it was a good experience.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What is the cheapest airline to fly from Ottawa to St. Louis round-trip?

    United Airlines, at C$ 927, was found to be the cheapest airline from Ottawa to St. Louis.. United Airlines is currently priced 5% below the average price you’ll pay for this route.

  • Can I find deals for flights from Ottawa to St. Louis that include hotel bookings?

    Yes. In addition to deals on Ottawa to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to St. Louis.

  • Can I find deals for business class flights from Ottawa to St. Louis?

    Yes. Cheapflights offers flight deals from Ottawa to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ottawa to St. Louis?

    Currently, January is the cheapest month in which you can book a flight from Ottawa to St. Louis (average of C$ 365). Flying from Ottawa to St. Louis in September is currently the most expensive (average of C$ 491). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near Ottawa?

Book flights to Ottawa if you plan to visit one of these locations
St. Peters

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Top airline flying from Ottawa to St. Louis

Discover the top airline that operate flights from Ottawa to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 17 January 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 689AverageC$ 913FlexibilityNo cancel feeOn-time67%
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Fly with Cheapflights

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How does Cheapflights help users find flights from Ottawa to St. Louis?

When you search for this flight from Ottawa to St. Louis, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to St. Louis?

Cheapflights helps you find that perfect flight to St. Louis from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ottawa to St. Louis with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Ottawa to St. Louis flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Ottawa to St. Louis become cheaper?

Yes! Start tracking prices for Ottawa to St. Louis flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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