A city skyline with a prominent arch bridge at sunset.

CA $535 Cheap Flights from Saint John (YSJ) to St. Louis (STL)

View CA $535 flight on Fri, Oct 9, 2026Opens in a new window

Popular airlines from Saint John, NB (YSJ) to Lambert-St. Louis International Airport (STL)

  • Be in the know

    Get alerts if flight prices drop or rise*

  • Book smarter

    Save up to 30% on select hotels after you book a flight*

  • Earn twice

    Earn your airline miles on top of our rewards
    Sign in

Cheap flights from Saint John (YSJ) to St. Louis (STL)

Prices were available within the past 7 days and start at CA $535 for one-way flights and CA $1,052 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Thu, Oct 22 - Sun, Oct 25
YSJ
Saint John
STL
St. Louis
CA $1,052 Roundtrip, found 2 days ago
CA $1,052
Roundtrip
found 2 days ago
Select Air Canada flight, departing Thu, Oct 22 from Saint John to St. Louis, returning Sun, Oct 25, priced at CA $1,052 found 2 days ago
Air Canada
Mon, Oct 12 - Sat, Oct 17
YSJ
Saint John
STL
St. Louis
CA $1,053 Roundtrip, found 4 days ago
CA $1,053
Roundtrip
found 4 days ago
Select Air Canada flight, departing Mon, Oct 12 from Saint John to St. Louis, returning Sat, Oct 17, priced at CA $1,053 found 4 days ago
Air Canada
Thu, Oct 22 - Sat, Oct 24
YSJ
Saint John
STL
St. Louis
CA $1,087 Roundtrip, found 2 days ago
CA $1,087
Roundtrip
found 2 days ago
Select Air Canada flight, departing Thu, Oct 22 from Saint John to St. Louis, returning Sat, Oct 24, priced at CA $1,087 found 2 days ago
Air Canada
Mon, Oct 19 - Mon, Oct 26
YSJ
Saint John
STL
St. Louis
CA $1,089 Roundtrip, found 2 days ago
CA $1,089
Roundtrip
found 2 days ago
Select Air Canada flight, departing Mon, Oct 19 from Saint John to St. Louis, returning Mon, Oct 26, priced at CA $1,089 found 2 days ago
Air Canada
Wed, Oct 14 - Thu, Oct 22
YSJ
Saint John
STL
St. Louis
CA $1,103 Roundtrip, found 4 days ago
CA $1,103
Roundtrip
found 4 days ago
Select Air Canada flight, departing Wed, Oct 14 from Saint John to St. Louis, returning Thu, Oct 22, priced at CA $1,103 found 4 days ago
Air Canada
Fri, Oct 23 - Sat, Oct 24
YSJ
Saint John
STL
St. Louis
CA $1,123 Roundtrip, found 2 days ago
CA $1,123
Roundtrip
found 2 days ago
Select Air Canada flight, departing Fri, Oct 23 from Saint John to St. Louis, returning Sat, Oct 24, priced at CA $1,123 found 2 days ago
United
Wed, Oct 14 - Fri, Oct 16
YSJ
Saint John
STL
St. Louis
CA $1,124 Roundtrip, found 4 days ago
CA $1,124
Roundtrip
found 4 days ago
Select United flight, departing Wed, Oct 14 from Saint John to St. Louis, returning Fri, Oct 16, priced at CA $1,124 found 4 days ago
Air Canada
Wed, Oct 21 - Sun, Oct 25
YSJ
Saint John
STL
St. Louis
CA $1,135 Roundtrip, found 2 days ago
CA $1,135
Roundtrip
found 2 days ago
Select Air Canada flight, departing Wed, Oct 21 from Saint John to St. Louis, returning Sun, Oct 25, priced at CA $1,135 found 2 days ago
Air Canada
Thu, Oct 22 - Sun, Oct 25
YSJ
Saint John
STL
St. Louis
CA $1,145 Roundtrip, found 2 days ago
CA $1,145
Roundtrip
found 2 days ago
Select Air Canada flight, departing Thu, Oct 22 from Saint John to St. Louis, returning Sun, Oct 25, priced at CA $1,145 found 2 days ago
United
Thu, Oct 15 - Mon, Oct 19
YSJ
Saint John
STL
St. Louis
CA $1,154 Roundtrip, found 4 days ago
CA $1,154
Roundtrip
found 4 days ago
Select United flight, departing Thu, Oct 15 from Saint John to St. Louis, returning Mon, Oct 19, priced at CA $1,154 found 4 days ago

Frequently asked questions

How much does a flight from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) cost?
You can find cheap one-way flights from CA $535 and cheap return flights from CA $1,052 YSJ to STL with Expedia. One-way flights typically cost between CA$521 and CA$1013. Flight prices vary based on the month and day of the week you want to travel, as well as the airline and how far in advance you book your ticket. Filter your search on Expedia by "Price (lowest to highest)" to see the cheapest fares first, and use the Price Tracking tool to receive alerts when YSJ to STL ticket fares go up or down.
What is the cheapest month to fly from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The cheapest months to fly from YSJ to STL are typically during off-peak season when demand is low. Traveling in off-peak or shoulder months is usually a good way to secure cheap tickets, just remember to avoid flying during holidays if you are able to. Use the calendar view in your search to see which months have low fares on this route.
Which airlines fly direct from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Enter YSJ to STL and your travel dates, then apply the 'Nonstop' filter to see only direct flights.
How do I find cheap flights from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
To find a cheap flight from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.), be flexible with your dates. Traveling outside of peak vacation months and booking a mid-week flight can help you save. Early morning and late night flights are often more affordable, too. Expedia allows you to compare flight times, airlines and routes all in one place to find low fares. You can also set up Price Tracking and receive alerts when fares go up or down.
What is the best time to fly from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The best time to fly is usually mid-week (Tuesday or Wednesday) and during early morning hours as flights tend to be cheaper, less crowded, and generally more on-time. Avoid major holidays and peak vacation seasons for smoother travel. Combining off-peak days and hours often gives the best combination of cost, comfort, and convenience.
How many flights per day from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
There are approximately 3 connecting flights per day from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.). Some common connection points include Pearson Intl. (YYZ) and Pierre Elliott Trudeau Intl. (YUL).
What is the earliest flight from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The earliest flight from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) typically departs around 5:40 AM local time. This flight is operated by Air Canada. This is a seasonal service, active in January. An early departure like this can help you make the most of your time at your destination. To compare early flights on Expedia, select the "Early Morning" and "Morning" filters in your search.
What day of the week has the most flights from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
You'll typically find the most flights from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) on a Saturday, with around 4 flights available. This gives you a good selection for your travel plans. Air Canada is a major airline on this route.
What are the most popular departure times for flights from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
The most popular departure times for flights from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) are typically in the morning, between 9am and 12pm. Air Canada offers flights during this window. Many travellers prefer these times as they allow for an early start to your journey.
How long does it take to fly from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
There are no nonstop flights from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.). For flights with one stop, you can expect the journey to take around 6 hours. Flights with two or more stops typically take longer, averaging about 14 hours 30 minutes. The total distance covered is approximately 2,140 kilometres. Keep in mind that these are average times, and your actual travel duration can vary depending on the specific routing, layover times, and even weather conditions.
Can you fly business or first class from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
Yes, you can fly business class between Saint John, NB (YSJ) and St. Louis, MO (STL). You can fly business class with Air Canada.
How do I earn miles on a Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight with Expedia?
It's easy to earn miles on a Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight when you book with Expedia. Before you confirm your booking, simply select your frequent flyer program and enter your program number. As a member of One Key™, you can also earn OneKeyCash™* on top of your airline miles when you book with Expedia.*Excludes taxes and fees. OneKeyCash is not redeemable for cash and can only be used on Expedia and other participating brands.
What airports do you fly into for St. Louis, MO (STL) from Saint John, NB (YSJ)?
If you're planning to travel to St. Louis from YSJ, you can fly directly into Lambert-St. Louis Intl. (STL). Some flights may connect through major hubs like Pearson Intl. (YYZ), Pierre Elliott Trudeau Intl. (YUL), or Stanfield Intl. (YHZ) before reaching St. Louis. Compare routes and airports on Expedia to find the best flight options for your travel plans.
Is it cheaper to buy a plane ticket from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) at the last minute?
Typically, booking a last minute flight from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) will be more expensive than booking in advance. As the departure date approaches, there are usually fewer seats available which can drive up the cost. However, if there's some wiggle room with your travel dates and times, you could bag a cheap last-minute fare.
Is it cheaper to book a Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package?
Securing a Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight and hotel package is usually cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add flights, activities and car rentals to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.)?
If you booked your Saint John, NB (YSJ) to St. Louis, MO (STL-Lambert-St. Louis Intl.) flight within the last 24 hours, you may be able to modify or cancel it without any fees. Depending on the airline and the type of ticket you have, additional charges may apply for changes beyond this timeframe. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you'd like more information.

Travel information

Origin airport
Saint John
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
CA $1,051
Distance
2127 km

Book with confidence

Saint John to St. Louis Flights

The easy way to book your flights from Saint John to St. Louis 

With Expedia, it’s simple to find and book flights to St. Louis from Saint John whether you’re traveling for business or pleasure. Enter your travel dates, hit search, and choose your flight from 20 airlines that cover this route. There are nonstop flights to Lambert-St. Louis Intl., too.  

Choose your preferred carrier and cabin class with the advanced search tool and select your ideal departure time. Then, if you want, you can see just nonstop or refundable flights. And if you’re traveling last minute, just enter the date to check out flights from Saint John to St. Louis today, tomorrow, or this week.  

 

Save dollars with cheap flights from Saint John, YSJ to Lambert-St. Louis Intl., STL 

Sort your search results by price to find great deals on your flight from Saint John to St. Louis—you get all your cheapest options first. Grab yourself a bargain now—the lowest price on flights to St. Louis from Saint John currently is just CA $1,052 rising to CA $1,154.  

Here are more money-saving tips: 

  • Fly in October when flight prices are normally at their lowest 
  • Book about a month to 6 weeks before you travel for the best prices to St. Louis  
  • Avoid peak season and weekends when flights can cost more
  • Early morning and late-night flights are sometimes cheaper, so try varying your travel times 
  • One surefire way to save money on your flight is to book your flight and hotel together with Expedia. Sometimes, the savings are so large that the flight is basically free! 

 

Reasons to choose Expedia for your flight to St. Louis from Saint John 

Whatever your destination, budget, or reason to travel, in just one quick search, you can choose from loads of flights, airlines, and cabin classes. The filters make it quick and easy to find your ideal flights, and if you choose one of the flexible options, you won’t be charged to change your flight. So book your flight to St. Louis with Expedia today.

Saint John to St. Louis Flights

Explore a world of travel with Expedia

*Available to Expedia members.