Cheap Flights from Ontario International Airport to St. Louis (STL) Find and Compare the Best Airline Deals | Skyticket

Departure Date

2025/4
Sun	Mon	Tue	Wed	Thu	Fri	Sat
		1------	2------	3------	4------	5------
6------	7------	8------	9------	10------	11------	12------
13------	14------	15------	16------	17------	18------	19------
20------	21------	22Search	23Search	24459	25Search	26Search
27Search	28Search	29Search	30Search

Select Return Date　　 Change Departure Date

Return Date

2025/4
Sun	Mon	Tue	Wed	Thu	Fri	Sat
		1------	2------	3------	4------	5------
6------	7------	8------	9------	10------	11------	12------
13------	14------	15------	16------	17------	18------	19------
20------	21------	22------	23------	24------	25------	26------
27------	28------	29------	30------

　　Select Departure Date

Currency:US Dollar Loading Searching Fares Updating Fares

Departure Date

―

Return Date

Total Fares（Round-Trip/Economy）: USD /Per Person

* Displayed fare(s) may differ from the actual search result

Ontario－St. Louis Lambert Airport
April Lowest Airfares
USD459

The airfare displayed above is for United Airlines

Set calendar for this month
Ontario－St. Louis Lambert Airport
May Lowest Airfares
USD328

The airfare displayed above is for Delta Air Lines

Set calendar for this month

Ontario－St. Louis Lambert Airport
June Lowest Airfares
USD598

The airfare displayed above is for Delta Air Lines

Set calendar for this month
Ontario－St. Louis Lambert Airport
July Lowest Airfares
USD371

The airfare displayed above is for Delta Air Lines

Set calendar for this month
Ontario－St. Louis Lambert Airport
August Lowest Airfares
USD394

The airfare displayed above is for Delta Air Lines

Set calendar for this month

Ontario－St. Louis
Estimated Flight Time
4 Hours 25 Minutes
Ontario－St. Louis
Number of Operating Airlines
4

Operating Airlines for Ontario－St. Louis Lambert Airport Route
American Airlines

Alaska Airlines

Delta Air Lines

United Airlines

Other Destinations from:Ontario

Ontario－Syracuse(Hancock)
USD786〜
Ontario－Tampa(TPA)
USD280〜
Ontario－Tucson(TUS)
USD232〜
* Fares vary in accordance to seat availability
Other Departures to: St. Louis

Philadelphia Airport－St. Louis(Lambert)
USD355〜
* Fares vary in accordance to seat availability