Route guide · 419 miles
Cheap Flights from Washington to Knoxville
IAD → TYS · Nonstop 1h 21m · Live round-trip fares
Looking for cheap flights from Washington to Knoxville? You're in the right place. Airfare Deal tracks live fares on this 419-mile route around the clock. As a rule of thumb, booking 2–4 weeks ahead lands the best prices — and a free fare alert means you never have to keep refreshing the page.
Live fares for IAD → TYS are updating. Use the search below for real-time prices.
Search live pricesCheapest recent fare
See live fares
Updated daily
Flight time
1h 21m
Nonstop, typical
Distance
419 mi
IAD → TYS
Book ahead
2–4 weeks
Best window, typically
Nonstop airlines
1
United Airlines
Nonstop flights from Washington to Knoxville
Nonstop flights from Washington to Knoxville are flown by United Airlines. The 419-mile trip takes about 1h 21m gate to gate, and nonstops are usually cheapest when booked 2–4 weeks ahead.
Booking insights: Washington → Knoxville
- Distance: 419 miles · nonstop flight time: 1h 21m.
- Cheapest upcoming week in the live data starts around Oct 22, with fares from $35.
- Fares tend to bottom out when you book about 2–4 weeks ahead — earlier than that rarely helps, later usually hurts.
- Midweek departures (Tue–Thu) are consistently cheaper than weekend flights.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
Price trend
Cheapest departure weeks ahead
Departing around Oct 22 is currently the cheapest window — about $189 less than the nearest weeks. Based on recent fares found for this route; prices change quickly.
Cheapest month · Washington → Knoxville
October 2026
Every date's recent round-trip fare, at a glance.
Fares from
$35
Cheapest: Thu, Oct 22 — $35 · Priciest: Oct 19 — $224
Get this fare →Recent fares found for specific dates in October 2026. Blank days had no recent fare in our data — ask our team and we'll check them for you.
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Flying from Washington to Knoxville: what you need to know
The flight
At 419 miles, IAD to TYS is one of those quick up-and-down flights: roughly 1h 21m nonstop. There's no meal service to plan around — the decisions that matter here are departure time and which airport entrance traffic is kinder to you.
Airlines on this route
United Airlines flies this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from Washington (IAD)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our Washington airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Knoxville (TYS)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The Knoxville airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Knoxville to Washington fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 419 miles, booking 2–4 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
- Flexible dates? Search a few days either side — one day can change the fare a lot.
- Morning flights are delayed less often than evening ones — earlier departures have the best on-time record.
- Basic economy fares often exclude checked bags and seat selection. Price the whole trip, not the headline fare.
- Get to the airport two hours before departure; security, not the flight, is the part that runs late.
Washington to Knoxville flight FAQs
How long is the flight from IAD to TYS?
Nonstop flights from Washington to Knoxville take about 1h 21m and cover roughly 419 miles. One-stop itineraries add 2–4 hours depending on the layover city.
Are there nonstop flights from Washington to Knoxville?
United Airlines typically operate nonstop flights from IAD to TYS. Nonstops are usually cheapest when booked 2–4 weeks ahead of departure.
What is the cheapest month to fly from Washington to Knoxville?
There's no single magic month, but prices on this route generally soften in the shoulder season, when demand dips after the holidays and again in early fall. A free fare alert is the easiest way to catch those windows.
How much are last minute flights from IAD to TYS?
Last-minute flights from IAD to TYS (booked within 7 days of departure) typically cost noticeably more than fares booked 2–4 weeks out. Booking early is the smarter move.
What is a good round-trip deal from Washington to Knoxville?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from Washington to Knoxville?
You'll mainly see United Airlines on Washington to Knoxville. Checking each against the live fares below is the surest way to find the lowest price for your dates.
How early should I get to Washington airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
More cheap flights from Washington
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