$122 Find Cheap Flights from Washington, D.C. to Idaho - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Washington, D.C. to Idaho departing on 8/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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Cheap Flights from Washington, D.C. to Idaho

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Boise
Boise1 stop$240
Hailey
Hailey1 stop$429
Lewiston
Lewiston1 stop$590
Twin Falls
Twin Falls1 stop$424
Pocatello
Pocatello2 stops$949
Spokane
Spokane1 stop$314
Boise
Boise1 stop$240
Hailey
Hailey1 stop$429
Lewiston
Lewiston1 stop$590
Twin Falls
Twin Falls1 stop$424
Pocatello
Pocatello2 stops$949
Spokane
Spokane1 stop$314

Book Cheap Washington, D.C. to Idaho Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington, D.C. to Idaho that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Washington, D.C. to Idaho

Tue, Aug 18 - Tue, Aug 25
Frontier Logo
7:00 am - 12:29 pm
DCA
-
BOI
7h 29m
1 stop
Frontier Logo
1:24 pm - 9:59 pm
BOI
-
DCA
6h 35m
1 stop
$240Frontier
Wed, Aug 26 - Fri, Sep 11
Frontier Logo
8:59 am - 11:29 am
IAD
-
BOI
28h 30m
2 stops
Frontier Logo
2:50 pm - 6:20 am
BOI
-
IAD
13h 30m
1 stop
$267Frontier
Sat, Aug 22 - Wed, Aug 26
Delta Logo
6:00 am - 1:42 pm
IAD
-
BOI
9h 42m
1 stop
Delta Logo
12:23 pm - 11:59 pm
BOI
-
IAD
9h 36m
1 stop
$303Delta
Wed, Aug 26 - Fri, Sep 11
Delta Logo
6:00 am - 1:42 pm
IAD
-
BOI
9h 42m
1 stop
Delta Logo
2:50 pm - 11:23 pm
BOI
-
IAD
6h 33m
1 stop
$303Delta
Mon, Aug 31 - Wed, Sep 9
United Airlines Logo
5:15 pm - 10:53 pm
IAD
-
BOI
7h 38m
1 stop
United Airlines Logo
5:00 am - 1:29 pm
BOI
-
IAD
6h 29m
1 stop
$303United Airlines
Sat, Oct 31 - Sat, Nov 7
United Airlines Logo
3:35 pm - 10:51 pm
IAD
-
BOI
9h 16m
1 stop
United Airlines Logo
2:51 pm - 11:15 pm
BOI
-
IAD
6h 24m
1 stop
$303United Airlines
Wed, Aug 26 - Wed, Sep 2
Southwest Logo
6:30 am - 10:55 am
BWI
-
BOI
6h 25m
1 stop
Southwest Logo
6:00 am - 4:30 pm
BOI
-
BWI
8h 30m
1 stop
$303Southwest
Mon, Jan 25 - Wed, Jan 27
Southwest Logo
10:15 am - 4:05 pm
BWI
-
BOI
7h 50m
1 stop
Southwest Logo
7:40 am - 7:15 pm
BOI
-
BWI
9h 35m
1 stop
$303Southwest
Tue, Sep 15 - Tue, Sep 22
Alaska Airlines Logo
7:50 am - 8:20 pm
BWI
-
BOI
14h 30m
2 stops
Alaska Airlines Logo
1:31 pm - 3:40 pm
BOI
-
BWI
24h 09m
1 stop
$303Alaska Airlines
Wed, Sep 9 - Thu, Sep 17
Alaska Airlines Logo
4:43 pm - 11:55 pm
BWI
-
BOI
9h 12m
1 stop
Alaska Airlines Logo
5:52 pm - 6:30 am
BOI
-
BWI
10h 38m
1 stop
$303Alaska Airlines
Booking Insights

KAYAK's insights & trends for Washington, D.C. to Idaho flights

Get data-powered insights and trends into flights from Washington, D.C. to Idaho to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Washington, D.C. to Idaho?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Washington, D.C. to Idaho departing in August.

Flight prices are below average for this route right now.

Flights to Idaho from Washington, D.C. usually cost between $297 and $465 in August.
The lowest price found in the past 5 days was $240 on Frontier (Aug 18-Aug 25).

What is the cheapest Washington, D.C. to Idaho flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Idaho from Washington, D.C. found in the last 5 days was to Idaho Falls, at $447 round-trip. The most popular route is from Washington, D.C. Dulles Intl Airport (IAD) to Idaho Falls (IDA), and the cheapest round-trip airline ticket found on this route in the last 5 days was $447.

What is the cheapest month to fly from Washington, D.C. to Idaho?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Washington, D.C. to Idaho, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Washington, D.C. to Idaho is May, when tickets cost $389 (return) on average. On the other hand, the most expensive months are December and March, when the average cost of round-trip tickets is $586 and $578 respectively.

Good to know

Low season

January

Cheapest flight

$122
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly with an average 5% increase in price.
Flight from Reagan Washington National Airport to Boise

FAQs - booking Idaho flights

  • How does KAYAK find such low prices on flights from Washington, D.C. to Idaho?

    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 Washington, D.C. to Idaho.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Washington, D.C. to Idaho 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 Washington, D.C. to Idaho?

    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 Washington, D.C. to Idaho 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 Washington, D.C. to Idaho?

    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 Washington, D.C. to Idaho up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Washington, D.C. to Idaho

 
See real verified KAYAK customer reviews for airlines flying from Washington, D.C. to Idaho. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Washington, D.C. to Idaho? 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
SouthwestOverall score based on 4229 reviews
8.0Comfort
8.1Boarding
7.5Entertainment
7.0Food
8.6Crew
Airline reviews

The flight was delayed due to earlier issues at other airports. The crew was excellent & made it a good trip.

6.0 GoodJeremy, Aug 2026
STL - PHL
Read more Southwest reviews

The flight was delayed due to earlier issues at other airports. The crew was excellent & made it a good trip.

Boarding process of asking for volunteers to check bags goes against the system you had before with 2 bags checked free. This process is more of a guilt trip than a caring attitude toward the customer. In addition bag-size scrutiny has increased which also slows down the process of boarding. My wife said she will not fly on your airline again unless there is no other option.

Eveeyrime I fly they are begging for bags due to cabin overhead space. What they should so ia take the bags that are clearly too big to fit wheels first on their side. And those of us who give up the bag should really get their bags first. When boarding, nobody wants stupid jokes about how hot it is on board. Give us some cool air. Im usually sick from the heat by the time we take off.

No wifi, seems to be very common with Southwest currently. Everything else was normal.

Poor customer service, no accommodation for passengers when the flight was delayed over 5 hours.

Haven’t flown on SW in years. Flight was on time departing and arriving. Served vegan butter onion flavored pretzels which were bad. Coke served was in a tiny paper cup. Crew was not engaging. Felt like they were going through the motions. Old plane, tight seats and no leg room.

No delays and arrived to destination 30 min early. Staff was super friendly.

Pretty standard flight. We left late, but arrived early. The wifi entertainment is always nice. The free snacks and beverages are simple, but appreciated. I'm tall and the seats are an issue. I can deal with a short flight, but any longer, I have to find another airline where I know beforehand I have extra legroom.

Awesome experience. No in-flight video or meal. Still do not like the boarding process.

On time, good crew, easy flight. Just like the old days!

On time departure & early arrival made the long day much better

Alaska has been my favorite airline for years, so this last trip came as a shock and disappointment. The seats on the plane were so uncomfortable and seemingly cheap. The person sitting next to me said the same thing. I used to love the in cabin lighting, the purple was so relaxing, it's now gone. The little touches that made Alaska great are gone. I purchased the wifi and it wasn't working during much of the flight, the flight attendants kept rebooting it. I wouldn't have spent my money that way had I known it would be unusable for 50% of the flight. I am bummed because I always chose Alaska over price shopping. I have an upcoming flight back to DC and decided to go with American Airlines. It was a better price and I don't feel like Alaska gives me anything special.

The agents were super helpful. I was traveling with my mother inlaw who needed whell chair assisstance. The help and accomodation from the checkin crew, to the boarding crew and inflight crew was excellent.

It departed an hour and a half late because the crew got in late the previous night due to weather related problems. So we got into LA later than anticipated and traffic was much worse.

Good. I didn’t order food and there was no entertainment available.

It was not a good experience, the flight was delayed 3 hours, the gate staff were super pushy to get bags checked claiming it was a full flight, there were about a dozen open seats from what I could tell. The intercom from the pilot seemed to be broken, it sounded like the pilot was speaking with a mouth full of marbles.

The food was terrible, worse that what you get with UA, an already one of the lowest standards to beat. How cheap one could be, providing that kind of junk food in first class. Unbelievable! The seats were not very comfortable either. And there were no screens either, not that I cared much but for you to know.

The aircraft was extremely warm the entire flight. After we landed we were stuck on the plane for another 45 minutes without a gate to deboard from. The smell of exhaust from the engines in the cabin along with the heat inside the cabin made the flight uncomfortable.

Flight cancelled and deplaned. Rescheduled 8 hours later at a different airport. Ended up at destination but late.

The seats are very small. I’m 5’ 3”, so don’t think I should notice. The food selection was non existent and very disappointing. 5 hour flight plus TSA, etc. I would have appreciated a small salad, crudités. Something fresher not just chips.

Flight was delayed for about an hour but overall good experience

I missed the flight because the Minneapolis flight was 49 minutes LATE, and the Boise flight LEFT 24 minutes EARLY!

The gentleman at the gate I think his name is RIE was exceptional

This flight was no comparison to our prior flight. I'm thinking it all has to do with the age of the aircraft.

2 of the seats in row 31 the entertainment system was not working, and one seat the tray table did not go all the way down. Flight arrived early and departed on time which was great.

Waited at the usual crowded gate at DCA where one ends up standing up because there aren't enough seats.

Delayed take-off. Very small plane so very scary with lots of bumps during the flight. Would never fly Delta on short flights in small 80 seaters plane again! Felt relieved when landed.

Inexpensive, got an exit row aisle aeat with no middle passenger, bought a great breakfast sandwich, flight comfortable & arrived ahead of schedule.

I wouldn't say I liked being forced to check my small roller bag at the gate; too many people had bags and were in a higher boarding group.

715PM departure was 2.5 hours late. Received hotel & food voucher but after we already booked a room. Entire team just seemed like they were 2-3 steps behind in execution, and notifcations.

My flight was delayed so bad i missed u it so i just said never mind

Delayed 2 hours while stuck on the aircraft. If the luggage was properly loaded the first time we probably wouldn’t have been delayed at all

Onboard staff was courteous, helpful, responsive and friendly. The boarding process was disorganized, poorly communicated, and disheveled. Gate agents were yelling instead of using the PA system, didn’t communicate the timing delay of our flight, and created an atmosphere of chaos rather than order and communication. As far as I know, there was no reason for their. I would hate to see how it operated under extreme conditions. I’ve never seen United Airlines operations in such a state.

The flight did not have its customary snacks during the flight. Apparently they were never loaded on the plane.

Like: departed and arrived on time. Unlike: Food options for purchase allways bad, 1 of 2 of the crew members not very friendly at all. Seats and leg room aweful. At this point I am thinking on switching to AA.

Over 5 hour delay with minimal updates or ability to standby for alternative flights. During boarding and 1 hr+ wait for takeoff, seats were drenched w water from air conditioning condensation and always leftover crumbs on carpet and seats

After arriving in Chicago, we were taxiing for 1.5 hours with infrequent and untruthful updates about the amount of time it would take to arrive at the gate. Minimally, the team could have provided timing expectations that were more truthful, especially one their original expectations were not met.

United didn’t even try to hold the flight for me. They knew I had a tight connection and when I arrived at the gate less than 10 mins after final boarding the flight had already gone. The gate agent wasn’t even notified that I was on my way. She was told I wasn’t at the airport

Good quick flight on a small but comfortable plane. I'm 6'3 and had plenty of space.

The flight was delayed so we were dead tired, and after that the turbulence was horrible. I was very scared.

Disorganized boarding. Mandatory to gate check bags. Curt flight staff. No space for cabin bag, even when I was in first class.

Patrons with larger bags were asked to check the bags when boarding. Seems like the most effective, and least costly way, way to successfully use the cramped space.

They cancelled our flight two times after rebooking us for a later flight. We never got on the plane. We found another solution by driving.

Mostly great. Only issue was with the WiFi. Halfway through the flight it was spotty and I was unable to work as I planned. This impacted my work products as I am traveling for business and it was an unexpected hindrance which was inconvenient. Flight here was amazing. For a 5 hour flight something more than a Biscoff would be nice but I’m just swinging at windmills I guess…

Delayed boarding because a flight attendant couldn't find the gate...sat on the plane for over an hour at the gate because AA couldn't get one of the planes behind us to move

The seats were extremely cramped, with very little legroom or personal space. There was no room left in the overhead bins for a backpack, and the space under the seat in front was so limited that I could barely fit my bag underneath. Overall, the seating arrangement felt very uncomfortable and overcrowded.

As always, most AA flights that we fly are almost ALWAYS delayed and that too multiple times. Very frustrating

The small flights with Valet Luggage has a poor service

Overall a good experience, however Wifi was not working on the flight.

THe flight was an hour late. You got us on the plan and we sat on the ground for 45 minutes with no information from the pilot whatsoever. Worst flight this year.

Everything you need to know for your flight from Washington, D.C. to Idaho

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.