Planning a Trip? Cheapest Flights…

Current Flight Prices: DEN to ONT

Analyzing the fare data from the last forty-eight hours reveals some exceptional opportunities for budget-conscious flyers. The market has recently seen a sharp drop in prices for specific departure dates, offering rates that are well below the seasonal average. The absolute lowest fare currently on record is a remarkable $68 via City.Travel. This price point was observed for a nonstop flight departing on May 12, 2026. Following closely behind is another offer from City.Travel for the same departure date, May 12, priced at $69. These two options represent the floor for the current market, providing an incredibly affordable way to travel between Colorado and California.

While the City.Travel options dominate the bottom of the price ladder, other aggregators are also showing competitive rates, though slightly higher than the $68 to $69 range. Farera is offering nonstop service on this route for $113, with departures scheduled for May 3, 2026. There are multiple seat options available at this specific price point through the same provider, also for the May 3 departure, listed at $115 and $116. This clustering of prices suggests that May 3 is another high-demand date where inventory is moving, though the cost is approximately forty to fifty dollars higher than the deals found a week later on May 12. For travelers who have flexibility in their schedule, the difference between departing on May 3 versus May 12 is substantial, making the later date the superior financial choice.

It is important to note that all of the currently listed lowest fares involve nonstop travel. The $68 and $69 options found via City.Travel explicitly list zero stops, as do the $113, $115, and $116 options via Farera. This indicates that travelers do not need to sacrifice time or convenience to secure these low rates. Typically, the cheapest fares involve layovers or long connection times, but the current data for the DEN to ONT route shows that efficiency and economy are aligning. The disparity between the $68 price point and the $113 price point, despite both being nonstop flights, highlights the volatility of pricing based solely on the specific day of the week. In this case, shifting departure plans by just over a week results in significant savings.

Best Time to Book Flights to ONT

When examining the specific dates provided in the recent data, a pattern emerges regarding timing and availability. The lowest fare of $68 is set for a departure in May, which is generally considered a shoulder season for travel to Southern California, sandwiched between the spring break rush and the peak summer vacation period. Travelers looking to replicate these kinds of savings should target mid-spring and early fall windows. The data shows that prices can fluctuate by nearly fifty dollars within a span of just nine days, as seen when comparing the May 3 fares to the May 12 fares. This sensitivity to specific dates suggests that flying mid-week or on off-peak days within May yields the best financial results.

For those planning travel from Denver , it is usually advisable to monitor prices at least three to four months in advance for domestic routes to California. The appearance of fares as low as $68 in August for flights the following May suggests that advance booking is catching the sweet spot where airlines are trying to fill seats. Prices typically rise as the departure date approaches, especially for nonstop flights which are in higher demand. The fact that these rates are available for nonstop travel further emphasizes that booking early secures not just a lower price, but a better overall flight experience. Travelers should avoid waiting until the last minute for this specific route, as the inventory for these sub-$100 fares is likely to evaporate quickly.

Historically, the DEN to ONT route sees price increases during major holidays and the summer months of June, July, and August. Since the current data reflects travel in May, it serves as a benchmark for what is achievable outside of the peak travel windows. To secure rates in the $68 to $116 range, avoiding the traditional school vacation periods is essential. The data suggests that the “sweet spot” for booking this route is likely 60 to 90 days out, provided one is targeting a shoulder-season month like May. If you must travel during peak times, expect to pay a premium over the $68 baseline, but use these figures as a reference point to gauge whether a deal is truly fair.

Direct vs. Connecting Flights

One of the most significant takeaways from the current price data is that the cheapest available options are all nonstop flights. This is a favorable scenario for travelers departing from Denver. Often, the lowest fares found on search engines are basic economy tickets that require one or two stops, turning a two-hour flight into a six-hour journey. However, the recent database shows that City.Travel and Farera are offering zero-stop flights for $68, $69, $113, $115, and $116. This means that the most economical choice is also the fastest and most convenient option. Travelers can reach their destination in Southern California without the hassle of deplaning, changing gates, or risking missed connections due to delays.

The dominance of nonstop pricing at the bottom of the market suggests that there is robust competition on this route. Airlines are competing directly on price for the convenience of a direct flight. For a route like DEN to ONT, which covers roughly 830 miles, a connecting flight is usually an unnecessary burden. The data confirms that you do not need to trade your time for money right now. Even at the higher end of the low-price spectrum, the $116 fare via Farera remains a nonstop service. This consistency across multiple price points and different booking platforms indicates that the lowest cost of entry for this route guarantees a direct flying experience.

Choosing a nonstop flight also eliminates the variable costs associated with connections, such as purchasing expensive food at a connecting airport or paying for ground transportation between distant terminals. While the ticket price is the primary concern, the value of arriving in Ontario in roughly two hours versus five or six is substantial. The current market data eliminates the dilemma of choosing between a cheap, long flight and an expensive, short flight. In this instance, the market is aligning to offer the best of both worlds: low cost and high efficiency. Travelers should filter their search results to show only nonstop flights, as the data proves these are currently the best financial deals available.

Which Airlines Fly This Route?

While the data provided highlights specific booking platforms like City.Travel and Farera, it is crucial to look at the underlying carriers operating these flights. The route between Denver and Ontario is heavily dominated by Southwest Airlines , which utilizes Denver as a major hub and Ontario as a key point in its California network. Southwest is well known for its nonstop service between these two cities, and the low prices of $68 and $69 are highly characteristic of the airline’s aggressive pricing structures and sales. Although the booking sites listed are aggregators, the flight schedules and zero-stop descriptions point directly toward Southwest or potentially United, which also maintains a large hub in Denver.

Frontier Airlines is another strong contender for this route. As an ultra-low-cost carrier based in Denver, Frontier frequently offers rock-bottom introductory fares to stimulate demand on routes to leisure destinations like Ontario. The presence of fares as low as $68 strongly suggests the involvement of an ultra-low-cost carrier, as legacy carriers typically maintain higher base fares. The pricing structure seen here, particularly the $68 entry point, is a hallmark of Frontier’s “Basic Economy” or “Saver” fare tiers. These fares usually come with restrictions regarding carry-on luggage and seat selection, but they provide unbeatable prices for travelers willing to travel light.

United Airlines also operates nonstop flights from Denver to Ontario. As a legacy carrier, United’s prices tend to sit slightly higher than the budget airlines, which aligns with the $113 to $116 range observed in the data. While United might not always match the absolute lowest fare of $68, the prices listed via Farera in the $115 range could easily represent United’s basic economy offerings or a sale on their standard economy seats. Travelers using City.Travel or Farera might see these flights branded under United or possibly American, though Southwest flights are sometimes excluded from certain third-party aggregators. Regardless of the specific metal, the data confirms that major carriers are actively competing on price for this nonstop corridor.

Money-Saving Tips for DEN to ONT Flights

To capture fares similar to the $68 and $69 deals recently recorded, travelers should adopt a flexible approach to their planning. The data clearly shows a price difference of nearly $45 between departing on May 3 and May 12. This illustrates that shifting your departure date by just a week can result in massive savings. If your schedule permits, use flexible date search tools to visualize the price calendar around your intended travel window. Avoiding Fridays and Sundays, which are typically expensive travel days, in favor of mid-week departures like Tuesdays or Wednesdays, can help you land in that lower price tier.

Another strategy is to book through aggregators that show the lowest total price, as evidenced by the City.Travel listings. However, always double-check the final price on the airline’s direct website after finding a deal on an aggregator to ensure there are no hidden fees. The $68 fare likely comes with restrictions on carry-on bags. If you can pack everything into a backpack or small personal item that fits under the seat, you can avoid the extra fees that would negate the savings. The goal is to keep the total cost of travel close to that base fare of $68.

Setting up price alerts is also essential given the volatility seen in this data. Prices jumped from the $60s to the $110s within a matter of days. An alert would notify you the moment the fare drops back down to that $68 sweet spot. Additionally, consider booking immediately when you see a fare like $68 for a nonstop cross-country route. These inventory levels are finite and disappear quickly. The data shows that the lowest fares are available now, but waiting even a few days could push you into the $113+ bracket. Finally, be wary of add-ons. The $68 ticket is a great deal, but only if you refuse to pay for seat selection, priority boarding, or checked bags.

What to Expect When You Arrive in ONT

Ontario International Airport is generally a much more user-friendly experience than the larger airports in the Los Angeles basin. After a short nonstop flight from Denver, you will find that deplaning and navigating the terminal is quick and efficient. The airport has undergone significant renovations in recent years, modernizing the facilities and improving the passenger experience. Because it is smaller than LAX, the walk from the gate to baggage claim or ground transportation is usually manageable, often taking less than twenty minutes. This efficiency is a perfect complement to the low-cost, nonstop fares you secured.

Transportation options from ONT are plentiful and reasonably priced. Depending on your final destination in the Inland Empire or Orange County , rental cars are available at competitive rates. Ride-share services like Uber and Lyft have designated pickup zones that are well-organized, reducing the wait time typically associated with larger airports. If you are heading to downtown Los Angeles or surrounding areas, the drive can take anywhere from forty-five minutes to over an hour depending on traffic conditions, so plan accordingly. However, if your destination is local to Ontario, Riverside, or San Bernardino, you will be at your hotel very shortly after landing.

The airport itself offers a decent selection of dining and shopping options, though not as extensive as a mega-hub. Given the short duration of the flight from Denver, you likely will not need a full meal upon arrival, but there are options for coffee and snacks if necessary. The customs and immigration processes are streamlined here as well, though for domestic flights from Denver, you will simply walk out of the secure area. Overall, arriving at ONT reinforces the value of choosing this route. You save money on the ticket, save time with a nonstop flight, and save stress by navigating a smaller, more accessible airport upon arrival.