Well, the economy lot at the airport itself is 10.00/day.

Then there are off site lots (some at airport hotels) with 24/7 shuttle service,

https://www.way.com/parkingdetails/4884445/Park-and-Travel-Washington-Dulles-Airport-(IAD)-Parking

Depending on your dates and flight times, there's also the option of staying a night at an airport hotel at the beginning or end of your trip and add parking for the whole 17 days. For the Aloft, that's about 180.00 incl. one night stay and parking for 17 days.

https://dulles.parksleepfly.com

Not knowing the particulars of your situation, it might make better sense to use a car service instead (reason being that after sitting idle for 17 days, you might return to a car with a dead battery and/or significantly underinflated tires, neither of which is fun to deal with when it happens in the comfort of your own garage, let alone at an airport parking lot!)

Thanks nosoccermom!

We cannot stay in a hotel, my husband is working half day on the Wednesday we leave and then driving to DC after work for a 10:25 PM flight. And Sammy, we're around 2 hours from the airport so a car service is out.

I have used this to find airport parking, including in DC, numerous times with no problem.

https://www.airportparkingreservations.com/

I remember returning to my car after a long trip and holding my breath when I turned the key, lol. Heck, I was a bit anxious after every short business trip. (That's just me.....my cars never failed me.)

Oh well! Sorry the car service route isn’t an option for you. But, hey—at least you and anyone else who might read this know (if you didn’t already) about using that option in the future, if for no other reason than to avoid the dreaded dead battery scenario, which actually happened to my friend several years ago, when her flight got in late in the evening...in the wintertime...in Pittsburgh. :/

You may be able to find a groupon for a discount at the long term parking. I have found them for BWI in the past.

Parking at Dulles is not fun(nothing else is either) but you can park in the economy lot and the shuttle bus picks you up and takes you to your airline and on coming home, the reverse. We've parked for 2 weeks there and never had a problem with the car. One thing to remember is that you pay for parking in the terminal before you get on the shuttle. Dulles parking is much different than BWI. Don't forget to account for rush hour on the Beltway.

We frequently park at Dulles economy blue lot. Park near the shuttle stop 10 (last one). Then, when you come back, get off at stop 1, cross the road and you're where you parked. Saves you touring the whole lot on the shuttle.

Thanks guys! Sending all this info to my husband and he's looking into all these options!

Even though you can’t stay in the hotel the night before your flight, the hotel parking deal ,ay still work. Your flight is at 10 pm. Check into the hotel at 6 pm go to flight. You don’t have to sleep in the room

it's cheaper to just pay parking, though.

DH says take the car into a nearby dealer for service.

Beagles, which parking option did you use and would you recommend it? I’ll be traveling from Dulles in September and again in October. I’m close enough to use a car service but thought I’d compare options. Thanks!

The Crowne Plaza hotel. It was $4.95/day and we booked through way.com as nosoccermom suggested. We'd recommend it. The only small downside is that the shuttles to take you to the parking come, I think it was every 15 minutes or every 1/2 hour, I can't remember -- but our timing worked out well so we didn't have to wait.

So, you did also stay overnight at the Crowne Plaza?

No we didn't stay overnight. We were just able to book the parking through the link and pay the $4.95 daily.

Thank you!

Wow, that's a great deal. Need to keep my own advice in mind for future travel.