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Did you mean flights from St Louis to Ontario, California?

Flights from Ontario, California to St Louis, United States

Ontario, California to St Louis Last modified: Oct 22, 2017 2:02 -04:00Prices shown were found by travelers like you over the past 30 days

We've scanned 51,424,680,537 round trip itineraries and found the cheapest flights to St Louis. Frontier & American frequently offer the best deals to St Louis flights, or select your preferred carrier below to see the cheapest days to fly.

Frontier
ONTSTL
Sat 11/4
1 stop
STLONT
Tue 11/7
1 stop
$268
American
ONTSTL
Mon 1/29
1 stop
STLONT
Wed 1/31
1 stop
$304
United
ONTSTL
Mon 1/29
1 stop
STLONT
Wed 1/31
1 stop
$304
Alaska
ONTSTL
Sun 1/14
1 stop
STLONT
Fri 1/19
1 stop
$386

How Much is a Flight from Ontario, California to St Louis? Prices shown were found by travelers like you over the past 30 days

We have collected flight cost data from across the web for travel from Ontario, California to St Louis, and have found the average flight price for this trip to be $367.

Where To Buy Cheap Flights from Ontario, California to St Louis?

The best way to find a great deal on airfare is to search multiple sites. When you run a search on FareCompare, we search multiple sites and fare sources all at once so you don't have to - which is why we think FareCompare is the best place to find cheap tickets. Airlines can adjust prices for tickets from Ontario, California to St Louis based on the day and time that you decide to book your flight. We have collected data from all airlines, and have found that Tuesdays, Wednesdays, and Saturdays are often the best days to book flights. If you'd like to learn more, read our article about the best time to buy airline tickets.

How far in advance should I book tickets from Ontario, California to St Louis? Prices shown were found by travelers like you over the past 30 days

The chart below shows up-to-date information regarding how far in advance to book your flight from Ontario, California to St Louis.

Non Stop versus Connecting
Advanced PurchaseNon StopConnecting
< 7 days $0 $508
7-14 days $0 $268
14-21 days $0 $338
21-30 days $0 $358
30-60 days $0 $318
60-90 days $487 $313
90+ days $0 $304

Cheapest Day To Fly from Ontario, California to St Louis Prices shown were found by travelers like you over the past 30 days

We've examined 52,664,055,589 itinerary searches that we've seen for departures in the next 90 days and found that the cheapest day to fly from Ontario, California to St Louis is Saturday. See the chart below to compare prices for other days of the week.

Monday Tuesday Wednesday Thursday Friday Saturday Sunday
 $318$501$461$313$268$338

Compare Flight Prices from Ontario, California to St Louis by Month Prices shown were found by travelers like you over the past 30 days

Low priced flights are most commonly available by purchasing between one and three months in advance. International or holiday flights may need to be purchased even further in advance. The chart below shows the cheapest flight prices by month for Ontario, California to St Louis flights.

Month Origin Destination Carrier Depart Date Return Date Stops Price
October Ontario, California St Louis Frontier 10/26/17 10/29/17 1 $508
November Ontario, California St Louis Frontier 11/4/17 11/7/17 1 $268
December Ontario, California St Louis American 12/5/17 12/7/17 1 $318
January Ontario, California St Louis American 1/29/18 1/31/18 1 $304
February Ontario, California St Louis United 2/15/18 2/20/18 1 $304
March Ontario, California St Louis Alaska 3/6/18 3/10/18 1 $475
June Ontario, California St Louis Frontier 6/25/18 6/29/18 1 $448

Cheap Last Minute Flights from Ontario, California to St Louis Prices shown were found by travelers like you over the past 30 days

Looking for cheap last minute flights or a weekend getaway? We've got you covered with weekend flight deals from Ontario, California to St Louis. The chart below shows the best last minute deals and cheap flights this weekend we could find.

Next 30 Days

SunMonTueWedThuFriSat
22 23 24 25 26 27 28
$508
29 30 31 1 2 3 4
$508 $268
5 6 7 8 9 10 11
$268 $338
12 13 14 15 16 17 18
$338
19 20 21 22 23 24 25
$461
26 27 28 29 30 1 2
$461

Connecting Flights vs Direct Flights from Ontario, California to St Louis Prices shown were found by travelers like you over the past 30 days

Flights between some cities may be significantly cheaper if you choose a multi-stop airline ticket. Although these connecting flights sacrifice some convenience, on average, travelers save 20%-60% when they choose to fly multi-stop versus a direct flight.

The average price for connecting flights from Ontario, California to St Louis is $372.

The average price for direct flights from Ontario, California to St Louis is $487.

One Way Flights vs Round Trip Flights from Ontario, California to St Louis Prices shown were found by travelers like you over the past 30 days

We have found that there is often no price difference between buying a round trip flight versus a one way flight. Increased flexibility is the main benefit when it comes to buying a one way flight from Ontario, California to St Louis. However, booking a round trip flight can be a simpler process. You can compare round trip and one way flights by using our flight comparison.

The average price for one way flights from Ontario, California to St Louis is not available.

The average price for round trip flights from Ontario, California to St Louis is $375.

Ontario, California to St Louis Flight Questions

Below are some common questions that asked about this flight route:

Question: What are the most popular connecting cities when flying from Ontario, California to St Louis?
Answer: Chicago, IL

Airlines in Ontario, California flying to St Louis Last modified: Oct 22, 2017 2:02 -04:00Number of routes searched: 120Number of itineraries searched: 48,543

Wondering which airlines fly out of Ontario, California to St Louis? We've gathered the average price of Ontario, California airlines with flights to St Louis. Different airlines offer different levels of comfort and service, so consider convenience when choosing your airline.

Below is the full flight schedule summary showing which days of the week individual carriers offer flights for the next 30 days.

Ontario, California to St Louis
Airline Connections Mon Tue Wed Thu Fri Sat Sun
American -
Alaska -
American PHX
American DFW
American MIA
American ORD
Alaska PDX
Alaska SEA
Major Airlines SLC
Major Airlines ATL
Major Airlines CVG
Major Airlines DTW
Major Airlines MSP
Frontier DEN
United DEN
United SFO
United IAH
United ORD

Ontario, California to St Louis Airports

These are the major commercial airports we're currently monitoring in Ontario, California and St Louis. If your route includes a city with multiple airports, you may be able to find substantial savings by choosing an alternate airport.

Farecompare Research Tools

FareCompare's Flight Schedule Search Tool helps you find information about airline schedule filings, including flight numbers, depart times, and travel distance.

Cheap Domestic Flights from Ontario - ONT Last modified: Oct 22, 2017 2:02 -04:00Prices shown were found by travelers like you over the past 30 days

Cheap International Flights to St Louis - STL Last modified: Oct 22, 2017 2:02 -04:00Prices shown were found by travelers like you over the past 30 days

Cheap Flights from Ontario, California to St Louis