Flights from Ontario (ONT)

Watch this city: Get top deals and price alerts from Ontario (ONT)
Search Cheap Flights from Ontario

Navigate forward to interact with the calendar and select a date. Press the question mark key to get the keyboard shortcuts for changing dates.

Navigate backward to interact with the calendar and select a date. Press the question mark key to get the keyboard shortcuts for changing dates.

Send me great deals:
By proceeding, you agree to our Privacy and Cookies Statement and Terms of Use
Sort By: Price ↑
Airlines
Stops
Fare Type
Nearby Airports
When to Travel
$90RT
Nonstop
Ontario, CA (ONT)toSan Francisco, CA (SFO)
Best Times to Go
Frontier
$110RT
Nonstop|Weekend Deal
Ontario, CA (ONT)toSan Francisco, CA (SFO)
Best Times to Go
Frontier
$120RT
Nonstop
Ontario, CA (ONT)toSan Francisco, CA (SFO)
Sat, Jun 21 - Mon, Jun 23
Frontier
See more deals to San Francisco, CA (SFO)
$108RT
Nonstop
Ontario, CA (ONT)toLas Vegas, NV (LAS)
Best Times to Go
Frontier
$110RT
Nonstop
Ontario, CA (ONT)toLas Vegas, NV (LAS)
Sat, Jun 7 - Sat, Jun 14
Frontier
$130RT
Nonstop|Weekend Deal
Ontario, CA (ONT)toLas Vegas, NV (LAS)
Fri, May 30 - Mon, Jun 2
Frontier
See more deals to Las Vegas, NV (LAS)
$108RT
Nonstop|Midweek Fare
Ontario, CA (ONT)toDenver, CO (DEN)
Best Times to Go
Frontier
$148RT
Nonstop
Ontario, CA (ONT)toDenver, CO (DEN)
Sat, Apr 5 - Tue, Apr 8
Frontier
$157RT
Nonstop
Ontario, CA (ONT)toDenver, CO (DEN)
Sat, May 17 - Tue, May 20
United
See more deals to Denver, CO (DEN)
$110RT
Nonstop|Midweek Fare
Ontario, CA (ONT)toDallas/Fort Worth, TX (DFW)
Best Times to Go
Frontier
$152RT
Nonstop|Weekend Deal
Ontario, CA (ONT)toDallas/Fort Worth, TX (DFW)
Thu, Apr 10 - Sun, Apr 13
Frontier
$172RT
Nonstop
Ontario, CA (ONT)toDallas/Fort Worth, TX (DFW)
Sat, Apr 5 - Tue, Apr 8
Frontier
See more deals to Dallas, TX (DFW)
$120RT
Nonstop
Ontario, CA (ONT)toSeattle, WA (SEA)
Best Times to Go
Frontier
$134RT
Nonstop|Midweek Fare
Ontario, CA (ONT)toSeattle, WA (SEA)
Thu, May 1 - Thu, May 8
Frontier
$149RT
Nonstop|Weekend Deal
Ontario, CA (ONT)toSeattle, WA (SEA)
Thu, Apr 17 - Sun, Apr 20
Frontier
See more deals to Seattle, WA (SEA)
$137RT
Nonstop|Midweek Fare
Ontario, CA (ONT)toPhoenix, AZ (PHX)
Best Times to Go
American
$152RT
Nonstop|Midweek Fare
Ontario, CA (ONT)toPhoenix, AZ (PHX)
Tue, Apr 29 - Tue, May 6
American
$202RT
Nonstop|Weekend Deal
Ontario, CA (ONT)toPhoenix, AZ (PHX)
Best Times to Go
American
See more deals to Phoenix, AZ (PHX)
$144RT
Nonstop|Weekend Deal
Ontario, CA (ONT)toHouston, TX (IAH)
Best Times to Go
Frontier
$223RT
Nonstop|Weekend Deal
Ontario, CA (ONT)toHouston, TX (IAH)
Thu, Apr 3 - Sun, Apr 6
Frontier
$230RT
Nonstop|Midweek Fare
Ontario, CA (ONT)toHouston, TX (IAH)
Wed, Jun 18 - Wed, Jun 25
Frontier
See more deals to Houston, TX (IAH)
$158RT
Ontario, CA (ONT)toReno, NV (RNO)
Sat, Apr 19 - Tue, Apr 22
Delta
$203RT
Ontario, CA (ONT)toReno, NV (RNO)
Best Times to Go
Delta
$213RT
Weekend Deal
Ontario, CA (ONT)toReno, NV (RNO)
Fri, May 23 - Tue, May 27
United
See more deals to Reno, NV (RNO)
$168RT
Nonstop
Ontario, CA (ONT)toPortland, OR (PDX)
Best Times to Go
Frontier
$177RT
Nonstop|Midweek Fare
Ontario, CA (ONT)toPortland, OR (PDX)
Best Times to Go
Alaska
$183RT
Weekend Deal
Ontario, CA (ONT)toPortland, OR (PDX)
Thu, May 1 - Sun, May 4
Delta
See more deals to Portland, OR (PDX)
$178RT
Ontario, CA (ONT)toSacramento, CA (SMF)
Best Times to Go
Delta
$199RT
Ontario, CA (ONT)toSacramento, CA (SMF)
Sat, May 3 - Mon, May 5
United
$206RT
Midweek Fare
Ontario, CA (ONT)toSacramento, CA (SMF)
Wed, May 28 - Wed, Jun 4
Delta
See more deals to Sacramento, CA (SMF)
$183RT
Midweek Fare
Ontario, CA (ONT)toBoise, ID (BOI)
Best Times to Go
Alaska
$229RT
Weekend Deal
Ontario, CA (ONT)toBoise, ID (BOI)
Fri, Apr 25 - Mon, Apr 28
Delta
$234RT
Weekend Deal
Ontario, CA (ONT)toBoise, ID (BOI)
Fri, May 16 - Tue, May 20
Delta
See more deals to Boise, ID (BOI)
$198RT
Nonstop|Midweek Fare
Ontario, CA (ONT)toSalt Lake City, UT (SLC)
Best Times to Go
Delta
$208RT
Nonstop
Ontario, CA (ONT)toSalt Lake City, UT (SLC)
Best Times to Go
Delta
$208RT
Midweek Fare
Ontario, CA (ONT)toSalt Lake City, UT (SLC)
Tue, Apr 29 - Tue, May 6
Frontier
See more deals to Salt Lake City, UT (SLC)
$210RT
Midweek Fare
Ontario, CA (ONT)toTucson, AZ (TUS)
Best Times to Go
Frontier
$216RT
Ontario, CA (ONT)toTucson, AZ (TUS)
Mon, Apr 28 - Mon, May 5
Delta
$228RT
Ontario, CA (ONT)toTucson, AZ (TUS)
Sat, Apr 26 - Mon, Apr 28
Delta
See more deals to Tucson, AZ (TUS)
$212RT
Ontario, CA (ONT)toPasco, WA (PSC)
Sat, May 24 - Wed, May 28
Delta
See more deals to Pasco, WA (PSC)
$217RT
Midweek Fare
Ontario, CA (ONT)toEugene, OR (EUG)
Wed, May 7 - Tue, May 13
Delta
$220RT
Ontario, CA (ONT)toEugene, OR (EUG)
Sat, May 3 - Tue, May 6
Delta
$227RT
Weekend Deal
Ontario, CA (ONT)toEugene, OR (EUG)
Fri, Apr 18 - Mon, Apr 21
Delta
See more deals to Eugene, OR (EUG)
$218RT
Weekend Deal
Ontario, CA (ONT)toSpokane, WA (GEG)
Thu, Apr 17 - Sun, Apr 20
Delta
$220RT
Ontario, CA (ONT)toSpokane, WA (GEG)
Best Times to Go
Delta
$238RT
Ontario, CA (ONT)toSpokane, WA (GEG)
Sat, May 3 - Mon, May 5
Delta
See more deals to Spokane, WA (GEG)
$225RT
Ontario, CA (ONT)toSan Jose, CA (SJC)
Sat, Apr 19 - Mon, Apr 21
Alaska
$260RT
Midweek Fare
Ontario, CA (ONT)toSan Jose, CA (SJC)
Best Times to Go
Alaska
See more deals to San Jose, CA (SJC)
$227RT
Ontario, CA (ONT)toAlbuquerque, NM (ABQ)
Sat, May 24 - Mon, May 26
Delta
$257RT
Ontario, CA (ONT)toAlbuquerque, NM (ABQ)
Mon, Apr 28 - Thu, May 1
Delta
See more deals to Albuquerque, NM (ABQ)
$227RT
Weekend Deal
Ontario, CA (ONT)toAustin, TX (AUS)
Best Times to Go
Delta
$232RT
Weekend Deal
Ontario, CA (ONT)toAustin, TX (AUS)
Best Times to Go
Delta
$236RT
Midweek Fare
Ontario, CA (ONT)toAustin, TX (AUS)
Wed, Apr 30 - Wed, May 7
Delta
See more deals to Austin, TX (AUS)
$234RT
Ontario, CA (ONT)toNashville, TN (BNA)
Best Times to Go
Delta
See more deals to Nashville, TN (BNA)
$236RT
Ontario, CA (ONT)toHouston, TX (HOU)
Best Times to Go
Delta
See more deals to Houston, TX (HOU)
$240RT
Weekend Deal
Ontario, CA (ONT)toMedford, OR (MFR)
Best Times to Go
Delta
See more deals to Medford, OR (MFR)
$248RT
Midweek Fare
Ontario, CA (ONT)toOklahoma City, OK (OKC)
Best Times to Go
Frontier
See more deals to Oklahoma City, OK (OKC)
$251RT
Ontario, CA (ONT)toCalgary, AB (YYC)
Fri, May 2 - Fri, May 9
Air Canada
See more deals to Calgary, Canada (YYC)
$257RT
Nonstop
Ontario, CA (ONT)toNew York, NY (JFK)
Best Times to Go
JetBlue
See more deals to New York City, NY (JFK)
$257RT
Ontario, CA (ONT)toChicago, IL (ORD)
Best Times to Go
Alaska
$259RT
Ontario, CA (ONT)toChicago, IL (ORD)
Tue, Apr 29 - Sat, May 3
Alaska
See more deals to Chicago, IL (ORD)
$257RT
Weekend Deal
Ontario, CA (ONT)toNewark, NJ (EWR)
Best Times to Go
Delta
See more deals to Newark, NJ (EWR)
$258RT
Midweek Fare
Ontario, CA (ONT)toBoston, MA (BOS)
Best Times to Go
Alaska
$260RT
Weekend Deal
Ontario, CA (ONT)toBoston, MA (BOS)
Thu, Jul 17 - Tue, Jul 22
JetBlue
See more deals to Boston, MA (BOS)
Load More Flight Deals