✈️ Flight Guide: Denver (DEN) → Ontario (ONT)

For flights from Denver International Airport (DEN) to Ontario International Airport (ONT) in August, arrive at least 90 minutes before a domestic flight and 2 hours if you expect long security lines or checked luggage. August is still summer travel season with higher passenger volumes and occasional weather delays, so building extra buffer time helps avoid stress. Check your airline’s recommended arrival time and monitor Denver airport security wait times before departure.

Direct (nonstop) flights between Denver International Airport (DEN) and Ontario International Airport (ONT) are offered seasonally and by select carriers; availability in August can vary. Check carriers like United, Southwest, and American Airlines for current nonstop schedules and book early to lock in direct routes during summer travel. Use airline websites or flight search engines to filter for nonstop DEN to ONT flights.

The average flight time for nonstop services from Denver International Airport (DEN) to Ontario International Airport (ONT) is approximately 2 hours and 15 minutes to 2 hours and 35 minutes, depending on winds and routing. August weather is generally stable, which often means on-time departures, but factor in potential summer air traffic that can affect schedules. Check real-time flight status for the most accurate arrival and departure windows.

Denver International Airport (DEN) offers multiple ground transport options including the A Line commuter rail to downtown Denver, airport shuttle services, rideshare pick-up zones, taxis, and rental cars. If you’re planning to stay near nearby destinations like Boulder, Colorado Springs, or the ski resorts, pre-book shuttle or rental car services to ensure availability during the busy August travel season. Allow extra time for morning and evening traffic when returning to DEN for your flight to Ontario.

Denver International Airport (DEN) provides on-site economy lots, garage parking, and off-site long-term lots with shuttle service; during August expect higher occupancy so reserve in advance. Consider pre-booking official DEN parking or using off-site lots that offer guaranteed spaces and shuttle frequency if you’ll be gone for several days. For convenience, choose the closest garage if you need fast returns; compare prices and reviews before booking.

In August, pack for warm Southern California weather on arrival but bring a light layer for air-conditioned terminals and flights; summer is peak season so book flights and seats early. Monitor Denver's summer thunderstorms that can occasionally delay departures and sign up for airline alerts for real-time updates. Use fare tracking tools for last-minute deals on DEN to ONT routes, and consider early morning flights to reduce delay risk.

Arriving at Ontario International Airport (ONT) in August typically means warm, dry Southern California weather and moderate passenger flow; baggage claim and ground transportation operate efficiently compared to larger LA airports. Expect short taxi and rideshare wait times most days, but weekend and event surges around Inland Empire concerts or festivals can increase demand. Check ONT arrival monitors and pre-book ground transfers if you need guaranteed pickup.

Ontario International Airport (ONT) is approximately 35-40 miles east of downtown Los Angeles, about 10-15 miles from Riverside, and roughly 20-30 miles from San Bernardino depending on route and traffic. Travel times vary widely: plan about 40–70 minutes to Los Angeles or 15–35 minutes to Riverside on typical traffic; peak commute hours can add significant time. Consider using Metrolink, rideshare, or rental cars for flexible access to surrounding cities like Anaheim and Palm Springs.

Yes—Ontario International Airport (ONT) offers scheduled shuttle and private transfer services to major inland destinations and many hotels in Ontario, Riverside, and Anaheim; availability typically increases for August travel. Several private shuttle companies also provide shared-ride and private transfers to Disneyland, Palm Springs, and downtown Los Angeles. Book shuttles in advance during the high summer season to secure preferred pickup windows.

For domestic travelers arriving from Denver, Ontario International Airport (ONT) handles baggage claim locally without customs formalities; simply follow signs to baggage claim and ground transport. Make sure checked luggage adheres to your airline's size and weight policies to avoid fees when arriving. For international connections via ONT, follow posted customs and immigration procedures and allow additional time between connecting flights.

August brings summer concerts, county fairs, and regional events in the Inland Empire and nearby Los Angeles area that can impact hotel rates and arrival traffic near Ontario International Airport (ONT). Check local event calendars for Riverside County Fair or regional sporting events that may increase demand for cars and rideshares. If traveling during festival weekends, book airport hotels and transfers early to avoid higher prices and limited availability.

Ontario International Airport (ONT) offers a selection of quick-service restaurants, coffee shops, and convenience stores in baggage claim and the terminal; many eateries extend hours during summer travel peaks in August. For more dining and shopping choices, nearby areas such as Ontario Mills and downtown Riverside provide expanded options a short drive away. Consider pre-ordering rideshare and checking terminal maps for the latest vendor hours.