United States and Canada · United States
Cheap flights to Ontario (California)
An easy gateway to Los Angeles, Palm Springs and the San Gabriel Mountains.
- Best weather
- Mar to Jun, Oct to Nov, Jan
- Warmest
- Aug, 35°C
- Airport
- ONT
Best time to visit Ontario (California)
The best time to visit Ontario (California) for the weather is from March to June and from October to November and in January, when daytime highs average 20 to 30°C (68 to 86°F) and it's mostly dry.
There's no real wet season: rain is spread through the year, with the most in February (about 6 rainy days) and the least in June.
The warmest month is August, with highs around 35°C (95°F); the coolest is December, at around 19°C (67°F) by day and 6°C (44°F) at night.
Ontario (California) weather by month
Average daytime highs, overnight lows and rain for each month.
| Month | High | Low | Rain | What it's like |
|---|---|---|---|---|
| January Best | 20°C 68°F | 7°C 45°F | 5 rainy days | Mild and dry |
| February | 20°C 68°F | 8°C 46°F | 6 rainy days | Mild and dry |
| March Best | 22°C 72°F | 9°C 49°F | 5 rainy days | Mild and dry |
| April Best | 24°C 76°F | 11°C 51°F | 4 rainy days | Warm and dry |
| May Best | 27°C 80°F | 13°C 56°F | 2 rainy days | Warm and dry |
| June Best | 30°C 86°F | 16°C 60°F | 0 rainy days | Hot and dry |
| July | 34°C 94°F | 18°C 65°F | 1 rainy day | Hot and dry |
| August | 35°C 95°F | 18°C 65°F | 0 rainy days | Hot and dry |
| September | 33°C 91°F | 18°C 64°F | 1 rainy day | Hot and dry |
| October Best | 28°C 83°F | 14°C 57°F | 2 rainy days | Warm and dry |
| November Best | 24°C 75°F | 9°C 49°F | 4 rainy days | Mild and dry |
| December | 19°C 67°F | 6°C 44°F | 6 rainy days | Mild and dry |
Long-term averages from Ontario, California (Ontario International Airport), 1991–2020. The weather on your dates will vary.
Flying to Ontario (California)
Farepop finds fares to Ontario International Airport (ONT). These are the closest airports Farepop watches in each region, as the crow flies; with stops, the trip is longer.
| From | Closest airports |
|---|---|
| Australia | Brisbane 11,600 km · about 15 hours non-stop Sydney 12,100 km · about 15.5 hours non-stop |
| New Zealand | Auckland 10,600 km · about 13.5 hours non-stop Wellington 10,900 km · about 14 hours non-stop |
| United States | San Francisco 360 mi · about an hour non-stop Seattle 960 mi · about 2.5 hours non-stop |
| Canada | Vancouver 1,700 km · about 2.5 hours non-stop Calgary 1,900 km · about 3 hours non-stop |
| United Kingdom | Belfast 5,100 mi · about 10.5 hours non-stop Glasgow 5,100 mi · about 10.5 hours non-stop |
| Europe | Cork 8,200 km · about 11 hours non-stop Dublin 8,300 km · about 11 hours non-stop |
How Farepop finds cheap flights to Ontario (California)
Compared with the usual price
Every fare is compared with what the same route usually costs for the same trip length and dates. Around busy holidays we use quieter neighbouring months, so a peak price never passes for a saving.
At least 25% below
A deal is at least 25% below the usual price for those dates, and a good fare at least 20%. Full-service airlines selling at budget prices, and travel agents undercutting the airline, are labelled as such.
Checked twice, then again
Fares are checked again on their exact dates before you hear about them, and regularly after. Ones that no longer qualify are withdrawn.
You book direct
Farepop doesn't sell tickets. Tap a deal and book with the airline or travel site; always check the final price, baggage and conditions before you pay.
The full rules are in our savings methodology.
Ontario (California): questions
When is the best time to visit Ontario (California)?
For the weather, from March to June and from October to November and in January, when daytime highs average around 25°C. These are long-term averages from Ontario, California (Ontario International Airport), 1991–2020.
Does it rain a lot in Ontario (California)?
Ontario (California) has no distinct wet season. February is usually the wettest month, with about 6 rainy days.
Which airport do you fly into for Ontario (California)?
Farepop finds fares to Ontario International Airport (ONT).
How can I find cheap flights to Ontario (California)?
Be flexible with your dates and let the fares come to you. Farepop watches flights from your home airports and alerts you when a trip to Ontario (California) costs at least 25% less than it usually does for those dates, so you can book before the fare goes.
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