
Cheap Frontier Airlines flights Ontario (ONT) to St. Louis (STL)
Prices were available within the past 7 days and start at for one-way flights and $210 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Fri, Feb 6 - Fri, Feb 20
ONT
Ontario
STL
St. Louis
$210 Roundtrip, found 19 hours ago
$210
Roundtrip
found 19 hours ago

Fri, Feb 20 - Sat, Mar 7
ONT
Ontario
STL
St. Louis
$220 Roundtrip, found 19 hours ago
$220
Roundtrip
found 19 hours ago

Mon, Feb 9 - Wed, Feb 25
ONT
Ontario
STL
St. Louis
$230 Roundtrip, found 19 hours ago
$230
Roundtrip
found 19 hours ago

Fri, Feb 20 - Fri, Mar 6
ONT
Ontario
STL
St. Louis
$270 Roundtrip, found 19 hours ago
$270
Roundtrip
found 19 hours ago

Wed, Mar 4 - Mon, Mar 16
ONT
Ontario
STL
St. Louis
$280 Roundtrip, found 19 hours ago
$280
Roundtrip
found 19 hours ago

Fri, Jan 30 - Wed, Feb 18
ONT
Ontario
STL
St. Louis
$310 Roundtrip, found 22 hours ago
$310
Roundtrip
found 22 hours ago

Sat, Feb 7 - Wed, Feb 18
ONT
Ontario
STL
St. Louis
$320 Roundtrip, found 19 hours ago
$320
Roundtrip
found 19 hours ago

Sat, Feb 21 - Fri, Mar 6
ONT
Ontario
STL
St. Louis
$330 Roundtrip, found 19 hours ago
$330
Roundtrip
found 19 hours ago

Sat, Feb 28 - Sat, Mar 14
ONT
Ontario
STL
St. Louis
$370 Roundtrip, found 19 hours ago
$370
Roundtrip
found 19 hours ago

Sat, Feb 28 - Fri, Mar 13
ONT
Ontario
STL
St. Louis
$440 Roundtrip, found 19 hours ago
$440
Roundtrip
found 19 hours ago
Find the cheapest month to fly from Ontario (ONT) to St. Louis (STL)
January is typically the cheapest month to fly
From $119 - $593 per traveler.
Travel information
Origin airport | Los Angeles - Ontario Intl. |
|---|---|
Destination airport | Lambert-St. Louis Intl. |
Airlines serving | Delta, Frontier Airlines |
Popular airline | Frontier Airlines |
Distance | 2467 km |
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Most Popular Frontier Airlines Routes from Ontario
Most Popular Frontier Airlines Routes from St. Louis
- Baltimore to Las Vegas (BWI - LAS)
- Buffalo to San Juan (BUF - SJU)
- Tampa to Las Vegas (TPA - LAS)
- Atlanta to San Juan (ATL - SJU)
- New York to Miami (JFK - MIA)
- Chicago to Tampa (ORD - TPA)
- Trenton to Orlando (TTN - MCO)
- New York to San Juan (JFK - SJU)
- Philadelphia to Orlando (PHL - MCO)
- Indianapolis to Miami (IND - MIA)
Popular Domestic Routes in Lambert-St. Louis Intl.
- Orlando to New York (MCO - JFK)
- Denver to Orlando (DEN - MCO)
- Seattle to Phoenix (SEA - PHX)
- Denver to Orlando (DEN - MCO)
- Baltimore to Las Vegas (BWI - LAS)
- Atlanta to Columbus (ATL - CMH)
- Philadelphia to Orlando (PHL - MCO)
- New York to Miami (LGA - MIA)
- Washington to Las Vegas (DCA - LAS)
- Philadelphia to Las Vegas (PHL - LAS)