Flights from St. Louis to Niagara Falls

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.

Wed, Sep 3 - Tue, Sep 9

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$602 Roundtrip, found 1 day ago

$602

Roundtrip

found 1 day ago

Select American Airlines flight, departing Wed, Sep 3 from Lambert-St. Louis Intl. to Pearson Intl., returning Tue, Sep 9, priced at $602 found 1 day ago

Mon, Sep 1 - Tue, Sep 9

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$624 Roundtrip, found 1 day ago

$624

Roundtrip

found 1 day ago

Select American Airlines flight, departing Mon, Sep 1 from Lambert-St. Louis Intl. to Pearson Intl., returning Tue, Sep 9, priced at $624 found 1 day ago

Sun, Aug 31 - Tue, Sep 9

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$661 Roundtrip, found 1 day ago

$661

Roundtrip

found 1 day ago

Select American Airlines flight, departing Sun, Aug 31 from Lambert-St. Louis Intl. to Pearson Intl., returning Tue, Sep 9, priced at $661 found 1 day ago

Mon, Sep 1 - Mon, Sep 8

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$694 Roundtrip, found 1 day ago

$694

Roundtrip

found 1 day ago

Select Air Canada flight, departing Mon, Sep 1 from Lambert-St. Louis Intl. to Pearson Intl., returning Mon, Sep 8, priced at $694 found 1 day ago

Wed, Aug 27 - Sun, Sep 7

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$704 Roundtrip, found 1 day ago

$704

Roundtrip

found 1 day ago

Select American Airlines flight, departing Wed, Aug 27 from Lambert-St. Louis Intl. to Pearson Intl., returning Sun, Sep 7, priced at $704 found 1 day ago

Fri, Aug 29 - Tue, Sep 9

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$715 Roundtrip, found 1 day ago

$715

Roundtrip

found 1 day ago

Select American Airlines flight, departing Fri, Aug 29 from Lambert-St. Louis Intl. to Pearson Intl., returning Tue, Sep 9, priced at $715 found 1 day ago

Tue, Sep 2 - Sat, Sep 6

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$729 Roundtrip, found 1 day ago

$729

Roundtrip

found 1 day ago

Select American Airlines flight, departing Tue, Sep 2 from Lambert-St. Louis Intl. to Pearson Intl., returning Sat, Sep 6, priced at $729 found 1 day ago

Sun, Aug 31 - Mon, Sep 8

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$732 Roundtrip, found 1 day ago

$732

Roundtrip

found 1 day ago

Select Air Canada flight, departing Sun, Aug 31 from Lambert-St. Louis Intl. to Pearson Intl., returning Mon, Sep 8, priced at $732 found 1 day ago

Fri, Aug 29 - Mon, Sep 8

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$737 Roundtrip, found 1 day ago

$737

Roundtrip

found 1 day ago

Select Air Canada flight, departing Fri, Aug 29 from Lambert-St. Louis Intl. to Pearson Intl., returning Mon, Sep 8, priced at $737 found 1 day ago

Thu, Aug 28 - Mon, Sep 8

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$744 Roundtrip, found 1 day ago

$744

Roundtrip

found 1 day ago

Select American Airlines flight, departing Thu, Aug 28 from Lambert-St. Louis Intl. to Pearson Intl., returning Mon, Sep 8, priced at $744 found 1 day ago

Tue, Sep 2 - Sun, Sep 7

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$752 Roundtrip, found 1 day ago

$752

Roundtrip

found 1 day ago

Select American Airlines flight, departing Tue, Sep 2 from Lambert-St. Louis Intl. to Pearson Intl., returning Sun, Sep 7, priced at $752 found 1 day ago

Tue, Sep 2 - Wed, Sep 3

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$758 Roundtrip, found 1 day ago

$758

Roundtrip

found 1 day ago

Select American Airlines flight, departing Tue, Sep 2 from Lambert-St. Louis Intl. to Pearson Intl., returning Wed, Sep 3, priced at $758 found 1 day ago

Wed, Aug 27 - Wed, Sep 3

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$763 Roundtrip, found 1 day ago

$763

Roundtrip

found 1 day ago

Select American Airlines flight, departing Wed, Aug 27 from Lambert-St. Louis Intl. to Pearson Intl., returning Wed, Sep 3, priced at $763 found 1 day ago

Sun, Aug 31 - Sat, Sep 6

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$770 Roundtrip, found 1 day ago

$770

Roundtrip

found 1 day ago

Select United flight, departing Sun, Aug 31 from Lambert-St. Louis Intl. to Pearson Intl., returning Sat, Sep 6, priced at $770 found 1 day ago

Wed, Aug 27 - Tue, Sep 2

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$771 Roundtrip, found 1 day ago

$771

Roundtrip

found 1 day ago

Select American Airlines flight, departing Wed, Aug 27 from Lambert-St. Louis Intl. to Pearson Intl., returning Tue, Sep 2, priced at $771 found 1 day ago

Mon, Sep 1 - Wed, Sep 3

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$779 Roundtrip, found 1 day ago

$779

Roundtrip

found 1 day ago

Select American Airlines flight, departing Mon, Sep 1 from Lambert-St. Louis Intl. to Pearson Intl., returning Wed, Sep 3, priced at $779 found 1 day ago

Wed, Aug 27 - Sat, Sep 6

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$786 Roundtrip, found 1 day ago

$786

Roundtrip

found 1 day ago

Select American Airlines flight, departing Wed, Aug 27 from Lambert-St. Louis Intl. to Pearson Intl., returning Sat, Sep 6, priced at $786 found 1 day ago

Sun, Aug 31 - Sat, Sep 6

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$897 Roundtrip, found 1 day ago

$897

Roundtrip

found 1 day ago

Select United flight, departing Sun, Aug 31 from Lambert-St. Louis Intl. to Pearson Intl., returning Sat, Sep 6, priced at $897 found 1 day ago

Sun, Aug 31 - Sat, Sep 6

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$897 Roundtrip, found 1 day ago

$897

Roundtrip

found 1 day ago

Select Delta flight, departing Sun, Aug 31 from Lambert-St. Louis Intl. to Pearson Intl., returning Sat, Sep 6, priced at $897 found 1 day ago

Sun, Aug 31 - Sat, Sep 6

STL

Lambert-St. Louis Intl.

YYZ

Pearson Intl.

$1,012 Roundtrip, found 1 day ago

$1,012

Roundtrip

found 1 day ago

Select WestJet flight, departing Sun, Aug 31 from Lambert-St. Louis Intl. to Pearson Intl., returning Sat, Sep 6, priced at $1,012 found 1 day ago