Flights from Saint Louis to Ontario

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Cheap Saint Louis - Ontario flight offers

Find cheap flight tickets and last-minute flight deals from Saint Louis to Ontario

Alaska Airlines
Sat, 10/17 (STL) Saint Louis -> (ONT) Ontario
Alaska Airlines
Wed, 10/21 (ONT) Ontario -> (STL) Saint Louis
Price found Yesterday
from $298
Frontier Airlines
Mon, 10/19 (STL) Saint Louis -> (ONT) Ontario
Frontier Airlines
Fri, 10/23 (ONT) Ontario -> (STL) Saint Louis
Price found Yesterday
from $432
Frontier Airlines
Sun, 10/18 (STL) Saint Louis -> (ONT) Ontario
Frontier Airlines
Thu, 10/22 (ONT) Ontario -> (STL) Saint Louis
Price found Yesterday
from $545
American Airlines
Fri, 10/23 (STL) Saint Louis -> (ONT) Ontario
American Airlines
Fri, 10/23 (ONT) Ontario -> (STL) Saint Louis
Price found 2 days ago
from $643

Info about flights from Saint Louis to Ontario

Some useful info about flights from Saint Louis to Ontario to help you plan your next trip

Best price last 15 days $28
Average flight duration 4h 31m
Cheapest month October
Average number of flights per week 2
First flight time 04:50
Last flight time 22:55
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Top airlines on the route Saint Louis - Ontario

Airlines providing flights to Ontario from Saint Louis

American Airlines
American Airlines
Alaska Airlines
Alaska Airlines
DELTA
DELTA
Frontier Airlines
Frontier Airlines

Find out what a flight from Saint Louis to Ontario might cost

Prices vary based on date, airline, and availability. Compare several options if you're flying between Saint Louis and Ontario.

$28 is the best price recorded in the last 15 days.

Try shifting your departure forward or backward by a day to find better options. If you’re looking for a good deal, consider flying outside peak hours as well.

Which airports near Saint Louis or Ontario offer flights?

In many cases, using a nearby airport can improve your chances of finding direct flights or better rates.

  • Airports in Saint Louis: Only Saint Louis - Lambert is currently operating.
  • Airports in Ontario: Ontario is the only airport in use at the moment.

Secondary airports can offer faster travel thanks to shorter lines and quicker boarding times than major ones.

Plan smarter: flights from Saint Louis to Ontario

Find the flight that fits your plans with Jetcost. You can filter results by stops, agencies, budget, time of day, and airline — all in one search.

Other popular destinations

Travelers flying to United States also checked out: Atlanta, Los Angeles, Miami, New York City, Orlando.

Comparing offers from multiple agencies helps you find the best price for the same route. You can also spot exclusive deals from individual airlines right in the results list.
Frequently Asked Questions

Frequently asked questions about flights from Saint Louis to Ontario.

How much does an airline ticket from Saint Louis to Ontario cost?

The lowest price recorded in the last 15 days for a flight from Saint Louis to Ontario is $28.

How far is Saint Louis from Ontario?

Saint Louis is about 1543 mi from Ontario.

What are the airports in Ontario?

Ontario has one airport: Ontario.

What are the airports in Saint Louis?

Saint Louis has one airport: Saint Louis - Lambert.

What are the most popular cities in United States?

The most popular cities in United States according to our users' searches are: Atlanta, Los Angeles, Miami, New York City, Orlando.

When should I book a flight from Saint Louis to Ontario?

The best time to book a flight from Saint Louis to Ontario is 1 month in advance, while the worst time is 25 weeks in advance.

What is the cheapest month to fly from Saint Louis to Ontario?

The cheapest month to fly from Saint Louis to Ontario is October.

What is the most expensive month to fly from Saint Louis to Ontario?

The most expensive month to fly from Saint Louis to Ontario is May.

What is the best day of the week to fly from Saint Louis to Ontario?

For flights from Saint Louis to Ontario Wednesday is on average the cheapest day to fly, while Saturday is the most expensive day to fly.