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Cheap flights from Lambert-St Louis Intl to Ontario International (STL - ONT)

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The best prices from Lambert-St Louis Intl to Ontario International are usually found in October or January, booked 51 days in advance, depart on a Tuesday or Monday and return on a Tuesday

STL - ONT
Price
$257 - $454
Popular in December High demand for flights, 19% potential price rise
Cheapest in October Best time to find cheap flights, 30% potential price drop
Round-trip from $257 From Lambert-St Louis Intl to Ontario International
One-way from $103 One-way flight from Lambert-St Louis Intl to Ontario International
Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.

Cheap flights from Lambert-St Louis Intl to Ontario International in May, June 2020

The best prices found for STL to ONT flights for May, June
29 May - 8 Jun
$187pp
STL
Lambert-St Louis
$self.airline
 
1 STOP
ONT
Ontario
ONT
Ontario
American Airlines
 
1 STOP
STL
Lambert-St Louis
8 Jun - 12 Jun
$227pp
STL
Lambert-St Louis
$self.airline
 
1 STOP
ONT
Ontario
ONT
Ontario
American Airlines
 
1 STOP
STL
Lambert-St Louis
18 Jun - 1 Aug
$236pp
STL
Lambert-St Louis
$self.airline
 
1 STOP
ONT
Ontario
ONT
Ontario
United Airlines
 
1 STOP
STL
Lambert-St Louis

Lambert-St Louis Intl to Ontario International 2020 flight deals

Cheap flights to Ontario International from Lambert-St Louis Intl found for this year
29 May - 8 Jun
$187pp
STL
Lambert-St Louis
$self.airline
 
1 STOP
ONT
Ontario
ONT
Ontario
American Airlines
 
1 STOP
STL
Lambert-St Louis
2 Jul - 16 Jul
$206pp
STL
Lambert-St Louis
Delta
 
1 STOP
ONT
Ontario
ONT
Ontario
Delta
 
1 STOP
STL
Lambert-St Louis
14 Jul - 17 Jul
$222pp
STL
Lambert-St Louis
$self.airline
 
1 STOP
ONT
Ontario
ONT
Ontario
Frontier
 
1 STOP
STL
Lambert-St Louis

Last minute flights from Lambert-St Louis Intl to Ontario International

Late deals on round-trip flights to Ontario International from Lambert-St Louis Intl, departing today and this week
29 May - 8 Jun
$187pp
STL
Lambert-St Louis
$self.airline
 
1 STOP
ONT
Ontario
ONT
Ontario
American Airlines
 
1 STOP
STL
Lambert-St Louis
29 May - 5 Jun
$237pp
STL
Lambert-St Louis
$self.airline
 
1 STOP
ONT
Ontario
ONT
Ontario
American Airlines
 
1 STOP
STL
Lambert-St Louis
29 May - 5 Jun
$453pp
STL
Lambert-St Louis
$self.airline
 
1 STOP
ONT
Ontario
ONT
Ontario
Delta
 
1 STOP
STL
Lambert-St Louis

One-way flights to Ontario International from Lambert-St Louis Intl

The cheapest one-way flights from Lambert-St Louis Intl to Ontario International
1:45 am - 6:25 am
Delta
1 Stop
6h 40m
STL - ONT
Delta
$103
Delta
7:00 am - 1:33 pm
Delta
1 Stop
8h 33m
STL - ONT
Delta
$143
Delta
10:25 am - 5:06 pm
Delta
1 Stop
8h 41m
STL - ONT
Delta
$303
Delta

Related info for your journey

Useful info, stats and facts about Lambert-St Louis Intl to Ontario International flights.

Flight FAQs

From Lambert-St Louis Intl to Ontario International

Are flight prices decreasing from St Louis to Ontario due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both St Louis and Ontario for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

Can I find flights from Lambert-St Louis Intl to Ontario International for under $200 on Cheapflights?

Yes, there are multiple flights from Lambert-St Louis Intl to Ontario International for under $200. The cheapest flight booked recently is on Multiple Airlines for just $187, but on average you can expect to pay $290.

Are there nonstop flights from Lambert-St Louis Intl to Ontario International for under $200 on Cheapflights?

There are no nonstop flights from Lambert-St Louis Intl to Ontario International, but Cheapflights can provide you with all the information you need to find the fastest route with the fewest stops.

Are there last-minute flights available from Lambert-St Louis Intl to Ontario International for under $200?

There are currently 3+ open flights from Lambert-St Louis Intl to Ontario International within the next 7 days for less than $200.

How popular is this flight route?

The Lambert-St Louis to Ontario flight path was viewed by 183 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

What is the cheapest airline for this route?

When searching, try setting your filters to view flights for Southwest Airlines Co., as currently they have the cheapest options available from St Louis to Ontario. On average you can find 219 flights for this flight path daily.

Does it rain more in St Louis or Ontario?

Expected rainfall in St Louis is less than in Ontario. You can expect this to be the case over the next 18 days.

Is St Louis weather warmer or cooler than Ontario?

You can imagine temperatures to be in the 95 °F range in July. The weather in Ontario is generally hotter than St Louis's. As flight availability is subject to become more limited as peak season approaches it is ideal to book in a timely manner.

Alternative routes for Lambert-St Louis Intl to Ontario International

Destination information for Ontario International

Things to know before you go. Useful info for your trip from Lambert-St Louis Intl to Ontario International

Airports servicing St. Louis

Airports servicing Ontario

Hourly flight availability

Morning 6 AM to noon 100% of flight departures
Early morning Midnight to 6 AM 0% of flight departures
Afternoon Noon to 6 PM 0% of flight departures
Evening 6 PM to midnight 0% of flight departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Lambert-St Louis Intl to Ontario International
Sunday
1 daily flight
Monday
1 daily flight
Tuesday
1 daily flight
Wednesday
1 daily flight
Thursday
1 daily flight
Friday
1 daily flight
Saturday
1 daily flight