ONT

Find cheap Delta flights to Ontario from $70

1 adult
1 adult, Economy, 0 bags

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Flight Deals

Cheap Delta Flight Deals to Ontario

 
Here are some of the best deals found on KAYAK recently from Delta to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip Delta flight deals to Ontario

Sat, Jan 17 - Sun, Jan 18
Delta Logo
5:25 am - 12:16 pm
SEA
-
ONT
6h 51m1 stop
Delta Logo
7:30 am - 10:36 am
ONT
-
SEA
3h 06mnonstop
$129Delta
Fri, Jan 9 - Mon, Jan 12
Delta Logo
6:05 pm - 10:38 pm
SEA
-
ONT
4h 33m1 stop
Delta Logo
5:07 pm - 11:22 pm
ONT
-
SEA
6h 15m1 stop
$139Delta
Thu, Jan 22 - Sun, Jan 25
Delta Logo
8:07 pm - 10:51 pm
SEA
-
ONT
2h 44mnonstop
Delta Logo
7:30 am - 10:36 am
ONT
-
SEA
3h 06mnonstop
$149Delta
Thu, Jan 22 - Sun, Jan 25
Delta Logo
8:07 pm - 10:51 pm
SEA
-
ONT
2h 44mnonstop
Delta Logo
7:30 am - 10:36 am
ONT
-
SEA
3h 06mnonstop
$150Delta
Fri, Jan 9 - Tue, Jan 13
Delta Logo
8:07 pm - 10:51 pm
SEA
-
ONT
2h 44mnonstop
Delta Logo
3:30 pm - 6:35 pm
ONT
-
SEA
3h 05mnonstop
$159Delta
Tue, Mar 10 - Tue, Mar 17
Delta Logo
7:50 pm - 10:33 pm
SEA
-
ONT
2h 43mnonstop
Delta Logo
6:00 am - 8:55 am
ONT
-
SEA
2h 55mnonstop
$167Delta
Sat, Jan 10 - Mon, Jan 12
Delta Logo
8:07 pm - 10:51 pm
SEA
-
ONT
2h 44mnonstop
Delta Logo
5:07 pm - 11:22 pm
ONT
-
SEA
6h 15m1 stop
$169Delta
Sat, Jan 10 - Mon, Jan 12
Delta Logo
8:07 pm - 10:51 pm
SEA
-
ONT
2h 44mnonstop
Delta Logo
5:07 pm - 11:22 pm
ONT
-
SEA
6h 15m1 stop
$170Delta
Sat, Jan 10 - Wed, Jan 14
Delta Logo
9:05 am - 9:48 pm
SEA
-
ONT
12h 43m2 stops
Delta Logo
3:30 pm - 6:35 pm
ONT
-
SEA
3h 05mnonstop
$172Delta
Tue, Mar 10 - Tue, Mar 17
Delta Logo
2:30 pm - 5:12 pm
SEA
-
ONT
2h 42mnonstop
Delta Logo
1:20 pm - 6:30 pm
ONT
-
SEA
5h 10m1 stop
$176Delta
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Good to know

Low seasonSeptember
Cheapest flight$70
Average price round-trip$456
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly with an average 6% increase in price.
Flight from Seattle to Ontario
(price for this month)

When to book flights with Delta to Ontario

Average price per month
Flight prices as travel date approaches

FAQs for flying to Ontario with Delta

  • Which other airlines fly to Ontario?

    Along with Delta, you can also fly to Ontario with Southwest, Frontier, United Airlines and Alaska Airlines.

  • How much is a flight to Ontario with Delta?

    On average, Delta flights to Ontario cost $403 one-way.

  • Which airport do Delta flights to Ontario fly into?

    You’ll fly into Ontario Airport when flying to Ontario with Delta.

  • Are there any other airlines in SkyTeam that fly to Ontario?

    Unfortunately, there are no other airlines in SkyTeam that fly to Ontario.

Top tips for your flights to Ontario with Delta

  • The cheapest flight to Ontario with Delta found on KAYAK in the last 2 weeks departed from Salt Lake City and cost $198.
  • If you’re intending to fly with Delta, book your flight to Ontario at least 2 weeks before departure to ensure a below-average price.
  • High season for flights to Ontario with Delta is December and prices are highest at this time. The cheapest month to fly is September.

Delta customer reviews

7.9
Good8,019 verified ratings
8.5Crew
7.9Comfort
7.9Entertainment
7.3Food
8.1Boarding
Pros +
  • The crew was extremely helpful and friendly! (in 1210 reviews)
Cons -
  • Air flow from air above seats was blowing out hot air. (in 568 reviews)
  • "Too many people, especially children running up and down aisles during flight." (in 1504 reviews)
Show reviews that mention
Traveler rating:
Sort by:
D
10.0 Wonderful
Food could've been better.
G
2.0 Poor
Flight delays both to Detroits and return flight . The flight to Detroit was associated with mechanical difficulty
S
10.0 Wonderful
Flight was operated by Virgin Atlantic and it was up to their usual high standard. Minor grips about some issues, but they are really first world issues and as a whole, was an excellent flight.
E
4.0 Mediocre
I am extremely disappointed that delta internal pilot manuals now refer to the Gulf of Mexico as the “gulf of America”. You can bow down to the Orange turd on your own. I will never fly delta again
D
8.0 Very good
Delta One upgrade it would have been great if my tray extended (it was jammed and wouldn’t pull out), seatbelt had too much slack & my little cabin door didn’t close properly
S
2.0 Poor
I paid for a business class ticket on Delta. It was sourced to Virgin Atlantic. They changed out the aircraft which had fewer upper class tickets. Even though I'd checked into the lounge, was receiving alerts via kayak about the delay and changes; no one informed me that the seat would be changed - until I attempted to board and was told that I would have an economy seat or they could search to put me on another airline. Even the flight crew were informed of this change (10 passengers were bumped out of Upper Class) around 2 pm (1400) time. Hours would have helped to consider alternatives instead of making a last minute change. There needs to be compensation from both Delta and Virgin given this change in service/experience.
W
2.0 Poor
Wasn't a Delta issue I don't think, but seems there was a Delta flight at each of the 2 Dallas airports at the same exact time, both to Atlanta. I was evidently booked on the one at Love Airport, but the Carey transport shuttle took me to DFW instead and I ended up missing the flight by just a few minutes. Was able to book a Southwest flight from Love Airport, but was a big loss of time and an inconvenience.
J
10.0 Wonderful
Smooth.
A
4.0 Mediocre
Our flight was held more than 1.5 hours due to baggage issues and overbooking. Our bag was never tagged and caused an unnecessary amount of stress. Personnel on the Delta side were mediocre at best and seemed to not care about customers and seemed like they hated their work.
I
10.0 Wonderful
Delta is great! Always have positive experience.
Read more about Delta

Everything you need to know for your flight to Ontario

Other airlines flying to Ontario

Flight deals from the most popular airlines with KAYAK users flying the route
Frontier flights to Ontario
Alaska Airlines flights to Ontario
Southwest flights to Ontario
United Airlines flights to Ontario
American Airlines flights to Ontario