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$80+ Cheap flights from Raleigh to Ontario (RDU - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
RDU — ONT
Aug 25 — Sep 11
Mon 8/25
Mon 9/1
1 adult, Economy
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Cheapflights Tip: The best prices from Raleigh-Durham to Ontario are usually found in March or July, booked 62 days in advance, depart on a Monday or Wednesday and return on a Wednesday

Cheap flight deals from Raleigh to Ontario

Discover tips and strategies to find the most affordable flight options for your journey from Raleigh (RDU) to Ontario (ONT). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 20, 2025.

Round-trip from

$158
(CheapOair)

One-way from

$80
(CheapOair)

Popular in

December

Cheapest in

March

Average price

$422
From Raleigh-Durham to Ontario
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One-way flight from Raleigh-Durham to Ontario
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Highest demand for flights based on searches. 8% potential increase in price ($35 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Raleigh to Ontario

Cheapest flights from Raleigh to Ontario
Explore the most affordable flight options available from Raleigh to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.

This CheapOair deal was found by Cheapflights users on 8/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/26:06 pmRDU - ONT
1 stop27h 29mFrontier
Sun 10/512:28 pmONT - RDU
1 stop29h 07mFrontier
Deal found 8/18$158
This CheapOair deal was found by Cheapflights users on 8/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/55:23 pmRDU - ONT
1 stop29h 31mFrontier
Sun 9/712:28 pmONT - RDU
1 stop29h 02mFrontier
Deal found 8/18$159
This CheapOair deal was found by Cheapflights users on 8/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/315:21 pmRDU - ONT
1 stop9h 29mFrontier
Sat 11/112:05 pmONT - RDU
1 stop26h 31mFrontier
Deal found 8/18$160
This FlightHub deal was found by Cheapflights users on 8/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/305:21 pmRDU - ONT
1 stop9h 29mFrontier
Mon 11/38:24 amONT - RDU
1 stop9h 51mFrontier
Deal found 8/19$177
This CheapOair deal was found by Cheapflights users on 8/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/35:21 pmRDU - ONT
1 stop9h 29mFrontier
Sat 11/812:05 pmONT - RDU
1 stop25h 31mFrontier
Deal found 8/18$187
This TravelUp deal was found by Cheapflights users on 8/18. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/85:10 pmRDU - ONT
1 stop16h 42mFrontier
Sat 11/1512:05 pmONT - RDU
1 stop25h 31mFrontier
Deal found 8/18$194
This Cheapflightsfares deal was found by Cheapflights users on 8/19. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/510:53 amRDU - ONT
1 stop7h 31mFrontier
Sat 10/117:04 amONT - RDU
1 stop7h 00mFrontier
Deal found 8/19$195
This Frontier deal was found by Cheapflights users on 8/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/2311:07 amRDU - ONT
1 stop7h 25mFrontier
Mon 10/276:53 amONT - RDU
2 stops13h 06mFrontier
Deal found 8/17$198
This CheapOair deal was found by Cheapflights users on 8/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/187:51 pmRDU - ONT
1 stop24h 58mFrontier
Mon 10/276:53 amONT - RDU
1 stop6h 51mFrontier
Deal found 8/18$199
This Frontier deal was found by Cheapflights users on 8/18. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/2510:37 amRDU - ONT
1 stop10h 57mFrontier
Wed 9/312:59 amONT - RDU
1 stop12h 39mFrontier
Deal found 8/18$201
This Frontier deal was found by Cheapflights users on 8/17. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:22 amRDU - ONT
2 stops17h 34mFrontier
Sun 9/287:15 pmONT - RDU
1 stop11h 48mFrontier
Deal found 8/17$205

Cheapflights Fare Finder

 
Customize your flight search to find flights from Raleigh to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 20, 2025.
Use the filters below to find and compare flights from Raleigh to Ontario that are best for you.

Fly from

Raleigh

Fly to

Ontario

Route

Depart

Return

Price

RaleighOntario

RDU - ONT

RDUONT

Raleigh-Durham

Thu 9/25

6:06 pm-6:35 pm

1 stop27h 29m

Ontario

Sun 9/28

12:28 pm-8:35 pm

1 stop29h 07m

$158

RaleighOntario

RDU - ONT

RDUONT

Raleigh-Durham

Thu 9/11

6:06 pm-6:35 pm

1 stop27h 29m

Ontario

Sun 9/14

12:28 pm-8:35 pm

1 stop29h 07m

$158

RaleighOntario

RDU - ONT

RDUONT

Raleigh-Durham

Thu 10/16

6:42 pm-4:28 pm

1 stop24h 46m

Ontario

Sun 10/19

12:49 pm-1:32 pm

1 stop21h 43m

$158

RaleighOntario

RDU - ONT

RDUONT

Raleigh-Durham

Thu 10/2

6:06 pm-6:35 pm

1 stop27h 29m

Ontario

Sun 10/5

12:28 pm-8:35 pm

1 stop29h 07m

$158

RaleighOntario

RDU - ONT

RDUONT

Raleigh-Durham

Thu 9/11

6:06 pm-6:35 pm

1 stop27h 29m

Ontario

Thu 9/18

12:28 pm-8:30 pm

1 stop29h 02m

$158

RaleighOntario

RDU - ONT

RDUONT

Raleigh-Durham

Thu 9/4

6:06 pm-6:35 pm

1 stop27h 29m

Ontario

Sun 9/7

12:28 pm-8:30 pm

1 stop29h 02m

$158

RaleighOntario

RDU - ONT

RDUONT

Raleigh-Durham

Sat 10/18

7:51 pm-5:49 pm

1 stop24h 58m

Ontario

Sun 10/26

12:49 pm-1:32 pm

1 stop21h 43m

$158

RaleighOntario

RDU - ONT

RDUONT

Raleigh-Durham

Thu 10/2

6:06 pm-6:35 pm

1 stop27h 29m

Ontario

Thu 10/9

12:32 pm-1:32 pm

1 stop22h 00m

$158

RaleighOntario

RDU - ONT

RDUONT

Raleigh-Durham

Thu 11/13

5:56 pm-6:49 pm

1 stop27h 53m

Ontario

Sun 11/16

1:46 pm-9:11 pm

1 stop28h 25m

$158

RaleighOntario

RDU - ONT

RDUONT

Raleigh-Durham

Thu 10/23

6:42 pm-4:28 pm

1 stop24h 46m

Ontario

Thu 11/6

1:46 pm-9:11 pm

1 stop28h 25m

$158

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/18

Showing 1-10 of 16 results
1
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Best time to book a flight from Raleigh to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Raleigh with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Raleigh to Ontario

How far ahead should I book a flight from Raleigh to Ontario?

Use this chart to determine the optimal time to book a round-trip flight from Raleigh to Ontario. Price data was last updated on August 8, 2025.

Booking 16 days in advance of your planned departure date is, on average, the best time to get cheap flights from Raleigh to Ontario. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Raleigh to Ontario?

Currently, August is the cheapest month in which you can book a flight from Raleigh to Ontario (average of $246). Flying from Raleigh to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from RDU to ONT?

Find hourly flight availability from Raleigh to Ontario. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 20, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 29% on flights from Raleigh to Ontario by exploring options for tickets in the evening.

What is the cheapest day to fly from Raleigh to Ontario?

Use this chart to determine the cheapest time to fly round-trip from Raleigh to Ontario. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Raleigh to Ontario flight should consider departing on Tuesday evenings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Ontario

Get insights into the airlines that provide service to Ontario. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Ontario. Reviews last updated August 20, 2025.
See what other customers who have flown with Southwest, Delta, and United Airlines from Raleigh to Ontario have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,246 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Delta
8.0
Very good
7,982 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,928 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,207 reviews
Southwest
8.0
Very good
4,246 reviews

Comfort

8.0

Food

7.0

Boarding

8.1

Overall

8.0

Crew

8.6

Entertainment

7.5

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from Raleigh to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Raleigh to Ontario?

    Airlines like Frontier fly from Raleigh to Ontario in about 27h 29m. The time it takes to get you to your destination can typically vary by up to . The distance between Raleigh and Ontario is about 2185 mi.

  • What are the cheapest airlines flying from Raleigh to Ontario round-trip?

    Flying on Frontier is currently your cheapest option to Ontario, with prices starting at $148. Additional round-trip tickets that might be worth considering are offered by Delta and Southwest, with the lowest prices starting at $311 and $324, respectively. These flights start at 63% lower than the current average price 3 months from now.

  • Can I find deals for flights from Raleigh to Ontario that include hotel bookings?

    Yes. In addition to deals on Raleigh to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Raleigh to Ontario?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Raleigh to Ontario.

  • Can I find deals for business class flights from Raleigh to Ontario?

    Yes. Cheapflights offers flight deals from Raleigh to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Raleigh to Ontario?

    Currently, August is the cheapest month in which you can book a flight from Raleigh to Ontario (average of $246). Flying from Raleigh to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Alternative routes for Raleigh to Ontario

See prices for flight routes from nearby airports that may be better suited for you.
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Top 5 airlines flying from Raleigh to Ontario

Discover the top 5 airlines that operate flights from Raleigh to Ontario. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated August 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$148Average$267FlexibilityNo cancel feeOn-time62%
DeltaCheapest$311Average$433FlexibilityNo cancel feeOn-timeN/A
SouthwestCheapest$324Average$454FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$329Average$490FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$330Average$442FlexibilityNo cancel feeOn-time71%

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