Cheap flights from Portland, OR to Sidney, MT
Flights starting at $172. Choose between Cape Air, Alaska Airlines, or Allegiant Air to find the best price.
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The most popular airlines for this route are Cape Air, Alaska Airlines, Allegiant Air, Frontier Airlines, and Spirit Airlines. Portland and Sidney have 61 direct flights per week.
Check-in for a flight from Portland to Sidney
Name | Carrier code | IATA Code | Passport needed during booking | Online check-in available |
---|---|---|---|---|
Cape Air | KAP | 9K | Yes | No |
Alaska Airlines | ASA | AS | No | Opens 24 days before flight Closes 1 hours before flight |
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 |
Weather in Sidney
Average Weather
Month | Average monthly max temperature | Average monthly min temperature |
January | -3°C | -12°C |
February | -3°C | -12°C |
March | 4°C | -5°C |
April | 11°C | 0°C |
May | 18°C | 7°C |
June | 25°C | 13°C |
July | 29°C | 17°C |
August | 28°C | 16°C |
September | 23°C | 11°C |
October | 13°C | 3°C |
November | 4°C | -4°C |
December | -3°C | -10°C |
14 day forecast
Frequently asked questions
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Popular routes
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Airports near Portland
- Seattle–Tacoma International
- Portland International
- Eugene
- Roberts Field
- Kenmore Air Harbor Seaplane Base
- Yakima Air Terminal