Route guide · 197 miles
Cheap Flights from Ontario to Las Vegas
ONT → LAS · Nonstop 0h 54m · Live round-trip fares
Looking for cheap flights from Ontario to Las Vegas? You're in the right place. Airfare Deal tracks live fares on this 197-mile route around the clock. As a rule of thumb, booking 2–4 weeks ahead lands the best prices — and a free fare alert means you never have to keep refreshing the page.
Live fares for ONT → LAS are updating. Use the search below for real-time prices.
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Updated daily
Flight time
0h 54m
Nonstop, typical
Distance
197 mi
ONT → LAS
Book ahead
2–4 weeks
Best window, typically
Nonstop airlines
1
Southwest Airlines
Nonstop flights from Ontario to Las Vegas
The fastest way between the two cities is the nonstop: about 0h 54m for the 197-mile run from ONT to LAS. Those flights are flown by Southwest Airlines. Prices behave best when you book 2–4 weeks out.
Booking insights: Ontario → Las Vegas
- Distance: 197 miles · nonstop flight time: 0h 54m.
- Fares tend to bottom out when you book about 2–4 weeks ahead — earlier than that rarely helps, later usually hurts.
- Tuesday and Wednesday departures usually undercut Friday and Sunday fares on routes like this one.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
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Flying from Ontario to Las Vegas: what you need to know
The flight
At 197 miles, ONT to LAS is one of those quick up-and-down flights: roughly 0h 54m nonstop. There's no meal service to plan around — the decisions that matter here are departure time and which airport entrance traffic is kinder to you.
Airlines on this route
Southwest Airlines flies this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from Ontario (ONT)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our Ontario airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Las Vegas (LAS)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The Las Vegas airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Las Vegas to Ontario fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 197 miles, booking 2–4 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Flexible dates? Search a few days either side — one day can change the fare a lot.
- Morning flights are delayed less often than evening ones — earlier departures have the best on-time record.
- Basic economy fares often exclude checked bags and seat selection. Price the whole trip, not the headline fare.
- Get to the airport two hours before departure; security, not the flight, is the part that runs late.
- If you're traveling with only a carry-on, you can skip the bag-drop line entirely with mobile check-in.
Ontario to Las Vegas flight FAQs
How long is the flight from ONT to LAS?
Plan on about 0h 54m in the air for a nonstop from Ontario to Las Vegas — the route runs roughly 197 miles. Connecting flights typically add 2–4 hours.
Are there nonstop flights from Ontario to Las Vegas?
Southwest Airlines typically operate nonstop flights from ONT to LAS. Nonstops are usually cheapest when booked 2–4 weeks ahead of departure.
What is the cheapest month to fly from Ontario to Las Vegas?
Fares from Ontario to Las Vegas tend to ease outside the peak summer and holiday rush — the late-summer and early-fall shoulder weeks are usually kinder on the wallet. Set a free Airfare Deal alert and we'll flag the dips for your dates.
How much are last minute flights from ONT to LAS?
Book inside the final week and you'll usually pay a premium on ONT to LAS. Fares booked 2–4 weeks ahead are almost always kinder.
What is a good round-trip deal from Ontario to Las Vegas?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from Ontario to Las Vegas?
You'll mainly see Southwest Airlines on Ontario to Las Vegas. Checking each against the live fares below is the surest way to find the lowest price for your dates.
How early should I get to Ontario airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
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