Cheap flights from Portsmouth, MA to Ontario, CA
Flights starting at $156. Choose between Allegiant Air, Frontier Airlines, or Spirit Airlines to find the best price.
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Tips to know when travelling to Ontario
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Book your trip to arrive at Ontario International, or Montclair (Ontario). The most popular airlines for this route are Allegiant Air, Frontier Airlines, Spirit Airlines, Sun Country Airlines, and Alaska Airlines. Portsmouth and Ontario have 34 direct flights per week.
Check-in for a flight from Portsmouth to Ontario
Name | Carrier code | IATA Code | Passport needed during booking | Online check-in available |
---|---|---|---|---|
Allegiant Air | AAY | G4 | No | Opens 24 days before flight Closes 1 hours before flight |
Frontier Airlines | FFT | F9 | No | Opens 24 days before flight Closes 1 hours before flight |
Spirit Airlines | NKS | NK | No | Opens 24 days before flight Closes 1 hours before flight |
Sun Country Airlines | SCX | SY | Yes | No |
Alaska Airlines | ASA | AS | No | Opens 24 days before flight Closes 1 hours before flight |
Weather in Ontario
Average Weather
Month | Average monthly max temperature | Average monthly min temperature |
January | 18°C | 7°C |
February | 18°C | 7°C |
March | 20°C | 8°C |
April | 23°C | 10°C |
May | 25°C | 13°C |
June | 29°C | 16°C |
July | 33°C | 19°C |
August | 33°C | 20°C |
September | 32°C | 18°C |
October | 27°C | 15°C |
November | 22°C | 10°C |
December | 17°C | 7°C |
14 day forecast
Frequently asked questions
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Airports near Portsmouth
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