Ontario — flights from St. Louis to Ontario

Flight Deals from St. Louis to Ontario from $294

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Good to Know

Cheapest fares and when to fly, by destination city — select a row for the details.

Cheapest RT	Cheapest OW	Good Deal Price	Best Time to Fly	Best Day to Fly	When to Book
$615	$294	$690	Midday	Saturday	5 weeks
Cheapest round-trip found on Priceline in the last 8 days. $283 below the typical $898 round-trip on this route. Lowest one-way found in the last 8 days. The typical one-way fare is $433. A round-trip at or under $690 is a good deal on this route right now. 75% of the fares we found cost more; only a quarter cost less. Saturday departures average $789 on this route, the lowest of any weekday. $62 less than the average weekday, which is $851. Midday departures average $690 on this route, the lowest of any time of day. $179 less than the average departure, which is $869. Fares on this route are lowest when booked about 5 weeks before departure. See all flights to Toronto →
$787	$327	$907	Evening	Saturday	5 weeks
Cheapest round-trip found on Priceline in the last 8 days. $124 below the typical $911 round-trip on this route. Lowest one-way found in the last 8 days. The typical one-way fare is $439. A round-trip at or under $907 is a good deal on this route right now. 75% of the fares we found cost more; only a quarter cost less. Saturday departures average $854 for flights to this destination, the lowest of any weekday. $68 less than the average weekday, which is $922. Evening departures average $838 on this route, the lowest of any time of day. $62 less than the average departure, which is $900. Fares to this destination are lowest when booked about 5 weeks before departure. See all flights to Ottawa →
$1,231	$614	$1,279	Morning	Saturday	5 weeks
Cheapest round-trip found on Priceline in the last 8 days. $107 below the typical $1,338 round-trip on this route. Lowest one-way found in the last 8 days. The typical one-way fare is $653. A round-trip at or under $1,279 is a good deal on this route right now. 75% of the fares we found cost more; only a quarter cost less. Saturday departures average $1,269 for flights to this destination, the lowest of any weekday. $100 less than the average weekday, which is $1,369. Morning departures average $1,364 on this route, the lowest of any time of day. $67 less than the average departure, which is $1,431. Fares to this destination are lowest when booked about 5 weeks before departure. See all flights to Windsor →
$1,274	$620	$1,313	Evening	Saturday	5 weeks
Cheapest round-trip found on Priceline in the last 8 days. $48 below the typical $1,322 round-trip on this route. Lowest one-way found in the last 8 days. The typical one-way fare is $675. A round-trip at or under $1,313 is a good deal on this route right now. 75% of the fares we found cost more; only a quarter cost less. Saturday departures average $1,249 for flights to this destination, the lowest of any weekday. $99 less than the average weekday, which is $1,348. Evening departures average $1,274 on this route, the lowest of any time of day. $490 less than the average departure, which is $1,764. Fares to this destination are lowest when booked about 5 weeks before departure. See all flights to London →
$1,269	$627	$1,287	Midday	Saturday	5 weeks
Cheapest round-trip found on Priceline in the last 8 days. $27 below the typical $1,296 round-trip on this route. Lowest one-way found in the last 8 days. The typical one-way fare is $713. A round-trip at or under $1,287 is a good deal on this route right now. 75% of the fares we found cost more; only a quarter cost less. Saturday departures average $1,209 for flights to this destination, the lowest of any weekday. $96 less than the average weekday, which is $1,305. Midday departures average $1,296 on this route, the lowest of any time of day. $7 less than the average departure, which is $1,303. Fares to this destination are lowest when booked about 5 weeks before departure. See all flights to Thunder Bay →

Methodology: learn how we calculate these figures

The best day to fly and how far ahead to book shown in this table are built from the prices Priceline customers actually paid for flights to this destination over the past 12 months or more.

Where a route has too few bookings to fill a figure, we borrow the shape from a group of routes with similar price behavior and fit it to the fares booked on that route.

Because past fares don’t reflect today’s market, we then adjust the historical prices for current conditions such as inflation and fuel costs, using the round-trip fares found in recent searches.

The cheapest round-trip and one-way fares, the good-deal price and the best time of day to fly come directly from the fares found in recent searches, not from historical bookings.

Best Ontario Hotel + Flight Packages

Round-trip flight from St. Louis

STL to YTO

Monte Carlo Inn Airport Suites

Toronto, 7035 Edwards Blvd

71,552 Reviews3-Star Hotel

6% Package Savings

^$1,051/person

$2,228 $2,102 total

Incl. Flight + Hotel

Round-trip flight from St. Louis

STL to YOW

Hilton Garden Inn Ottawa Airport

Ottawa, 2400 Alert Road

8.31,363 Reviews3-Star Hotel

5% Package Savings

^$1,274/person

$2,674 $2,548 total

Incl. Flight + Hotel

Round-trip flight from St. Louis

STL to YQG

SureStay Plus by Best Western Windsor

Windsor, 2530 Ouellette Ave.

7.51,095 Reviews2.5-Star Hotel

1% Package Savings

^$1,648/person

$3,331 $3,295 total

Incl. Flight + Hotel

Round-trip flight from St. Louis

STL to YXU

Knights Inn London ON

London, 1739 Dundas St E

7.2302 Reviews2-Star Hotel

3% Package Savings

^$1,556/person

$3,210 $3,112 total

Incl. Flight + Hotel

Round-trip flight from St. Louis

STL to YQT

Travelodge by Wyndham Thunder Bay ON

Thunder Bay, 450 Memorial Ave.

4.91,005 Reviews2-Star Hotel

1% Package Savings

^$1,383/person

$2,808 $2,766 total

Incl. Flight + Hotel

Round-trip flight from St. Louis

STL to YTO

Crowne Plaza Toronto Airport By IHG

Toronto, 33 Carlson Court

7.61,963 Reviews4-Star Hotel

2% Package Savings

^$1,102/person

$2,244 $2,204 total

Incl. Flight + Hotel

Holiday Inn Express & Suites Downtown Ottawa East by IHG

Round-trip flight from St. Louis

STL to YOW

Holiday Inn Express & Suites Downtown Ottawa East by IHG

Ottawa, 235 King Edward Avenue

8.12,059 Reviews2.5-Star Hotel

7% Package Savings

^$1,310/person

$2,825 $2,619 total

Incl. Flight + Hotel

Round-trip flight from St. Louis

STL to YQG

Comfort Inn & Suites Ambassador Bridge

Windsor, 2330 Huron Church Road

7.4514 Reviews2.5-Star Hotel

4% Package Savings

^$1,687/person

$3,497 $3,373 total

Incl. Flight + Hotel

Round-trip flight from St. Louis

STL to YXU

London Travel Inn

London, 738, Exeter Rd, London, On, London, On

6.4237 Reviews2.5-Star Hotel

5% Package Savings

^$1,559/person

$3,273 $3,117 total

Incl. Flight + Hotel

Quality Inn & Suites Thunder Bay Downtown

Round-trip flight from St. Louis

STL to YQT

Quality Inn & Suites Thunder Bay Downtown

Thunder Bay, 61 Cumberland Street North

7.8838 Reviews2-Star Hotel

2% Package Savings

^$1,489/person

$3,053 $2,977 total

Incl. Flight + Hotel

Best Ontario Hotel + Flight + Car Packages

Round-trip flight from St. Louis

STL to YXU

Knights Inn London ON

London, 1739 Dundas St E

7.2302 Reviews2-Star Hotel

Rental car included

Pick-up in YXU

3% Package Savings

^$1,692/person

$3,497 $3,383 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to YQT

Travelodge by Wyndham Thunder Bay ON

Thunder Bay, 450 Memorial Ave.

4.91,005 Reviews2-Star Hotel

Rental car included

Pick-up in YQT

3% Package Savings

^$1,546/person

$3,173 $3,091 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to YTO

Crowne Plaza Toronto Airport By IHG

Toronto, 33 Carlson Court

7.61,963 Reviews4-Star Hotel

Rental car included

Pick-up in YTO

2% Package Savings

^$1,125/person

$2,290 $2,250 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to YOW

Holiday Inn Express & Suites Downtown Ottawa East by IHG

Ottawa, 235 King Edward Avenue

8.12,059 Reviews2.5-Star Hotel

Rental car included

Pick-up in YOW

8% Package Savings

^$1,412/person

$3,056 $2,824 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to YQG

Comfort Inn & Suites Ambassador Bridge

Windsor, 2330 Huron Church Road

7.4514 Reviews2.5-Star Hotel

Rental car included

Pick-up in YQG

4% Package Savings

^$1,806/person

$3,779 $3,611 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to YXU

London Travel Inn

London, 738, Exeter Rd, London, On, London, On

6.4237 Reviews2.5-Star Hotel

Rental car included

Pick-up in YXU

5% Package Savings

^$1,694/person

$3,564 $3,388 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to YQT

Quality Inn & Suites Thunder Bay Downtown

Thunder Bay, 61 Cumberland Street North

7.8838 Reviews2-Star Hotel

Rental car included

Pick-up in YQT

3% Package Savings

^$1,652/person

$3,419 $3,303 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to YTO

Monte Carlo Inn Airport Suites

Toronto, 7035 Edwards Blvd

71,552 Reviews3-Star Hotel

Rental car included

Pick-up in YTO

6% Package Savings

^$1,074/person

$2,276 $2,148 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to YOW

Hilton Garden Inn Ottawa Airport

Ottawa, 2400 Alert Road

8.31,363 Reviews3-Star Hotel

Rental car included

Pick-up in YOW

5% Package Savings

^$1,377/person

$2,904 $2,754 total

Incl. Flight + Hotel + Car

Round-trip flight from St. Louis

STL to YQG

SureStay Plus by Best Western Windsor

Windsor, 2530 Ouellette Ave.

7.51,095 Reviews2.5-Star Hotel

Rental car included

Pick-up in YQG

2% Package Savings

^$1,766/person

$3,614 $3,532 total

Incl. Flight + Hotel + Car

What's the cheapest day of the week to fly?

Saturday is the cheapest day of the week to fly from St. Louis to Ontario. At $1,081 it is 7% cheaper than the average day. Sunday is the most expensive day, 8% above average.

Show the data

What's the cheapest day of the week to fly?
Day	Average fare
Sun	$1,259
Mon	$1,187
Tue	$1,153
Wed	$1,129
Thu	$1,170
Fri	$1,177
Sat	$1,081

When is the best time of day to fly?

Evening (5pm - 9pm) is the cheapest time of day to fly from St. Louis to Ontario. At $1,024 it is 7% cheaper than the average time. Morning (5am - 12pm) is the most expensive time, 8% above average.

Show the data

When is the best time of day to fly?
Time of day	Average fare
Morning	$1,184
Midday	$1,083
Afternoon	$1,104
Evening	$1,024

What do round-trip flights from St. Louis to Ontario cost?

Share of fares in each price range.

Show the data

What do round-trip flights from St. Louis to Ontario cost?
Price range	Share of fares
$600 to $750	6%
$750 to $900	6%
$900 to $1,050	26%
$1,050 to $1,200	<1%
$1,200 to $1,350	49%
$1,350 to $1,500	8%
$1,500 and up	4%

Methodology: learn how we calculate these charts

The charts “What's the cheapest day of the week to fly?” are built from the prices Priceline customers actually paid for flights on this route over the past 12 months or more.

Where a route has too few bookings to fill every point in a chart, we borrow the shape of the curve from a group of routes with similar price behavior and fit it to the fares booked on this route.

Because past fares don’t reflect today’s market, we then adjust the historical prices for current conditions such as inflation and fuel costs, using the round-trip fares found in recent searches on this route.

The charts “What do round-trip flights from St. Louis to Ontario cost?” and “When is the best time of day to fly?” are calculated directly from the fares found in recent searches, not from historical bookings.

Flight Deals from St. Louis to Ontario from $294

Good to Know

Best Ontario Hotel + Flight Packages

Best Ontario Hotel + Flight + Car Packages

What's the cheapest day of the week to fly?

When is the best time of day to fly?

What do round-trip flights from St. Louis to Ontario cost?

Flights to Ontario