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Find cheap Delta flights to Ontario

CMH — YYZ
Aug 27 — Sep 31
Thu 8/27
Thu 9/3
1 adult, Economy
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Find Delta flight deals to Ontario

Cheapest Delta flights from USA to Ontario
Explore the most affordable Delta flight options available from USA to Ontario. Find the lowest fares with prices last updated on July 28, 2026.

This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/209:39 am
DCA
-
YYZ
1 stop3h 55m
Delta
Thu 8/276:10 am
YYZ
-
DCA
1 stop5h 18m
Delta
Deal found 7/23$270
This Delta deal was found by Cheapflights users on 7/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/185:25 pm
IAD
-
YYZ
1 stop5h 38m
Delta
Sun 8/306:10 am
YYZ
-
IAD
1 stop4h 13m
Delta
Deal found 7/23$270
This Delta deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/259:45 pm
LGA
-
YYZ
Nonstop1h 56m
Delta
Tue 9/15:05 pm
YYZ
-
LGA
Nonstop1h 46m
Delta
Deal found 7/28$283

Flights to Ontario with Delta at a glance

Find detailed information about Delta flights from USA to Ontario. Explore the options provided by Delta to plan your journey from USA to Ontario. Data last updated July 28, 2026.

Popular in

July

Cheapest in

November

Average price

$331

Round-trip from

$267

One-way from

$116

Good round-trip deal

$348 or less

Good one-way deal

$222 or less
Highest demand for flights to Ontario with Delta; 11% potential price increase.
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Best time to find cheap flights to Ontario with Delta; 2% potential price drop.
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Average price for flights to Ontario with Delta (round-trip).
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Delta
  • Delta
  • 12/4-12/7
  • Nonstop
  • 3h 14m total
  • USA to Ontario
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Delta
  • Delta
  • 8/19
  • Nonstop
  • 1h 56m total
  • USA to Ontario
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Price to beat on a round-trip flight from the United States to Ontario with Delta.
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Price to beat on a one-way flight from the United States to Ontario with Delta.
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Cheapflights Insights

Find cheap Delta flights to Ontario

How long is the flight to Ontario with Delta?

On average, Delta flights from the United States to Ontario take 2 hours 15 minutes. Flights to Ontario from other popular cities in the United States will vary in length. Below are a few examples of popular routes and their flight times.

Delta weekly flight availability to Ontario

The most flights to Ontario operated by Delta are scheduled on a Sunday (33 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (25 on average).

When is the best time to book a flight to Ontario with Delta?

The best time to book a flight to Ontario with Delta is 56 days before departure. On average, fares are higher if you book 75 days before departure.

FAQs for Delta flights to Ontario

  • Is Delta the cheapest airline for a flight to Ontario?

    According to our data Frontier offers the lowest average return price for flights to Ontario; but the fare you pay will vary depending on your time and date of travel. Use Cheapflights to compare your options before booking your flight.

  • Do other airlines fly to Ontario?

    Airlines such as Air Canada, Porter Airlines and United Airlines also operate flights to Ontario. Check Cheapflights to compare fares from Delta and these other carriers.

  • What is the average cost of a flight to Ontario with Delta?

    The typical Delta flight to Ontario averages around $462 for a return flight and around $306 for a one-way ticket.

Reviews from Delta flights to Ontario

See what other users thought of their Delta experience.
Delta
7.8
Good
8,480 reviews
Overview

Entertainment

7.8

Food

7.2

Comfort

7.8

Boarding

8.1

Crew

8.5

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