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Cheap flights to Ontario from 67 cities

67 cities in 13 countries. In each country, prices we can stand behind come first, then the cheapest.

Departure cities with a recent price: 59

Recent prices: 906

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Fares Aviasales flagged as unusually low

CityFromTripDatesAirportsStopsAirlineFound
San Francisco$20one-way8 DecSFO → ONTnonstopFrontier Airlinesfound 2 days agoOpen this trip
Las Vegas$21one-way29 DecLAS → ONTstops unknownFrontier Airlinesfound 2 days agoOpen this trip
Phoenix$58one-way23 DecPHX → ONTstops unknownAmerican Airlinesfound 2 days agoOpen this trip

When these trips depart

Every price counted here was found on or after 7 Nov.

Return

  • November 2026: 14 cities with a price listed here, from $220

    San Francisco · 22 Nov – 30 Nov · found 2 days ago · See prices for these dates

  • December 2026: 19 cities with a price listed here, from $42

    Las Vegas · 25 Dec – 1 Jan 2027 · found 4 days ago · See prices for these dates

  • January 2027: 2 cities with a price listed here, from $134

    Denver · 8 Jan 2027 – 10 Jan 2027 · found 6 days ago · See prices for these dates

  • February 2027: 4 cities with a price listed here, from $140

    Dallas · 8 Feb 2027 – 16 Feb 2027 · found 6 days ago · See prices for these dates

  • March 2027: 2 cities with a price listed here, from $376

    Minneapolis · 18 Mar 2027 – 30 Mar 2027 · found 2 days ago · See prices for these dates

  • April 2027: 2 cities with a price listed here, from $499

    New York · 16 Apr 2027 – 10 May 2027 · found 2 days ago · See prices for these dates

  • September 2027: 1 city with a price listed here, from $890

    London · 12 Sept 2027 – 7 Oct 2027 · found 5 days ago · See prices for these dates

One-way

  • November 2026: 16 cities with a price listed here, from $57

    Las Vegas · 22 Nov · found yesterday · Open this trip

  • December 2026: 14 cities with a price listed here, from $18

    Las Vegas · 1 Dec · found 3 days ago · Open this trip

  • January 2027: 4 cities with a price listed here, from $109

    Seattle · 10 Jan 2027 · found 6 days ago · Open this trip

  • February 2027: 1 city with a price listed here, from $103

    Washington · 7 Feb 2027 · found 4 days ago · Open this trip

  • March 2027: 1 city with a price listed here, from $183

    New York · 9 Mar 2027 · found 2 days ago · Open this trip

  • September 2027: 1 city with a price listed here, from $178

    New York · 16 Sept 2027 · found 3 days ago · Open this trip

Everywhere, by country

1 traveler · Economy

CityFromTripDatesAirportsStopsAirlineFound
United States
San Francisco$19one-way16 DecSFO → ONTnonstopFrontier Airlinesfound 6 days agoOpen this trip
Salt Lake City$42one-way15 DecSLC → ONT1 stopFrontier Airlinesfound 4 days agoOpen this trip
Oakland$52one-way5 DecOAK → ONT1 stopFrontier Airlinesfound 4 days agoOpen this trip
Las Vegas$57one-way22 NovLAS → ONTnonstopFrontier Airlinesfound yesterdayOpen this trip
Las VegasAs low as $18one-way1 DecLAS → ONTnonstopFrontier Airlinesfound 3 days agoOpen this trip
San Jose$81one-way16 DecSJC → ONTnonstopSouthwest Airlinesfound 6 days agoOpen this trip
Austin$90one-way5 DecAUS → ONT1 stopFrontier Airlinesfound 3 days agoOpen this trip
Dallas$97one-way18 NovDFW → ONT1 stopFrontier Airlinesfound 4 days agoOpen this trip
Chicago$99one-way7 DecORD → ONT1 stopFrontier Airlinesfound 7 days agoOpen this trip
Washington$103one-way7 Feb 2027DCA → ONTstops unknownFrontier Airlinesfound 4 days agoOpen this trip
Seattle$109one-way10 Jan 2027SEA → ONT1 stopFrontier Airlinesfound 6 days agoOpen this trip
Fort Lauderdale$139one-way7 DecFLL → ONT2 stopsFrontier Airlinesfound 6 days agoOpen this trip
Houston$141one-way24 DecHOU → ONTnonstopSouthwest Airlinesfound 3 days agoOpen this trip
Sacramento$147one-way17 NovSMF → ONT1 stopFrontier Airlinesfound 6 days agoOpen this trip
Fargo$151one-way11 DecFAR → ONT2 stopsAllegiant Airfound 5 days agoOpen this trip
Phoenix$152one-way22 NovPHX → ONT1 stopFrontier Airlinesfound yesterdayOpen this trip
PhoenixAs low as $52one-way23 DecPHX → ONT1 stopFrontier Airlinesfound 2 days agoOpen this trip
Miami$153one-way7 DecMIA → ONT2 stopsFrontier Airlinesfound 6 days agoOpen this trip
Knoxville$155one-way16 NovTYS → ONT1 stopAllegiant Airfound 7 days agoOpen this trip
San Antonio$158one-way21 NovSAT → ONT1 stopFrontier Airlinesfound 3 days agoOpen this trip
San Diego$168one-way16 NovSAN → ONT1 stopFrontier Airlinesfound 7 days agoOpen this trip
New York$183one-way9 Mar 2027JFK → ONT1 stopAlaska Airlinesfound 2 days agoOpen this trip
New YorkAs low as $178one-way16 Sept 2027JFK → ONT1 stopAlaska Airlinesfound 3 days agoOpen this trip
Portland$198one-way27 NovPDX → ONT1 stopFrontier Airlinesfound 2 days agoOpen this trip
Stockton$205one-way20 NovSCK → ONT1 stopAllegiant Airfound 6 days agoOpen this trip
Kahului$233one-way6 Jan 2027OGG → ONT1 stopAlaska Airlinesfound 2 days agoOpen this trip
Harlingen$289one-way21 NovHRL → ONT2 stopsSouthwest Airlinesfound 2 days agoOpen this trip
Everett$297one-way19 NovPAE → ONT1 stopAlaska Airlinesfound 2 days agoOpen this trip
Beaumont$310one-way17 NovBPT → ONT1 stopAmerican Airlinesfound 6 days agoOpen this trip
Key West$328one-way19 NovEYW → ONT2 stopsAllegiant Airfound 4 days agoOpen this trip
Anchorage$344one-way2 DecANC → ONT1 stopAlaska Airlinesfound 3 days agoOpen this trip
Yuma$400one-way18 NovYUM → ONT1 stopAmerican Airlinesfound 5 days agoOpen this trip
Pierre$456one-way16 NovPIR → ONT2 stopsUnited Airlinesfound 7 days agoOpen this trip
Jackson$465one-way20 NovMKL → ONT2 stopsDenver Air Connection (DAC)found 3 days agoOpen this trip
Lancaster$476one-way17 NovLNS → ONT2 stopsUnited Airlinesfound 6 days agoOpen this trip
Manhattan$527one-way18 NovMHK → ONT1 stopAmerican Airlinesfound 5 days agoOpen this trip
Las Vegas$43return30 Dec – 31 DecLAS → ONTout nonstop, back nonstopFrontier Airlinesfound 2 days agoSee prices for these dates
Las VegasAs low as $42return25 Dec – 1 Jan 2027LAS → ONTout nonstop, back nonstopFrontier Airlinesfound 4 days agoSee prices for these dates
San Francisco$220return22 Nov – 30 NovSFO → ONTout nonstop, back nonstopFrontier Airlinesfound 2 days agoSee prices for these dates
Los Angeles$231return17 Dec – 25 DecLAX → ONTout 1 stop, back 1 stopFrontier Airlinesfound 3 days agoSee prices for these dates
Houston$292return20 Dec – 24 DecIAH → ONTout 1 stop, back 1 stopFrontier Airlinesfound 2 days agoSee prices for these dates
Minneapolis$376return18 Mar 2027 – 30 Mar 2027MSP → ONTout 1 stop, back 1 stopFrontier Airlinesfound 2 days agoSee prices for these dates
MinneapolisAs low as $322return17 Nov – 24 NovMSP → ONTout 1 stop, back nonstopSun Country Airlinesfound 3 days agoSee prices for these dates
Dallas$408return15 Nov – 15 NovDFW → ONTout 1 stop, back nonstopFrontier Airlinesfound 2 days agoSee prices for these dates
DallasAs low as $140return8 Feb 2027 – 16 Feb 2027DFW → ONTout 1 stop, back 1 stopFrontier Airlinesfound 6 days agoSee prices for these dates
Tampa$426return29 Dec – 3 Jan 2027TPA → ONTout 1 stop, back 1 stopSouthwest Airlinesfound 3 days agoSee prices for these dates
Everett$444return26 Nov – 26 NovPAE → ONTout 1 stop, back 1 stopAlaska Airlinesfound 2 days agoSee prices for these dates
New York$499return16 Apr 2027 – 10 May 2027LGA → ONTout 1 stop, back 1 stopUnited Airlinesfound 2 days agoSee prices for these dates
Long Beach$542return17 Dec – 25 DecLGB → ONTout 1 stop, back 1 stopAlaska Airlinesfound 3 days agoSee prices for these dates
Salt Lake City$84return1 Dec – 8 DecSLC → ONTout 1 stop, back 1 stopFrontier Airlinesfound 5 days agoSee prices for these dates
Oakland$94return26 Nov – 3 DecOAK → ONTout nonstop, back 1 stopFrontier Airlinesfound 7 days agoSee prices for these dates
Denver$134return8 Jan 2027 – 10 Jan 2027DEN → ONTout nonstop, back 1 stopFrontier Airlinesfound 6 days agoSee prices for these dates
Austin$160return6 Feb 2027 – 8 Feb 2027AUS → ONTout 1 stop, back 1 stopFrontier Airlinesfound 6 days agoSee prices for these dates
San Jose$163return24 Dec – 15 Jan 2027SJC → ONTout nonstop, back nonstopSouthwest Airlinesfound 5 days agoSee prices for these dates
Chicago$189return10 Dec – 8 Jan 2027ORD → ONTout 1 stop, back 1 stopFrontier Airlinesfound 7 days agoSee prices for these dates
San Antonio$217return5 Dec – 9 DecSAT → ONTout 1 stop, back 1 stopFrontier Airlinesfound 5 days agoSee prices for these dates
Boise$219return9 Feb 2027 – 23 Feb 2027BOI → ONTout nonstop, back nonstopAlaska Airlinesfound 5 days agoSee prices for these dates
Miami$257return10 Dec – 14 DecMIA → ONTout 1 stop, back 1 stopFrontier Airlinesfound 4 days agoSee prices for these dates
Atlanta$270return27 Nov – 1 DecATL → ONTout 1 stop, back 2 stopsFrontier Airlinesfound 7 days agoSee prices for these dates
Seattle$270return25 Nov – 30 NovSEA → ONTout 1 stop, back nonstopFrontier Airlinesfound 4 days agoSee prices for these dates
Washington$323return10 Dec – 20 DecDCA → ONTout 1 stop, back 1 stopFrontier Airlinesfound 4 days agoSee prices for these dates
Sacramento$325return20 Nov – 23 NovSMF → ONTout 1 stop, back 1 stopFrontier Airlinesfound 6 days agoSee prices for these dates
Fargo$326return11 Dec – 20 DecFAR → ONTout 2 stops, back 2 stopsAllegiant Airfound 7 days agoSee prices for these dates
Stockton$346return19 Nov – 22 NovSCK → ONTout 1 stop, back 1 stopAllegiant Airfound 6 days agoSee prices for these dates
Omaha$372return25 Nov – 28 NovOMA → ONTout 2 stops, back 1 stopFrontier Airlinesfound 6 days agoSee prices for these dates
Cleveland$385return23 Nov – 7 DecCLE → ONTout 1 stop, back 1 stopFrontier Airlinesfound 4 days agoSee prices for these dates
Baltimore$435return18 Nov – 30 NovBWI → ONTout 1 stop, back 1 stopFrontier Airlinesfound 4 days agoSee prices for these dates
Peoria$453return22 Nov – 30 NovPIA → ONTout 1 stop, back 3 stopsAllegiant Airfound 4 days agoSee prices for these dates
Memphis$486return23 Dec – 27 DecMEM → ONTout 1 stop, back 2 stopsAllegiant Airfound 4 days agoSee prices for these dates
Philadelphia$489return28 Dec – 3 Jan 2027PHL → ONTout 1 stop, back 1 stopFrontier Airlinesfound 5 days agoSee prices for these dates
Raleigh$502return23 Dec – 4 Jan 2027RDU → ONTout 1 stop, back 1 stopSouthwest Airlinesfound 4 days agoSee prices for these dates
Sarasota$566return26 Apr 2027 – 4 May 2027SRQ → ONTout 2 stops, back 2 stopsSouthwest Airlinesfound 5 days agoSee prices for these dates
Newburgh$660return14 Nov – 18 NovSWF → ONTout 3 stops, back 2 stopsBreeze Airwaysfound 6 days agoSee prices for these dates
Mexico
Leon/Guanajuato$196one-way24 NovBJX → ONTnonstopVolarisfound 2 days agoOpen this trip
Guadalajara$515one-way3 Jan 2027GDL → ONTnonstopVolarisfound 5 days agoOpen this trip
Guadalajara$510return23 Dec – 3 Jan 2027GDL → ONTout nonstop, back nonstopVolarisfound 7 days agoSee prices for these dates
El Salvador
San Salvador$351one-way20 Jan 2027SAL → ONT2 stopsUnited Airlinesfound 5 days agoOpen this trip
San Salvador$1,018return28 Nov – 15 DecSAL → ONTout nonstop, back 1 stopavianca airlinesfound 4 days agoSee prices for these dates
Nicaragua
Managua$426one-way23 DecMGA → ONT1 stopUnited Airlinesfound 6 days agoOpen this trip
Honduras
San Pedro Sula$443one-way17 DecSAP → ONT1 stopavianca airlinesfound 2 days agoOpen this trip
San Pedro Sula$497return14 Jan 2027 – 28 Jan 2027SAP → ONTout 1 stop, back 1 stopavianca airlinesfound 2 days agoSee prices for these dates
Canada
WinnipegC$1,012 (US$710)return23 Dec – 2 Jan 2027YWG → ONTout 2 stops, back 2 stopsWestJetfound yesterdaySee prices for these dates
WinnipegAs low as C$761 (US$534)return23 Dec – 3 Jan 2027YWG → ONTout 2 stops, back 2 stopsWestJetfound 2 days agoSee prices for these dates
TorontoC$660 (US$463)return29 Dec – 30 DecYYZ → ONTout 1 stop, back 1 stopUnited Airlinesfound 3 days agoSee prices for these dates
OttawaC$800 (US$561)return23 Dec – 28 DecYOW → ONTout 1 stop, back 1 stopUnited Airlinesfound 3 days agoSee prices for these dates
CalgaryC$540 (US$379)return18 Nov – 26 NovYYC → ONTout 1 stop, back 1 stopAlaska Airlinesfound 6 days agoSee prices for these dates
MontrealC$563 (US$395)return5 Dec – 12 DecYUL → ONTout 1 stop, back 1 stopUnited Airlinesfound 7 days agoSee prices for these dates
VancouverC$620 (US$435)return28 Dec – 4 Jan 2027YVR → ONTout 3 stops, back 1 stopWestJetfound 5 days agoSee prices for these dates
Costa Rica
San Jose$628return1 Mar 2027 – 4 Mar 2027SJO → ONTout 2 stops, back 1 stopSouthwest Airlinesfound 5 days agoSee prices for these dates
Germany
Frankfurt$742return16 Feb 2027 – 27 Feb 2027FRA → ONTout 2 stops, back 2 stopsAmerican Airlinesfound 7 days agoSee prices for these dates
Italy
Milan$760return23 Dec – 20 Jan 2027LIN → ONTout 2 stops, back 2 stopsBritish Airwaysfound 4 days agoSee prices for these dates
France
Paris$847return3 Dec – 23 DecCDG → ONTout 1 stop, back 1 stopAmerican Airlinesfound 6 days agoSee prices for these dates
Thailand
Bangkok$865return12 May 2027 – 29 May 2027BKK → ONTout 1 stop, back 1 stopSTARLUX Airlinesfound 8 days agoSee prices for these dates
United Kingdom
London$890return12 Sept 2027 – 7 Oct 2027LHR → ONTout 1 stop, back 2 stopsAlaska Airlinesfound 5 days agoSee prices for these dates
Armenia
Yerevan$912return11 Feb 2027 – 4 Mar 2027EVN → ONTout 2 stops, back 2 stopsLufthansafound 6 days agoSee prices for these dates

Prices are what travelers' searches on Aviasales found in the last 7 days: the price the seller showed on Aviasales; bags may cost extra. Canadian dollars at the Bank of Canada rate of 2026-11-12, US dollars in brackets. Fares change, so check today's price before you book. How our prices work