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Cheap flights from Calgary to St. Louis from C$ 249

YYC — STL
23 Sep — 30 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Calgary to St. Louis

Enter your travel dates to find the best prices.

Cheapest flights from Calgary to St. Louis

Mon 12/107:00 a.m. -
1 stop9h 40m
Wed 21/106:35 p.m. -
1 stop17h 25m
Deal found 19/8C$ 515
Tue 8/99:00 p.m. -
2 stops15h 10m
Thu 10/912:17 p.m. -
1 stop9h 03m
Deal found 20/8C$ 516
Fri 25/912:20 a.m. -
1 stop11h 12m
Tue 29/96:40 a.m. -
1 stop14h 35m
Deal found 19/8C$ 541
Wed 16/912:20 a.m. -
1 stop9h 35m
Sun 20/96:40 a.m. -
1 stop14h 35m
Deal found 19/8C$ 544
Sun 6/912:20 a.m. -
1 stop8h 00m
Wed 9/92:29 p.m. -
2 stops25h 46m
Deal found 20/8C$ 562
Tue 8/96:35 a.m. -
1 stop26h 48m
Thu 10/97:05 a.m. -
1 stop28h 55m
Deal found 20/8C$ 570

Find flight deals from Calgary to St. Louis

Round-trip from

C$ 515

One-way from

C$ 249

Popular in

June

Cheapest in

May

Average price

C$ 688
12/10-21/10
  • 12/10-21/10
  • 2 total stops
  • 27h 05m total
  • Calgary to St. Louis
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5/10
  • 5/10
  • 1 total stop
  • 9h 32m total
  • Calgary to St. Louis
Search Deals
High demand for flights, 1% potential price rise
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Cheapest flight prices on average. 3% potential price decrease (C$ 33 potential savings vs. average RT price).
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Average for round-trip flights in August 2026
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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from Calgary to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

CalgarySt. Louis

YYC Calgary - STL Lambert-St Louis

YYCSTL

Calgary

Mon 12/10

7:00 a.m.-5:40 p.m.

1 stop9h 40m

Lambert-St Louis

Wed 21/10

6:35 p.m.-11:00 a.m.

1 stop17h 25m

C$ 515

CalgarySt. Louis

YYC Calgary - STL Lambert-St Louis

YYCSTL

Calgary

Tue 8/9

9:00 p.m.-1:10 p.m.

2 stops15h 10m

Lambert-St Louis

Thu 10/9

12:17 p.m.-8:20 p.m.

1 stop9h 03m

C$ 516

CalgarySt. Louis

YYC Calgary - STL Lambert-St Louis

YYCSTL

Calgary

Mon 1/2

8:45 a.m.-10:39 p.m.

1 stop13h 54m

Lambert-St Louis

Sat 13/2

3:40 p.m.-1:05 p.m.

1 stop21h 25m

C$ 542

CalgarySt. Louis

YYC Calgary - STL Lambert-St Louis

YYCSTL

Calgary

Fri 25/9

12:20 a.m.-9:34 a.m.

1 stop8h 14m

Lambert-St Louis

Tue 29/9

6:15 a.m.-5:00 p.m.

2 stops11h 45m

C$ 552

CalgarySt. Louis

YYC Calgary - STL Lambert-St Louis

YYCSTL

Calgary

Sun 6/9

12:20 a.m.-9:20 a.m.

1 stop8h 00m

Lambert-St Louis

Wed 9/9

2:29 p.m.-5:10 p.m.

1 stop27h 41m

C$ 566

CalgarySt. Louis

YYC Calgary - STL Lambert-St Louis

YYCSTL

Calgary

Tue 8/9

6:35 a.m.-10:23 a.m.

1 stop26h 48m

Lambert-St Louis

Thu 10/9

7:05 a.m.-11:00 a.m.

1 stop28h 55m

C$ 570

CalgarySt. Louis

YYC Calgary - STL Lambert-St Louis

YYCSTL

Calgary

Mon 12/10

6:50 p.m.-9:09 a.m.

2 stops13h 19m

Lambert-St Louis

Wed 21/10

10:31 a.m.-8:15 p.m.

1 stop10h 44m

C$ 573

CalgarySt. Louis

YYC Calgary - STL Lambert-St Louis

YYCSTL

Calgary

Sat 3/10

7:00 a.m.-4:47 p.m.

2 stops8h 47m

Lambert-St Louis

Sat 10/10

10:31 a.m.-8:15 p.m.

1 stop10h 44m

C$ 600
Quickest round-trip

CalgarySt. Louis

YYC Calgary - STL Lambert-St Louis

YYCSTL

Calgary

Tue 20/10

6:35 a.m.-1:32 p.m.

1 stop5h 57m

Lambert-St Louis

Wed 21/10

2:22 p.m.-11:10 p.m.

1 stop9h 48m

C$ 602
Cheapest one-way

CalgarySt. Louis

YYC Calgary - STL Lambert-St Louis

YYCSTL

Calgary

Tue 15/9

9:00 p.m.-1:10 p.m.

2 stops15h 10m

C$ 251

Flights are sorted by cheapest round-trip flights first.

Deals found on 19/8

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

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

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Calgary with our price prediction graph.
Estimated round-trip price

Cheapflights Insights

Everything you need to know about your flight from Calgary to St. Louis

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

Currently, May is the cheapest month in which you can book a flight from Calgary to St. Louis (average of C$ 441). Flying from Calgary to St. Louis in June is currently the most expensive (average of C$ 956). 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.

How much does it cost to fly round-trip from Calgary to St. Louis?

Airfare is below average for this route at the moment.

Calgary to St. Louis flights typically cost between C$ 610 and C$ 715 in October.
The cheapest round-trip price found within the last 5 days was C$ 515 on Multiple Airlines (12 Oct-21 Oct).

Reviews of airlines servicing St. Louis

Read reviews from past customers who have flown Delta and WestJet from Calgary to St. Louis. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.8
Good
8,524 reviews
Check prices

Food

7.2

Overall

7.8

Comfort

7.8

Entertainment

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Salvador,Aug 2026

PHL - DTW

No food and entertainment. Also de aircraft is old and noisy.
Delta
7.8
Good
8,524 reviews
Delta
7.8
Good
8,524 reviews
Check prices

Food

7.2

Overall

7.8

Comfort

7.8

Entertainment

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Salvador,Aug 2026

PHL - DTW

No food and entertainment. Also de aircraft is old and noisy.
WestJet
7.2
Good
3,438 reviews
Delta
7.8
Good
8,524 reviews
Check prices

Food

7.2

Overall

7.8

Comfort

7.8

Entertainment

7.8

Boarding

8.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Salvador,Aug 2026

PHL - DTW

No food and entertainment. Also de aircraft is old and noisy.

Related info for your journey

  • How long is the flight from Calgary to St. Louis?

    WestJet can get you from Calgary to St. Louis in just under 13h 54m. Your travel time can differ by up to . Airlines will cover a distance of 2297 km.

  • What are the cheapest airlines flying from Calgary to St. Louis round-trip?

    Flying on Delta is currently your cheapest option to St. Louis, with prices starting at C$ 344. Another option worth looking into is WestJet, starting at C$ 563 round trip. Delta is priced at 51% lower than the current average price of a flight leaving 3 months from now.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Calgary 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 Calgary to St. Louis?

    Currently, May is the cheapest month in which you can book a flight from Calgary to St. Louis (average of C$ 441). Flying from Calgary to St. Louis in June is currently the most expensive (average of C$ 956). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
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Alternative routes for Calgary to St. Louis

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Top 2 airlines flying from Calgary to St. Louis

AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 344AverageC$ 541FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 563AverageC$ 687FlexibilityNo cancel feeOn-time60%
Search WestJet flights

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Need flexible booking options for your flight to St. Louis from Calgary? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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