$51 Find Cheap Flights from Idaho to Washington

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Low seasonFebruary
High seasonJuly
Cheapest flight$51
Best time to beat the crowds with an average 9% drop in price.
Most popular time to fly with an average 4% increase in price.
Flight from Boise to Seattle

FAQs for booking flights from Idaho to Washington

  • How does KAYAK find such low prices on flights from Idaho to Washington?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Idaho to Washington.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Idaho to Washington?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Idaho to Washington is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Idaho to Washington?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Idaho to Washington with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Idaho to Washington?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Idaho to Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which is the cheapest airport to fly into in Washington?

    Prices will differ depending on the departure airport, but generally, the cheapest airport to fly to in Washington is Spokane Airport (GEG), with an average flight price of $203.

  • What is the cheapest day to fly to Washington?

    Based on KAYAK data, the cheapest day to fly to Washington is Thursday where round-trip tickets can be as cheap as $416. On the other hand, the most expensive day to fly is Sunday, where round-trip prices are $518 on average.

  • What is the cheapest time of day to fly to Washington?

    The cheapest time of day to fly to Washington is generally at night, when round-trip flights cost $389 on average. Morning departures are around 1% more expensive than evening flights, on average. The most expensive time of day to fly to Washington is generally in the morning, which is peak travel time and where the average cost of a ticket is $476.

  • What is the cheapest flight to Washington?

    The cheapest ticket to Washington from Idaho found in the last 72 hours was to Spokane, at $137 round-trip. The most popular route is Boise (BOI) to Seattle (SEA) and the cheapest round-trip airline ticket found on this route in the last 72 hours was $157.

  • What is the cheapest month to fly from Idaho to Washington?

    The cheapest month for flights from Idaho to Washington is September, when tickets cost $176 (return) on average. On the other hand, the most expensive months are June and November, when the average cost of round-trip tickets is $236 and $227 respectively.

  • How far in advance should I book a flight from Idaho to Washington?

    To get a below average price on the flight from Idaho to Washington, you should book around 4 weeks before departure. For the absolute cheapest price, our data suggests you should book 4 weeks before departure.

  • How long is the flight to Washington?

    An average nonstop flight from Idaho to Washington takes 3h 13m, covering a distance of 374 miles. The shortest route is Boise (BOI) to Pullman (PUW) with an average flight time of 1h 00m.

  • What are the most popular destinations in Washington?

    Based on KAYAK flight searches, the most popular destination is Seattle (73% of total searches to Washington). The next most popular destinations are Portland (17%) and Spokane (9%). Searches for flights to Pullman (1%) and to Pasco (0%) are also popular.

Reviews of the top 3 airlines serving from Idaho to Washington

 
Need help choosing which airline to fly with from Idaho to Washington? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.0
Alaska AirlinesOverall score based on 10000 reviews
7.1Food
8.5Crew
7.1Entertainment
8.1Boarding
7.8Comfort
Airline reviews

Paying for first class and then they want $8:00 for wifi.

4.0 OkayGreg, Jul 2025SFO - SEA
Read more Alaska Airlines reviews

Paying for first class and then they want $8:00 for wifi.

10 hour delay. Fuel spill. Crew had to drive to Indianapolis to a get a plane. The longest day of travel ever. Poor service.Little to no communication.

I'm so glad that Alaska still keeps this little "puddle-jumper" route going between SEA>ALW; my daughter lives on Walla Walla, and it's so much quicker to be able to fly right in to Walla Walla than to have to fly into Tri-Cities and then make her drive 40 minutes each way. This flight is usually only 50%-75% full when I fly it, but that's because it doesn't get in to ALW until MIDNIGHT! But thanks for continuing to service the Walla Walla area, Alaska!

Easy flight, crew was polite & observant of all passenger needs as well as safety.

fine. only problem,,,, for some,,,,was that many people started trying to exit from the back of the plane,, . lots of irate people. there should be a flight attendant mid plane..to be sure that doesn't happen. The crew up front had no idea what was happening. One big guy started it..then a bunch of others followed his lead. could have gotten ugly... One man stepped in and questioned those rule breakers.. nothing bad happened,,,but......

We were delayed. We spent more time waiting on the plane than actually flying (it’s only a 37 minute flight). Other than that, it was fine.

Only offered water, no snacks provided, and it was cold on the plane, everyone was wearing sweatshirt or jacket in June. I asked for blanket, but crew said they didnt have anything and would turn the heat up, that didn't happen, so for 6 hours I remained cold.

Flight from New Orleans to Seattle to Anchorage was delayed for 3 hours My flight from Seattle to Anchorage was not rescheduled. I had to call the airlines to tell them to get a flight from Seattle to Anchorage they finally got me a flight If I hadn’t been aware of this problem I don’t know how long I would of waited in Seattle to get a flight to Anchorage!!!!!! Return trip from Anchorage to New Orleans in Seattle to New Orleans I was at the right gate when I realized something was wrong they had changed the gate without notifying the change l finally made it on time with minutes to spare & exhausted

I was at risk of not getting on the flight, as when I presented my boarding pass at the gate, it showed me as not having checked in. I was sent to the desk as the last of the other passengers boarded. The agent there said he could see that I had done all of my part and allowed times recommended, but it showed me as not checked in and he couldn't figure out how to correct it. He actually asked them to hold the flight as he struggled with it. He called for support, someone corrected it, and he printed boarding passes for both flights to reduce further issues. I did get on, and needed to ask someone to exit my seat.

Same crew flew with us from Palm Springs to Bellingham, so they were great! Friendly and kind from start to finish. Great experience!

Very late arrival at PWM. Late jet getting to ATL. Equipment problem with aircraft - could not get enough water onto plane., Another delay getting FAA approval for flight with bottled H2O. Not the crew’s problem.

Everything was fine except the entertainment was not working for half of the flight.

Easy boarding with an extremely kind attendant. Seats were spacious and we had 3 seats for 2 people so we could stretch out. Comfortable air flow and very attentive and hospital attendants. Bathrooms and food were the only negative. Bathrooms were so small you could hardly get in and close the door. I don’t think an obese person would fit or a person with a movement disability. Food was the trending food for flights, nonexistent. We spent $40 getting sandwich and snack at airport for our 6 hour flught.

At first, we were on the runway for about an hour, literally. The Captain did explain that the Control Tower just had a change shift (sounds like an unrealistic excuse) and then that we had to change a runway. A regular economy seat is made for 12 yo twiggy. I understand Delta wants to push for an upgrade, but after sitting in a Comfort seat and in First class. I would say First class is not worthy of my money. The landing was delayed because of the weather in NYC, I don't hold that against Delta, of course. The Captain did alert us to that upon takeoff in Vegas and again as we reached NY.

No one fussed at me about my pap machine as a 3rd pice on the plane. Boarding was pleasant and smooth. The boarding agent in Anchorage was a fun character- he could be in a movie. :~) The on-board crew were downright pleasant. No militant attitudes on Delta. Like all planes these days the seats are too narrow for standard Americans and at 5’2” there is barely enough leg room. I don’t know how tall people fold themselves into the seats. But that’s nothing specific to Delta

My husband upgraded our seats and I don't know if it was due to the type of planet was or if they didn't upgrade our seats. We were supposed to be in I believe comfort seats and they were just as tight as any other seat- no leg room and we are very tall people but at least it wasn't extremely cold. My husband did put in a complaint about our seating because he paid extra and if we would have known that the space and the tightness would have been the same, we just would have gotten the emergency row emergency row seats that we normally get. We love Delta but both our flights coming home we're not good. Oh I forgot to mention that on our flight to Hawaii our luggage wheels got broke and we had to purse new luggage on vacation then we never had this problem so we didn't know protocol and reported it after we got home only for them to tell is we only had 24hrs to report the damage. Not sure what was going on with Delta this vacation trip.

My flight was extremely cold. I had a jacket and a cover was left in each seat. The cover was extremely thin and I have a disability, fibromyalgia and arthrithis and AC air is the worst. I closed my vent and my husbands vent and it still was frigid. I asked the attendant if I could get another cover and she quickly almost dismissively and totally unconcerned stating, (I quote) (one per chair) and walked off so quickly that I didn't get a chance to explain to her that I literally have adisability. I didnt want to make a seen so I set on that flight for over 5 hours in pain, joints locking up and extremely uncomfortable. When my fibromyalgia flares up my joints not only ache but they will lock up also and it takes me days to get back to my regular self even though I take medication for it. I felt like it would not have hurt anyone at all for her to just give me an extra cover because I'm sure they have all types of medical issues in people that fly every day.

After all the weather issues at least they got me to my destination the next day

My flight was canceled after being rescheduled for four days canceling my trip. Kayak and everyone affiliated with it I.e the airlines, and just fly have been excruciating to deal with. My trip to visit family had to be canceled as there was no way to make it. I am furious at all of you.

They delayed our flight because of bad weather in NY which was completely understandable. Then they cancelled our flight and a later flight that evening. The earliest we could fly was the next morning. We ended up buying last minute tickets on another airline and made it home slightly delayed but safely that evening. Delta kept saying it was weather related but if that was the case how did we make it back on another airline? The weather in NY was cloudy but not bad.

Really disappointed with in flight entertainment, 6 hr flight with no built in screens

I was put in a middle seat with the people on either side of me kept passing their grandchild over me and talking back and forth while I was trying to rest or watch a movie. So inconsiderate and totally disturbing. I asked if they would sit next to each other to alleviate the constant impeding my comfort but they refused.

The flight crew were great. Very helpful and friendly. Seats comfy. Thanks

Overall it was a good flight, but the food should be looked at. No options. The seat was also uncomfortable and very tight.

Late boarding, full flight. Absolutely no food and barely a bag of pretzels. No video screens and slim pickings of movies. No live tv and poor selection of shows.

It’s great, I’ve always fly & ride with Hawaiian Airlines going Inter island or to the mainland.

Flight delays - issues with delays waiting for a gate in Denver

Pre-Flight check-in Staff did a terrific job correcting a seat mis-assignment problem after I checked in the night before my flight. They really stepped up to make my flight home a joy. It was also my birthday, so the flight crew made me feel special a little treat.

Our flight delayed 2 hours, no WiFi in flight and the snack option isn’t great either.

I was unable to get a check im and get a boarding pass. I tried at the desk of the flight operator Alaska, was told to go to Hawaiian and almost had to go back to Alaskan. In the end inwas told to go thru security and directly to the gate without checking in. It would have been more helpful to have the details rather than walking all over the terminals trying to check in.

Book cheap flights from Idaho to Washington

Recent round-trip flight deals

10/15Wed
1 stopSouthwest
7h 10mBOI-SEA
10/18Sat
1 stopSouthwest
6h 35mSEA-BOI
$101
8/19Tue
1 stopSouthwest
7h 25mBOI-GEG
8/20Wed
1 stopSouthwest
5h 20mGEG-BOI
$101
8/23Sat
nonstopHawaiian Airlines
1h 38mBOI-SEA
8/30Sat
nonstopHawaiian Airlines
1h 25mSEA-BOI
$112
8/23Sat
nonstopHawaiian Airlines
1h 12mBOI-GEG
8/30Sat
nonstopHawaiian Airlines
1h 09mGEG-BOI
$112
8/8Fri
nonstopAllegiant Air
1h 37mIDA-PDX
8/11Mon
nonstopAllegiant Air
1h 36mPDX-IDA
$114
8/1Fri
nonstopAllegiant Air
1h 37mIDA-PDX
8/11Mon
nonstopAllegiant Air
1h 36mPDX-IDA
$115
9/2Tue
nonstopAlaska Airlines
1h 19mBOI-PDX
9/10Wed
nonstopAlaska Airlines
1h 20mPDX-BOI
$117
10/18Sat
nonstopAlaska Airlines
1h 07mBOI-GEG
10/21Tue
nonstopAlaska Airlines
1h 12mGEG-BOI
$117
9/9Tue
nonstopDelta
1h 41mBOI-SEA
9/17Wed
nonstopDelta
1h 40mSEA-BOI
$117
8/23Sat
nonstopDelta
1h 40mBOI-SEA
8/25Mon
nonstopDelta
1h 36mSEA-BOI
$137

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Recent one-way flight deals

10/8Wed
1 stopSouthwest
5h 05mBOI-SEA
$51
10/8Wed
2 stopsSouthwest
8h 10mBOI-SEA
$56
12/17Wed
1 stopSouthwest
6h 15mBOI-SEA
$67
7/21Mon
nonstopAllegiant Air
1h 37mIDA-PDX
$78
10/14Tue
nonstopAlaska Airlines
1h 07mBOI-GEG
$79
9/9Tue
nonstopDelta
1h 42mBOI-SEA
$79
8/23Sat
1 stopHawaiian Airlines
3h 58mBOI-SEA
$82
8/23Sat
nonstopAlaska Airlines
1h 12mGEG-SEA
$84
8/23Sat
nonstopHawaiian Airlines
1h 16mGEG-SEA
$88
8/12Tue
nonstopDelta
1h 20mGEG-SEA
$89

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Last minute flights from Idaho to Washington

Last minute flight, train and bus deals

7/11Fri
nonstopAllegiant Air
1h 37mIDA-PDX
7/14Mon
nonstopAllegiant Air
1h 36mPDX-IDA
$139
7/14Mon
nonstop
1h 37mIDA-PDX
7/17Thu
multi-stop
26h 23mPDX-IDA
$278
7/14Mon
nonstopAllegiant Air
1h 37mIDA-PDX
7/17Thu
multi-stopAllegiant Air
24h 10mPDX-IDA
$326
7/14Mon
nonstopHawaiian Airlines
1h 21mBOI-PDX
7/21Mon
nonstopHawaiian Airlines
1h 14mPDX-BOI
$342
7/13Sun
nonstopAlaska Airlines
1h 15mGEG-SEA
7/30Wed
nonstopAlaska Airlines
1h 01mSEA-GEG
$357
7/14Mon
multi-stopSpirit Airlines
14h 30mBOI-PDX
7/21Mon
multi-stopSpirit Airlines
7h 29mPDX-BOI
$363
7/13Sun
nonstopAlaska Airlines
1h 14mGEG-SEA
7/30Wed
multi-stopAlaska Airlines
2h 46mSEA-GEG
$367
7/13Sun
multi-stopHawaiian Airlines
3h 20mGEG-SEA
7/30Wed
multi-stopHawaiian Airlines
4h 37mSEA-GEG
$376
7/15Tue
nonstopDelta
1h 22mGEG-SEA
7/18Fri
nonstopDelta
1h 14mSEA-GEG
$427
7/13Sun
nonstopDelta
1h 24mGEG-SEA
7/20Sun
nonstopDelta
1h 14mSEA-GEG
$432

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Everything you need to know for your flight to Washington

Cabin class types available on flights to Idaho

Cabin classes available on flights to Idaho. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.

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