Cheap flights from Boulder to Arlington from CA $133

View CA $133 flight on Sat, Sep. 6, 2025Opens in a new window

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Cheap flights from Boulder (DEN) to Arlington (WAS)

Prices were available within the past 7 days and start at CA $133 for one-way flights and CA $282 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Tue, Oct. 21 - Fri, Oct. 24
DEN
Denver
DCA
Washington
CA $282 Roundtrip, found 3 days ago
CA $282
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct. 21 from Denver to Washington, returning Fri, Oct. 24, priced at CA $282 found 3 days ago
American Airlines
Tue, Sep. 16 - Sun, Sep. 21
DEN
Denver
DCA
Washington
CA $285 Roundtrip, found 5 days ago
CA $285
Roundtrip
found 5 days ago
Select American Airlines flight, departing Tue, Sep. 16 from Denver to Washington, returning Sun, Sep. 21, priced at CA $285 found 5 days ago
Delta
Sat, Aug. 16 - Sat, Aug. 23
DEN
Denver
IAD
Washington
CA $300 Roundtrip, found 5 days ago
CA $300
Roundtrip
found 5 days ago
Select Delta flight, departing Sat, Aug. 16 from Denver to Washington, returning Sat, Aug. 23, priced at CA $300 found 5 days ago
American Airlines
Tue, Oct. 21 - Fri, Oct. 24
DEN
Denver
DCA
Washington
CA $309 Roundtrip, found 3 days ago
CA $309
Roundtrip
found 3 days ago
Select American Airlines flight, departing Tue, Oct. 21 from Denver to Washington, returning Fri, Oct. 24, priced at CA $309 found 3 days ago
Delta
Tue, Oct. 21 - Fri, Oct. 24
DEN
Denver
DCA
Washington
CA $314 Roundtrip, found 3 days ago
CA $314
Roundtrip
found 3 days ago
Select Delta flight, departing Tue, Oct. 21 from Denver to Washington, returning Fri, Oct. 24, priced at CA $314 found 3 days ago
JetBlue Airways
Tue, Oct. 21 - Fri, Oct. 24
DEN
Denver
DCA
Washington
CA $322 Roundtrip, found 3 days ago
CA $322
Roundtrip
found 3 days ago
Select JetBlue Airways flight, departing Tue, Oct. 21 from Denver to Washington, returning Fri, Oct. 24, priced at CA $322 found 3 days ago

Find the cheapest month to fly from Denver (DEN) to Washington (DCA)

September is typically the cheapest month to fly

From CA $100 - CA $265 per traveller.

Graph displaying average flight prices per month

*Available to Expedia members.