Flights from Frederick to St. Louis

Cheapest flights from Frederick

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.

Thu, Jun 12 - Sat, Jun 14

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$222 Roundtrip, found 18 hours ago

$222

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Jun 12 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Sat, Jun 14, priced at $222 found 18 hours ago

Thu, Jun 12 - Sun, Jun 15

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$231 Roundtrip, found 18 hours ago

$231

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Jun 12 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Sun, Jun 15, priced at $231 found 18 hours ago

Sun, Jul 6 - Tue, Jul 8

BWI

Baltimore Washington Intl. Thurgood Marshall

STL

Lambert-St. Louis Intl.

$240 Roundtrip, found 3 days ago

$240

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sun, Jul 6 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jul 8, priced at $240 found 3 days ago

Mon, Jun 9 - Sun, Jun 15

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$249 Roundtrip, found 18 hours ago

$249

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Mon, Jun 9 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Sun, Jun 15, priced at $249 found 18 hours ago

Sun, Jul 6 - Thu, Jul 10

BWI

Baltimore Washington Intl. Thurgood Marshall

STL

Lambert-St. Louis Intl.

$250 Roundtrip, found 3 days ago

$250

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Sun, Jul 6 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Thu, Jul 10, priced at $250 found 3 days ago

Thu, Jul 3 - Mon, Jul 7

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$255 Roundtrip, found 3 days ago

$255

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jul 3 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Mon, Jul 7, priced at $255 found 3 days ago

Mon, Jun 9 - Thu, Jun 12

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$258 Roundtrip, found 18 hours ago

$258

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Mon, Jun 9 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Thu, Jun 12, priced at $258 found 18 hours ago

Wed, Jul 2 - Thu, Jul 10

BWI

Baltimore Washington Intl. Thurgood Marshall

STL

Lambert-St. Louis Intl.

$260 Roundtrip, found 3 days ago

$260

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Wed, Jul 2 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Thu, Jul 10, priced at $260 found 3 days ago

Thu, Jul 3 - Mon, Jul 7

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$265 Roundtrip, found 3 days ago

$265

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jul 3 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Mon, Jul 7, priced at $265 found 3 days ago

Thu, Jul 3 - Tue, Jul 8

BWI

Baltimore Washington Intl. Thurgood Marshall

STL

Lambert-St. Louis Intl.

$270 Roundtrip, found 3 days ago

$270

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Thu, Jul 3 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Tue, Jul 8, priced at $270 found 3 days ago

Fri, Jun 13 - Sat, Jun 14

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$276 Roundtrip, found 18 hours ago

$276

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Fri, Jun 13 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Sat, Jun 14, priced at $276 found 18 hours ago

Fri, Jun 13 - Sun, Jun 15

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$285 Roundtrip, found 18 hours ago

$285

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Fri, Jun 13 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Sun, Jun 15, priced at $285 found 18 hours ago

Tue, Jul 1 - Sun, Jul 6

BWI

Baltimore Washington Intl. Thurgood Marshall

STL

Lambert-St. Louis Intl.

$290 Roundtrip, found 3 days ago

$290

Roundtrip

found 3 days ago

Select Frontier Airlines flight, departing Tue, Jul 1 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Sun, Jul 6, priced at $290 found 3 days ago

Mon, Jun 9 - Mon, Jun 16

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$294 Roundtrip, found 18 hours ago

$294

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Mon, Jun 9 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Mon, Jun 16, priced at $294 found 18 hours ago

Thu, Jun 12 - Fri, Jun 13

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$303 Roundtrip, found 18 hours ago

$303

Roundtrip

found 18 hours ago

Select Frontier Airlines flight, departing Thu, Jun 12 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Fri, Jun 13, priced at $303 found 18 hours ago

Thu, Jul 3 - Mon, Jul 7

BWI

Baltimore Washington Intl. Thurgood Marshall

STL

Lambert-St. Louis Intl.

$321 Roundtrip, found 3 days ago

$321

Roundtrip

found 3 days ago

Select Spirit Airlines flight, departing Thu, Jul 3 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Mon, Jul 7, priced at $321 found 3 days ago

Thu, Jul 3 - Mon, Jul 7

BWI

Baltimore Washington Intl. Thurgood Marshall

STL

Lambert-St. Louis Intl.

$374 Roundtrip, found 3 days ago

$374

Roundtrip

found 3 days ago

Select American Airlines flight, departing Thu, Jul 3 from Baltimore Washington Intl. Thurgood Marshall to Lambert-St. Louis Intl., returning Mon, Jul 7, priced at $374 found 3 days ago

Thu, Jul 3 - Mon, Jul 7

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$390 Roundtrip, found 3 days ago

$390

Roundtrip

found 3 days ago

Select United flight, departing Thu, Jul 3 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Mon, Jul 7, priced at $390 found 3 days ago

Thu, Jul 3 - Mon, Jul 7

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$444 Roundtrip, found 3 days ago

$444

Roundtrip

found 3 days ago

Select Delta flight, departing Thu, Jul 3 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Mon, Jul 7, priced at $444 found 3 days ago

Thu, Jul 3 - Mon, Jul 7

IAD

Washington Dulles Intl.

STL

Lambert-St. Louis Intl.

$550 Roundtrip, found 3 days ago

$550

Roundtrip

found 3 days ago

Select United flight, departing Thu, Jul 3 from Washington Dulles Intl. to Lambert-St. Louis Intl., returning Mon, Jul 7, priced at $550 found 3 days ago