Flights from St. Louis to Ottawa

Cheapest flights from St. Louis

These prices were available within the past 7 days. Prices quoted are per person, round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Sat, Jun 14 - Tue, Jun 17

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$742 Roundtrip, found 4 days ago

$742

Roundtrip

found 4 days ago

Select United flight, departing Sat, Jun 14 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Tue, Jun 17, priced at $742 found 4 days ago

Tue, Jun 10 - Sat, Jun 14

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$747 Roundtrip, found 4 days ago

$747

Roundtrip

found 4 days ago

Select United flight, departing Tue, Jun 10 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Sat, Jun 14, priced at $747 found 4 days ago

Tue, Jun 10 - Wed, Jun 11

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$752 Roundtrip, found 4 days ago

$752

Roundtrip

found 4 days ago

Select United flight, departing Tue, Jun 10 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Wed, Jun 11, priced at $752 found 4 days ago

Tue, Jun 10 - Fri, Jun 13

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$772 Roundtrip, found 4 days ago

$772

Roundtrip

found 4 days ago

Select United flight, departing Tue, Jun 10 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Fri, Jun 13, priced at $772 found 4 days ago

Sat, Jun 14 - Mon, Jun 16

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$780 Roundtrip, found 4 days ago

$780

Roundtrip

found 4 days ago

Select United flight, departing Sat, Jun 14 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Mon, Jun 16, priced at $780 found 4 days ago

Tue, Jun 10 - Mon, Jun 16

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$785 Roundtrip, found 4 days ago

$785

Roundtrip

found 4 days ago

Select United flight, departing Tue, Jun 10 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Mon, Jun 16, priced at $785 found 4 days ago

Sat, Jun 14 - Thu, Jun 19

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$797 Roundtrip, found 4 days ago

$797

Roundtrip

found 4 days ago

Select United flight, departing Sat, Jun 14 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Thu, Jun 19, priced at $797 found 4 days ago

Sat, Jun 14 - Sat, Jun 21

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$801 Roundtrip, found 4 days ago

$801

Roundtrip

found 4 days ago

Select United flight, departing Sat, Jun 14 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Sat, Jun 21, priced at $801 found 4 days ago

Tue, Jun 10 - Thu, Jun 19

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$802 Roundtrip, found 4 days ago

$802

Roundtrip

found 4 days ago

Select United flight, departing Tue, Jun 10 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Thu, Jun 19, priced at $802 found 4 days ago

Tue, Jun 10 - Sat, Jun 21

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$806 Roundtrip, found 4 days ago

$806

Roundtrip

found 4 days ago

Select United flight, departing Tue, Jun 10 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Sat, Jun 21, priced at $806 found 4 days ago

Thu, Jun 12 - Fri, Jun 13

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$810 Roundtrip, found 4 days ago

$810

Roundtrip

found 4 days ago

Select United flight, departing Thu, Jun 12 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Fri, Jun 13, priced at $810 found 4 days ago

Sun, Jun 15 - Mon, Jun 16

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$818 Roundtrip, found 4 days ago

$818

Roundtrip

found 4 days ago

Select United flight, departing Sun, Jun 15 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Mon, Jun 16, priced at $818 found 4 days ago

Thu, Jun 12 - Mon, Jun 16

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$823 Roundtrip, found 4 days ago

$823

Roundtrip

found 4 days ago

Select United flight, departing Thu, Jun 12 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Mon, Jun 16, priced at $823 found 4 days ago

Sat, Jun 14 - Wed, Jun 18

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$832 Roundtrip, found 4 days ago

$832

Roundtrip

found 4 days ago

Select United flight, departing Sat, Jun 14 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Wed, Jun 18, priced at $832 found 4 days ago

Tue, Jun 10 - Wed, Jun 18

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$837 Roundtrip, found 4 days ago

$837

Roundtrip

found 4 days ago

Select United flight, departing Tue, Jun 10 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Wed, Jun 18, priced at $837 found 4 days ago

Sun, Jun 15 - Thu, Jun 19

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$838 Roundtrip, found 4 days ago

$838

Roundtrip

found 4 days ago

Select United flight, departing Sun, Jun 15 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Thu, Jun 19, priced at $838 found 4 days ago

Sun, Jun 15 - Sat, Jun 21

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$839 Roundtrip, found 4 days ago

$839

Roundtrip

found 4 days ago

Select United flight, departing Sun, Jun 15 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Sat, Jun 21, priced at $839 found 4 days ago

Thu, Jun 12 - Thu, Jun 19

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$840 Roundtrip, found 4 days ago

$840

Roundtrip

found 4 days ago

Select United flight, departing Thu, Jun 12 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Thu, Jun 19, priced at $840 found 4 days ago

Thu, Jun 12 - Sat, Jun 21

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$844 Roundtrip, found 4 days ago

$844

Roundtrip

found 4 days ago

Select United flight, departing Thu, Jun 12 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Sat, Jun 21, priced at $844 found 4 days ago

Tue, Jun 10 - Thu, Jun 12

STL

Lambert-St. Louis Intl.

YOW

Macdonald-Cartier Intl.

$845 Roundtrip, found 4 days ago

$845

Roundtrip

found 4 days ago

Select United flight, departing Tue, Jun 10 from Lambert-St. Louis Intl. to Macdonald-Cartier Intl., returning Thu, Jun 12, priced at $845 found 4 days ago