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Find cheap flights from Illinois to Reagan Washington National Airport from $80

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Reagan-National departing on 5/21. 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.
1 adult
0 bags
Wed 5/29
Wed 6/5

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In the last 7 days travelers have searched 43,983,279 times on KAYAK, and here is why:

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Good to know

Low season

January

High season

March

Cheapest flight

$80
Best time to beat the crowds with an average 8% drop in price.
Most popular time to fly with an average 4% increase in price.
Flight from St. Louis to Reagan Washington National Airport

FAQs for booking Illinois to Reagan Washington National Airport flights

  • How does KAYAK find such low prices on flights from Illinois to Reagan Washington National Airport?

    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 Illinois to Reagan Washington National Airport.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Reagan Washington National Airport from Illinois 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 Illinois to Reagan Washington National Airport?

    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 to Reagan Washington National Airport with an airline and back to Illinois with another airline.

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

    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 to Reagan Washington National Airport from Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Prefer to fly non-stop from Illinois to Reagan Washington National Airport?

Find which airlines fly direct from Illinois to Reagan-National, which days they fly and book direct flights.

Nonstop departures

Illinois to Washington, D.C. Reagan-National

Monday

ANA, Aerolineas Argentinas, Aeromexico, +41 more

ANA, Aerolineas Argentinas, +42 more

Tuesday

ANA, Aerolineas Argentinas, Aeromexico, +41 more

ANA, Aerolineas Argentinas, +42 more

Wednesday

ANA, Aerolineas Argentinas, Aeromexico, +41 more

ANA, Aerolineas Argentinas, +42 more

Thursday

ANA, Aerolineas Argentinas, Aeromexico, +40 more

ANA, Aerolineas Argentinas, +41 more

Friday

ANA, Aerolineas Argentinas, Aeromexico, +41 more

ANA, Aerolineas Argentinas, +42 more

Saturday

ANA, Aerolineas Argentinas, Aeromexico, +40 more

ANA, Aerolineas Argentinas, +41 more

Sunday

ANA, Aerolineas Argentinas, Aeromexico, +42 more

ANA, Aerolineas Argentinas, +43 more

See more direct flights

Nonstop returns

Washington, D.C. Reagan-National to Illinois

Monday

ANA, Aerolineas Argentinas, Aeromexico, +41 more

ANA, Aerolineas Argentinas, +42 more

Tuesday

ANA, Aerolineas Argentinas, Aeromexico, +41 more

ANA, Aerolineas Argentinas, +42 more

Wednesday

ANA, Aerolineas Argentinas, Aeromexico, +41 more

ANA, Aerolineas Argentinas, +42 more

Thursday

ANA, Aerolineas Argentinas, Aeromexico, +40 more

ANA, Aerolineas Argentinas, +41 more

Friday

ANA, Aerolineas Argentinas, Aeromexico, +41 more

ANA, Aerolineas Argentinas, +42 more

Saturday

ANA, Aerolineas Argentinas, Aeromexico, +40 more

ANA, Aerolineas Argentinas, +41 more

Sunday

ANA, Aerolineas Argentinas, Aeromexico, +42 more

ANA, Aerolineas Argentinas, +43 more

See more direct flights
See more direct flights

Book cheap flights from Illinois to Washington, D.C.

Recent round-trip flight deals

5/28Tue
nonstopAmerican Airlines
1h 56mSTL-DCA
6/4Tue
nonstopAmerican Airlines
2h 16mDCA-STL
$159
5/22Wed
nonstopAmerican Airlines
1h 47mORD-DCA
5/28Tue
nonstopAmerican Airlines
2h 15mDCA-ORD
$159
5/30Thu
nonstopUnited Airlines
1h 59mORD-DCA
6/4Tue
nonstopUnited Airlines
2h 13mDCA-ORD
$174
7/1Mon
1 stopDelta
6h 21mSTL-DCA
7/5Fri
1 stopDelta
6h 44mDCA-STL
$178
6/4Tue
1 stopDelta
6h 45mORD-DCA
6/11Tue
1 stopDelta
4h 39mDCA-ORD
$178
6/12Wed
1 stopDelta
5h 15mMDW-DCA
6/18Tue
1 stopDelta
3h 43mDCA-MDW
$178
5/30Thu
1 stopUnited Airlines
4h 58mORD-DCA
6/4Tue
nonstopUnited Airlines
2h 12mDCA-ORD
$183
5/29Wed
1 stopFrontier
14h 59mSTL-DCA
6/5Wed
1 stopFrontier
20h 33mDCA-STL
$224
5/23Thu
1 stopFrontier
21h 53mSTL-DCA
5/25Sat
1 stopFrontier
28h 35mDCA-STL
$226
6/3Mon
1 stopSouthwest
6h 25mORD-DCA
6/5Wed
2 stopsSouthwest
10h 05mDCA-ORD
$291

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Recent one-way flight deals

5/21Tue
nonstopAmerican Airlines
1h 56mSTL-DCA
$80
7/30Tue
nonstopAmerican Airlines
1h 54mORD-DCA
$80
5/21Tue
1 stopDelta
6h 39mSTL-DCA
$89
5/29Wed
1 stopDelta
4h 58mORD-DCA
$89
8/21Wed
1 stopJetBlue
5h 06mORD-DCA
$92
5/25Sat
nonstopUnited Airlines
1h 59mORD-DCA
$95
10/5Sat
1 stopUnited Airlines
4h 09mSTL-DCA
$100
5/21Tue
1 stopFrontier
12h 19mSTL-DCA
$119
9/17Tue
1 stopFrontier
9h 09mORD-DCA
$123
6/18Tue
1 stopJetBlue
5h 15mORD-DCA
$127

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Last minute flights from Illinois to Reagan-National

Last minute flight, train and bus deals

5/1Wed
nonstopAmerican Airlines
1h 48mORD-DCA
5/1Wed
multi-stopAmerican Airlines
4h 44mDCA-ORD
$275
5/4Sat
multi-stopFrontier
14h 56mSTL-DCA
5/11Sat
multi-stopFrontier
26h 39mDCA-STL
$277
5/4Sat
multi-stopFrontier
14h 56mSTL-DCA
5/6Mon
multi-stopFrontier
28h 00mDCA-STL
$278
5/4Sat
multi-stopUnited Airlines
4h 54mPIA-DCA
5/22Wed
multi-stopUnited Airlines
5h 26mDCA-PIA
$289
5/1Wed
multi-stopUnited Airlines
6h 00mMLI-DCA
5/5Sun
multi-stopUnited Airlines
4h 23mDCA-MLI
$296
5/4Sat
multi-stopUnited Airlines
4h 54mPIA-DCA
5/18Sat
multi-stopUnited Airlines
5h 26mDCA-PIA
$296
5/3Fri
multi-stopDelta
4h 27mORD-DCA
5/15Wed
multi-stopDelta
4h 10mDCA-ORD
$444
5/3Fri
multi-stopDelta
4h 01mMDW-DCA
5/15Wed
multi-stopDelta
5h 11mDCA-MDW
$444
5/4Sat
multi-stopJetBlue
5h 13mORD-DCA
5/7Tue
multi-stopJetBlue
7h 00mDCA-ORD
$465
4/30Tue
multi-stopJetBlue
4h 48mORD-DCA
5/2Thu
multi-stopJetBlue
7h 23mDCA-ORD
$580

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